0000000000116780

AUTHOR

Lidón Gil-escrig

0000-0003-4766-7833

showing 46 related works from this author

Efficient Vacuum Deposited P-I-N Perovskite Solar Cells by Front Contact Optimization.

2020

Hole transport layers HTLs are of fundamental importance in perovskite solar cells PSCs , as they must ensure an efficient and selective hole extraction, and ohmic charge transfer to the corresponding electrodes. In p i n solar cells, the ITO HTL is usually not ohmic, and an additional interlayer such as MoO3 is usually placed in between the two materials by vacuum sublimation. In this work, we evaluated the properties of the MoO3 TaTm TaTm is the HTL N4,N4,N4 amp; 8243;,N4 amp; 8243; tetra [1,1 amp; 8242; biphenyl] 4 yl [1,1 amp; 8242; 4 amp; 8242;,1 amp; 8243; terphenyl] 4,4 amp; 8243; diamine hole extraction interface by selectively annealing either MoO3 prior to the deposition of TaTm o…

FabricationMaterials scienceAnnealing (metallurgy)Perovskite solar cell02 engineering and technologyperovskite solar cell ; molybdenum oxide ; vacuum deposition ; processing ; hole transport layer010402 general chemistryhole transport layer01 natural sciencesmolybdenum oxidelcsh:ChemistryVacuum depositionWork functionOhmic contactMaterialsCèl·lules fotoelèctriquesOriginal Researchbusiness.industryGeneral Chemistryvacuum-deposition021001 nanoscience & nanotechnologyperovskite solar cell0104 chemical sciencesActive layerChemistrylcsh:QD1-999ElectrodeOptoelectronicsprocessing0210 nano-technologybusinessFrontiers in chemistry
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Dual-source vacuum deposition of pure and mixed halide 2D perovskites: thin film characterization and processing guidelines

2020

The dual-source vacuum deposition of 2D perovskite films of the type PEA2PbX4, (PEA = phenethylammonium and X = I−, Br−, or a combination of both) is presented. Low-temperature deposited 2D perovskite films showed high crystallinity with the expected trend of bandgap as a function of halide type and concentration. Importantly, we observed an unavoidable halide cross-contamination among different deposition runs, as well as a strong dependence of the material quality on the type of halide precursors used. These findings should be taken into account in the development of vacuum processing for low-dimensional mixed halide perovskites.

Materials scienceBand gapAnalytical chemistryHalide02 engineering and technologyGeneral Chemistry010402 general chemistry021001 nanoscience & nanotechnology01 natural sciences0104 chemical sciencesCharacterization (materials science)CrystallinityVacuum depositionSemiconductorsMaterials ChemistryDeposition (phase transition)Thin film0210 nano-technologyMaterialsPerovskite (structure)
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Perovskite/Perovskite Tandem Solar Cells in the Substrate Configuration with Potential for Bifacial Operation.

2022

Perovskite/perovskite tandem solar cells have recently exceeded the record power conversion efficiency (PCE) of single-junction perovskite solar cells. They are typically built in the superstrate configuration, in which the device is illuminated from the substrate side. This limits the fabrication of the solar cell to transparent substrates, typically glass coated with a transparent conductive oxide (TCO), and adds constraints because the first subcell that is deposited on the substrate must contain the wide-bandgap perovskite. However, devices in the substrate configuration could potentially be fabricated on a large variety of opaque and inexpensive substrates, such as plastic and metal fo…

General Chemical EngineeringBiomedical EngineeringGeneral Materials ScienceMaterialsCèl·lules fotoelèctriquesACS materials letters
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Vacuum deposited perovskite solar cells employing dopant-free triazatruxene as the hole transport material

2017

Abstract Planar perovskite solar cells using organic charge selective contacts were fabricated. In a vacuum deposited perovskite-based solar cell, dopant and additive free triazatruxene as the hole transport layer was introduced for device fabrication. High open-circuit voltage of 1090 mV was obtained using methylammonium lead iodide (Eg=1.55 eV) as light harvesting material, thus representing a loss of only 460 mV which is in close vicinity of mature silicon technology (400 mV). The devices showed a very competitive photovoltaic performance, monochromatic incident photon-to-electron conversion efficiency of 80% and the power conversion efficiencies in excess of 15% were measured with a neg…

Materials scienceFabricationDopantSiliconRenewable Energy Sustainability and the Environmentbusiness.industryEnergy conversion efficiencyPhotovoltaic systemchemistry.chemical_element02 engineering and technology010402 general chemistry021001 nanoscience & nanotechnology01 natural sciences0104 chemical sciencesSurfaces Coatings and FilmsElectronic Optical and Magnetic Materialslaw.inventionHysteresischemistrylawSolar cellOptoelectronics0210 nano-technologybusinessPerovskite (structure)Solar Energy Materials and Solar Cells
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Self-absorption in a light-emitting electrochemical cell based on an ionic transition metal complex

2015

We report on the quantitative and qualitative effects of self-absorption in light-emitting electrochemical cells (LECs) based on ionic transition metal complexes (iTMCs), as measured in-situ during electric driving. A yellow-emitting iTMC-LEC comprising an active material thickness of 95 nm suffers a 4% loss of the emission intensity to self-absorption, whereas the same type of device but with a larger active-material thickness of 1 mu m will lose a significant 40% of the light intensity. We also find that the LEC-specific effect of doping-induced self-absorption can result in a drift of the emission spectrum with time for iTMC-LECs, but note that the overall magnitude of doping-induced sel…

PhotoluminescenceMaterials sciencePhysics and Astronomy (miscellaneous)F300Inorganic chemistryDopingfungiIonic bondingF50002 engineering and technology010402 general chemistry021001 nanoscience & nanotechnology01 natural sciences0104 chemical sciencesElectrochemical cellTransition metalPhysical SciencesFysikSelf-absorptionLight-emitting electrochemical cellsense organs0210 nano-technology
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Removing Leakage and Surface Recombination in Planar Perovskite Solar Cells

2019

Thin-film solar cells suffer from various types of recombination, of which leakage current usually dominates at lower voltages. Herein, we demonstrate first a three-order reduction of the shunt loss mechanism in planar methylammonium lead iodide perovskite solar cells by replacing the commonly used hole transport layer poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS) with a better hole-selective polyarylamine. As a result, these cells exhibit superior operation under reduced light conditions, which we demonstrate for the extreme case of moonlight irradiance, at which open-circuit voltages of 530 mV can still be obtained. By the shunt removal we also observe the VOC to dro…

IodideFOS: Physical sciencesEnergy Engineering and Power TechnologyHole transport layerApplied Physics (physics.app-ph)02 engineering and technology010402 general chemistry01 natural sciencesPlanarPEDOT:PSSMaterials ChemistryLeakage (electronics)chemistry.chemical_classificationRenewable Energy Sustainability and the Environmentbusiness.industryPhysics - Applied Physics021001 nanoscience & nanotechnology0104 chemical sciencesFuel TechnologychemistryChemistry (miscellaneous)Optoelectronics0210 nano-technologybusinessShunt (electrical)RecombinationVoltage
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Quantifying the Composition of Methylammonium Lead Iodide Perovskite Thin Films with Infrared Spectroscopy

2019

Lead halide perovskites (ABX3) are generally formed from a reaction of the lead halide salt (BX2) with the halide salt of the A cation (AX). The effects of varying film compositions as result of non-stoichiometric precursor ratios on electronic properties of halide perovskites are currently under debate. It is imperative, but experimentally challenging, to determine the chemical composition of thin films as a function of precursor ratio for a full understanding of the effect. Herein we report a precise quantification of the methylammonium (MA) content in differently fabricated films of MAPbI3 via infrared (IR) spectroscopy. We compare the thin film data to the first high quality dielectric …

Materials scienceInfraredAnalytical chemistryInfrared spectroscopyHalideSurfaces Coatings and FilmsElectronic Optical and Magnetic MaterialsGeneral EnergyEllipsometryPhysical and Theoretical ChemistryThin filmSpectroscopyChemical compositionPerovskite (structure)The Journal of Physical Chemistry C
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Regioisomerism in cationic sulfonyl-substituted [Ir(C^N)2(N^N)]+ complexes: its influence on photophysical properties and LEC performance

2016

A series of regioisomeric cationic iridium complexes of the type [Ir(C^N)2(bpy)][PF6] (bpy = 2,2'-bipyridine) is reported. The complexes contain 2-phenylpyridine-based cyclometallating ligands with a methylsulfonyl group in either the 3-, 4- or 5-position of the phenyl ring. All the complexes have been fully characterized, including their crystal structures. In acetonitrile solution, all the compounds are green emitters with emission maxima between 493 and 517 nm. Whereas substitution meta to the Ir-C bond leads to vibrationally structured emission profiles and photoluminescence quantum yields of 74 and 77%, placing a sulfone substituent in a para position results in a broad, featureless em…

Sulfonylchemistry.chemical_classificationPhotoluminescenceChemistrySubstituentQuantum yieldchemistry.chemical_element02 engineering and technology010402 general chemistry021001 nanoscience & nanotechnologyPhotochemistry01 natural sciences0104 chemical sciencesSulfoneInorganic Chemistrychemistry.chemical_compoundCrystallographyDensity functional theoryIridiumTriplet state0210 nano-technologyDalton Transactions
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Vacuum Deposited Triple-Cation Mixed-Halide Perovskite Solar Cells

2018

Hybrid lead halide perovskites are promising materials for future photovoltaics applications. Their spectral response can be readily tuned by controlling the halide composition, while their stability is strongly dependent on the film morphology and on the type of organic cation used. Mixed cation and mixed halide systems have led to the most efficient and stable perovskite solar cells reported, so far they are prepared exclusively by solution-processing. This might be due to the technical difficulties associated with the vacuum deposition from multiple thermal sources, requiring a high level of control over the deposition rate of each precursor during the film formation. In this report, the…

Materials scienceRenewable Energy Sustainability and the EnvironmentInorganic chemistryDopingHalide02 engineering and technology010402 general chemistry021001 nanoscience & nanotechnology7. Clean energy01 natural sciences0104 chemical sciencesVacuum depositionGeneral Materials Science0210 nano-technologyScience technology and societyMaterialsCèl·lules fotoelèctriquesPerovskite (structure)
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Boosting inverted perovskite solar cell performance by using 9,9-bis(4-diphenylaminophenyl)fluorene functionalized with triphenylamine as a dopant-fr…

2019

In this study, two newly developed small molecules based on 9,9-bis(4-diphenylaminophenyl)fluorene functionalized with triphenylamine moieties, namely TPA-2,7-FLTPA-TPA and TPA-3,6-FLTPA-TPA, are designed, synthesized and characterized. The electrochemical, optical and thermal properties of both materials are investigated using various techniques. Afterwards, these materials are employed as dopant-free hole transporting materials (HTMs) in planar inverted perovskite solar cell devices with the aim of determining the device performance and studying their stability in comparison with reference N4,N4,N4′′,N4′′-tetra([1,10-biphenyl]-4-yl)-[1,1′:4′,1′′-terphenyl]-4,4′′-diamine (TaTm)-based devic…

Materials scienceDopantRenewable Energy Sustainability and the Environmentbusiness.industryEnergy conversion efficiencyPerovskite solar cell02 engineering and technologyGeneral ChemistryFluorene021001 nanoscience & nanotechnologyTriphenylamineElectrochemistry7. Clean energychemistry.chemical_compoundPlanarchemistryThermalOptoelectronicsGeneral Materials Science0210 nano-technologybusinessMaterialsCèl·lules fotoelèctriques
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Molecular Passivation of MoO3: Band Alignment and Protection of Charge Transport Layers in Vacuum-Deposited Perovskite Solar Cells

2019

Vacuum-deposition of perovskite solar cells can achieve efficiencies rivalling solution-based methods and it allows for more complex device stacks. MoO3 has been used to enhance carrier extraction to the transparent bottom electrode in a p-i-n configuration, here we show that by inserting an organic charge transport molecule it can also be used on the top of a perovskite absorber in a n-i-p configuration. This strategy enables the first vacuum-deposited perovskite solar cells with metal oxides as charge transporting layers for both electrons and holes leading to power conversion efficiency > 19 %.

Materials sciencePassivationbusiness.industryGeneral Chemical EngineeringExtraction (chemistry)Charge (physics)02 engineering and technologyGeneral Chemistry010402 general chemistry021001 nanoscience & nanotechnology01 natural sciences0104 chemical sciencesVacuum depositionMaterials ChemistryOptoelectronicsMOLIBDÊNIO0210 nano-technologybusinessMaterialsCèl·lules fotoelèctriquesPerovskite (structure)
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Improving Perovskite Solar Cells: Insights From a Validated Device Model

2017

To improve the efficiency of existing perovskite solar cells (PSCs), a detailed understanding of the underlying device physics during their operation is essential. Here, a device model has been developed and validated that describes the operation of PSCs and quantitatively explains the role of contacts, the electron and hole transport layers, charge generation, drift and diffusion of charge carriers and recombination. The simulation to the experimental data of vacuum-deposited CH3NH3PbI3 solar cells over multiple thicknesses has been fit and the device behavior under different operating conditions has been studied to delineate the influence of the external bias, charge-carrier mobilities, e…

Solar cellsMaterials sciencePassivationNanotechnology02 engineering and technology010402 general chemistry01 natural sciencesPolymer solar celllaw.inventionlawSolar cellGeneral Materials SciencePerovskite (structure)Theory of solar cellsRenewable Energy Sustainability and the Environmentbusiness.industryEnergy conversion efficiencyHybrid solar cell021001 nanoscience & nanotechnology0104 chemical sciencesPEROVSKITESOptoelectronicsCharge carrierPerovskite Solar CellsDEVICE PHYSICS0210 nano-technologybusinessAdvanced Energy Materials
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Efficient Wide-Bandgap Mixed-Cation and Mixed-Halide Perovskite Solar Cells by Vacuum Deposition

2021

Vacuum deposition methods are increasingly applied to the preparation of perovskite films and devices, in view of the possibility to prepare multilayer structures at low temperature. Vacuum-deposited, wide-bandgap solar cells based on mixed-cation and mixed-anion perovskites have been scarcely reported, due to the challenges associated with the multiple-source processing of perovskite thin films. In this work, we describe a four-source vacuum deposition process to prepare wide-bandgap perovskites of the type FA1-n Cs n Pb(I1-x Br x )3 with a tunable bandgap and controlled morphology, using FAI, CsI, PbI2, and PbBr2 as the precursors. The simultaneous sublimation of PbI2 and PbBr2 allows the…

Materials scienceBand gapEnergy Engineering and Power TechnologyHalide02 engineering and technology010402 general chemistry01 natural sciences7. Clean energyVacuum depositionMaterials ChemistryThin filmCèl·lules fotoelèctriquesPerovskite (structure)Range (particle radiation)Renewable Energy Sustainability and the Environmentbusiness.industryConductivitat elèctrica021001 nanoscience & nanotechnology0104 chemical sciencesFuel TechnologyChemistry (miscellaneous)HomogeneousOptoelectronicsPhotovoltaics and Wind EnergySublimation (phase transition)0210 nano-technologybusinessACS Energy Letters
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Perovskite solar cells prepared by flash evaporation

2015

A simple vacuum deposition method for the preparation of high quality hybrid organic-inorganic methylammonium lead iodide perovskite thin films is reported. When sandwiched in between organic charge transporting layers, such films lead to solar cells with a power conversion efficiency of 12.2%.

chemistry.chemical_classificationMaterials scienceF100IodideInorganic chemistryEnergy conversion efficiencyF200Metals and AlloysFlash evaporationGeneral ChemistryHybrid solar cellCatalysisSurfaces Coatings and FilmsElectronic Optical and Magnetic MaterialschemistryChemical engineeringVacuum depositionMaterials ChemistryCeramics and CompositesThin filmPerovskite (structure)Chemical Communications
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Photovoltaic devices employing vacuum-deposited perovskite layers

2015

Organic–inorganic perovskites have emerged as one of the most promising materials for future optoelectronics applications, most notably photovoltaics. The achievement of high-efficiency solar cells has been possible mainly through the understanding of the perovskite formation during the solution deposition of thin films. Vacuum deposition methods have also been developed and have intrinsic advantages over solution-based processing, including control over the film thickness and composition, low-temperature processing, and the possibility of preparing multilayer structures. This article summarizes the latest advances in the vacuum deposition of hybrid perovskites, with an emphasis on the appl…

Materials sciencebusiness.industryPhotovoltaic systemInorganic chemistryNanotechnologyCondensed Matter PhysicsVacuum depositionPhotovoltaicsPhysical vapor depositionEnergy materialsDeposition (phase transition)General Materials SciencePhysical and Theoretical ChemistryThin filmbusinessPerovskite (structure)MRS Bulletin
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Fully Vacuum-Processed Wide Band Gap Mixed-Halide Perovskite Solar Cells

2017

Methylammonium lead mixed-halide perovskites MAPb(BrxI1–x)3 are promising materials for the preparation of tandem devices. When exposed to light, MAPb(BrxI1–x)3 segregates in iodide- and bromide-rich phases, limiting the achievable photovoltage and hence the attainable device efficiency. To date only solution-processed mixed-halide perovskites have been demonstrated. We present fully vacuum-deposited mixed-halide perovskite thin films with band gap of 1.72 and 1.87 eV, prepared by controlling the deposition rates of the different halide precursors. When used in thin-film devices, these materials lead to power conversion efficiencies of 15.9 and 10.5%, respectively, which are among the highe…

chemistry.chemical_classificationMaterials scienceTandemRenewable Energy Sustainability and the EnvironmentBand gapbusiness.industryIodideWide-bandgap semiconductorEnergy Engineering and Power TechnologyHalide02 engineering and technology010402 general chemistry021001 nanoscience & nanotechnology01 natural sciences0104 chemical sciencesFuel TechnologychemistryChemistry (miscellaneous)Materials ChemistryOptoelectronicsThin film0210 nano-technologybusinessDeposition (law)Perovskite (structure)ACS Energy Letters
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Efficient photovoltaic and electroluminescent perovskite devices.

2015

Planar diode structures employing hybrid organic–inorganic methylammonium lead iodide perovskites lead to multifunctional devices exhibiting both a high photovoltaic efficiency and good electroluminescence. The electroluminescence strongly improves at higher current density applied using a pulsed driving method.

chemistry.chemical_classificationMaterials sciencebusiness.industryF300H600Photovoltaic systemIodideF100Metals and AlloysF200General ChemistryElectroluminescenceCatalysisSurfaces Coatings and FilmsElectronic Optical and Magnetic MaterialschemistryMaterials ChemistryCeramics and CompositesOptoelectronicsbusinessCurrent densityPlanar diodePerovskite (structure)Chemical communications (Cambridge, England)
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Charge Transport Layers Limiting the Efficiency of Perovskite Solar Cells: How To Optimize Conductivity, Doping, and Thickness

2019

Perovskite solar cells (PSCs) are one of the main research topics of the photovoltaic community; with efficiencies now reaching up to 24%, PSCs are on the way to catching up with classical inorganic solar cells. However, PSCs have not yet reached their full potential. In fact, their efficiency is still limited by nonradiative recombination, mainly via trap-states and by losses due to the poor transport properties of the commonly used transport layers (TLs). Indeed, state-of-the-art TLs (especially if organic) suffer from rather low mobilities, typically within 10(-5) and 10(-2) cm(-2) V-1 s(-1), when compared to the high mobilities, 1-10 cm(-2) V-1 s(-1), measured for perovskites. This work…

Materials scienceEnergy Engineering and Power TechnologyRECOMBINATIONdopingConductivityperovskite solar cellsCH3NH3PBI3Materials ChemistryElectrochemistryChemical Engineering (miscellaneous)ddc:530Electrical and Electronic EngineeringHYSTERESISMaterialsCèl·lules fotoelèctriquesPerovskite (structure)business.industryPhotovoltaic systemDopingInstitut für Physik und AstronomieCharge (physics)LimitingConductivitat elèctricaHALIDE PEROVSKITEScharge transportHysteresistransport layersOptoelectronicsTIO2conductivitybusiness
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Quadruple-Cation Wide-Bandgap Perovskite Solar Cells with Enhanced Thermal Stability Enabled by Vacuum Deposition.

2022

Vacuum processing of multicomponent perovskites is not straightforward, because the number of precursors is in principle limited by the number of available thermal sources. Herein, we present a process which allows increasing the complexity of the formulation of vacuum-deposited lead halide perovskite films by multisource deposition and premixing both inorganic and organic components. We apply it to the preparation of wide-bandgap CsMAFA triple-cation perovskite solar cells, which are found to be efficient but not thermally stable. With the aim of stabilizing the perovskite phase, we add guanidinium (GA+) to the material formulation and obtained CsMAFAGA quadruple-cation perovskite films wi…

Fuel TechnologyRenewable Energy Sustainability and the EnvironmentChemistry (miscellaneous)Materials ChemistryEnergy Engineering and Power TechnologyMaterialsCèl·lules fotoelèctriquesACS energy letters
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Deposition Kinetics and Compositional Control of Vacuum-Processed CH3NH3PbI3 Perovskite

2020

Halide perovskites have generated considerable research interest due to their excellent optoelectronic properties in the past decade. To ensure the formation of high-quality semiconductors, the deposition process for the perovskite film is a critical issue. Vacuum-based processing is considered to be a promising method, allowing, in principle, for uniform deposition on a large area. One of the benefits of vacuum processing is the control over the film composition through the use of quartz crystal microbalances (QCMs) that monitor the rates of the components in situ. In metal halide perovskites, however, one frequently employed component or precursor, CH3NH3I, exhibits nonstandard sublimatio…

Materials sciencebusiness.industryHalide02 engineering and technologyQuartz crystal microbalance010402 general chemistry021001 nanoscience & nanotechnology01 natural sciences0104 chemical sciencesAdsorptionSemiconductorSemiconductorsChemical engineeringGeneral Materials ScienceSublimation (phase transition)Physical and Theoretical Chemistry0210 nano-technologybusinessMaterialsQuartzStoichiometryPerovskite (structure)The Journal of Physical Chemistry Letters
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Efficient wide band gap double cation – double halide perovskite solar cells

2017

In this work we study the band gap variation and properties of the perovskite compound Cs0.15FA0.85Pb(BrxI1−x)3 as a function of the halide composition, with the aim of developing an efficient complementary absorber for MAPbI3 in all-perovskite tandem devices. We have found the perovskite stoichiometry Cs0.15FA0.85Pb(Br0.7I0.3)3 to be a promising candidate, thanks to its band gap of approximately 2 eV. Single junction devices using this perovskite absorber lead to a maximum PCE of 11.5%, among the highest reported for solar cells using perovskites with a band gap wider than 1.8 eV.

Materials scienceChemical substanceTandemRenewable Energy Sustainability and the Environmentbusiness.industryBand gapWide-bandgap semiconductorHalideNanotechnology02 engineering and technologyGeneral Chemistry010402 general chemistry021001 nanoscience & nanotechnology01 natural sciences0104 chemical sciencesOptoelectronicsGeneral Materials Science0210 nano-technologyScience technology and societybusinessStoichiometryPerovskite (structure)Journal of Materials Chemistry A
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Unravelling steady-state bulk recombination dynamics in thick efficient vacuum-deposited perovskite solar cells by transient methods

2019

Accurately identifying and understanding the dominant charge carrier recombination mechanism in perovskite solar cells are of crucial importance for further improvements of this already promising photovoltaic technology. Both optical and electrical transient methods have previously been employed to strive for this warranted goal. However, electrical techniques can be strongly influenced by the capacitive response of the device which hides the carrier recombination dynamics that are relevant under steady state conditions. To ascertain the identification of steady state relevant charge carrier dynamics, it is beneficial to evaluate thicker films to minimize the impact of device capacitance. H…

Materials scienceSteady stateRenewable Energy Sustainability and the Environmentbusiness.industryPhotovoltaic system02 engineering and technologyGeneral Chemistry021001 nanoscience & nanotechnologyCapacitancelaw.inventionActive layerlawSolar cellOptoelectronicsGeneral Materials ScienceCharge carrierTransient response0210 nano-technologybusinessMaterialsCèl·lules fotoelèctriquesPerovskite (structure)
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Recombination in Perovskite Solar Cells

2017

Trap-assisted recombination, despite being lower as compared with traditional inorganic solar cells, is still the dominant recombination mechanism in perovskite solar cells (PSCs) and limits their efficiency. We investigate the attributes of the primary trap assisted recombination channels (grain boundaries and interfaces) and their correlation to defect ions in PSCs. We achieve this by using a validated device model to fit the simulations to the experimental data of efficient vacuum-deposited p-i-n and n-i-p CH3NH3PbI3 solar cells, including the light intensity dependence of the open circuit voltage and fill factor. We find that, despite the presence of traps at interfaces and grain bounda…

Materials scienceLetterEFFICIENCYMETHYLAMMONIUM LEAD IODIDEMIGRATIONEnergy Engineering and Power TechnologyNanotechnology02 engineering and technologyQuantum dot solar cell010402 general chemistryFILMS01 natural sciencesIonMaterials ChemistryORGANOMETAL TRIHALIDE PEROVSKITEVOLTAGEHYSTERESISPerovskite (structure)Theory of solar cellsRenewable Energy Sustainability and the EnvironmentHybrid solar cellELECTRICAL-PROPERTIES021001 nanoscience & nanotechnologySURFACE-DEFECTSTRANSPORT0104 chemical sciencesLight intensityFuel TechnologyChemistry (miscellaneous)Chemical physicsGrain boundary0210 nano-technologyRecombinationACS Energy Letters
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Vacuum-Deposited 2D/3D Perovskite Heterojunctions

2019

Low-dimensional (quasi-) 2D perovskites are being extensively studied in order to enhance the stability and the open-circuit voltage of perovskite solar cells. Up to now, thin 2D perovskite layers on the surface and/or at the grain boundaries of 3D perovskites have been deposited solely by solution processing, leading to unavoidable intermixing between the two phases. In this work, we report the fabrication of 2D/3D/2D perovskite heterostructures by dual-source vacuum deposition, with the aim of studying the interaction between the 3D and 2D phases as well as the charge transport properties of 2D perovskites in neat 2D/3D interfaces. Unlike what is normally observed in solution-processed 3D…

Materials scienceRenewable Energy Sustainability and the Environmentbusiness.industryEnergy Engineering and Power TechnologyHeterojunction02 engineering and technology010402 general chemistry021001 nanoscience & nanotechnology01 natural sciences0104 chemical sciencesFuel TechnologySemiconductorsChemistry (miscellaneous)Materials ChemistryOptoelectronics0210 nano-technologybusinessMaterialsPerovskite (structure)Voltage
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Interface engineering in efficient vacuum deposited perovskite solar cells

2016

Abstract We studied the effect of the charge transport layers in p-i-n perovskite solar cells using vacuum deposited methylammonium lead iodide thin-film absorbers. While solution-processed perovskite films are frequently deposited directly on PEDOT:PSS leading to good solar cell performances, in some cases even to very good Voc values, we show that in devices employing vacuum deposited MAPbI3 perovskites, the removal of the polyTPD electron blocker substantially reduces the photovoltaic behavior. This is indicative of rather different charge transport properties in the vacuum deposited MAPbI3 perovskites compared to those prepared from solution. On the other hand, we investigated the use o…

FullereneMaterials scienceIonic bondingNanotechnology02 engineering and technologyElectroluminescence010402 general chemistry01 natural sciences7. Clean energylaw.inventionBiomaterialsPEDOT:PSSlawSolar cellMaterials ChemistryElectrical and Electronic EngineeringDiodePerovskite (structure)business.industryGeneral Chemistry021001 nanoscience & nanotechnologyCondensed Matter Physics0104 chemical sciencesElectronic Optical and Magnetic MaterialsElectrodeOptoelectronics0210 nano-technologybusinessOrganic Electronics
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Reduced Recombination Losses in Evaporated Perovskite Solar Cells by Postfabrication Treatment

2021

The photovoltaic perovskite research community has now developed a large set of tools and techniques to improve the power conversion efficiency (PCE). One such arcane trick is to allow the finished devices to dwell in time, and the PCE often improves. Herein, a mild postannealing procedure is implemented on coevaporated perovskite solar cells confirming a substantial PCE improvement, mainly attributed to an increased open-circuit voltage (V\(_{OC}\)). From a V\(_{OC}\) of around 1.11 V directly after preparation, the voltage improves to more than 1.18 V by temporal and thermal annealing. To clarify the origin of this annealing effect, an in-depth device experimental and simulation character…

Materials sciencePassivationbusiness.industryEnergy Engineering and Power TechnologyAtomic and Molecular Physics and OpticsElectronic Optical and Magnetic MaterialsOptoelectronicsddc:530Electrical and Electronic EngineeringbusinessMaterialsRecombinationCèl·lules fotoelèctriquesPerovskite (structure)
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Fully Evaporated High Efficiency Single Junction and Tandem Perovskite based Solar Cells.

2018

Materials scienceTandembusiness.industryOptoelectronicsbusinessPerovskite (structure)Proceedings of the 10th International Conference on Hybrid and Organic Photovoltaics
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Efficient Vacuum-Deposited Perovskite Solar Cells with Stable Cubic FA 1– x MA x PbI 3

2020

Preparation of black formamidinium lead iodide (FAPbI3) requires high temperature annealing and the incorporation of smaller A-site cations, such as methylammonium (MA+), cesium or rubidium. A major advantage of vacuum processing is the possibility to deposit perovskite films at room temperature (RT), without any annealing step. Here we demonstrate stabilization of the cubic perovskite phase at RT, in a three-sources co-sublimation method. We found that the MA+ incorporation is a self-limiting process, where the amount of MA+ which is incorporated in the perovskite is essentially unvaried with increasing MAI deposition rate. In this way a phase-pure, cubic perovskite with a bandgap of 1.53 …

Materials scienceAnnealing (metallurgy)virusesIodideInorganic chemistryEnergy Engineering and Power Technologychemistry.chemical_element02 engineering and technology010402 general chemistry01 natural sciences7. Clean energyRubidiumMaterials ChemistryCèl·lules fotoelèctriqueschemistry.chemical_classificationRenewable Energy Sustainability and the EnvironmentConductivitat elèctrica021001 nanoscience & nanotechnology0104 chemical sciencesFuel TechnologyFormamidiniumchemistryChemistry (miscellaneous)Caesium0210 nano-technologyACS Energy Letters
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Effects of Masking on Open-Circuit Voltage and Fill Factor in Solar Cells

2019

Guidelines for the correct measurement protocol of novel photovoltaic technologies such as perovskites are becoming more frequent in literature. This because, as will be confirmed in this perspective, it is not straightforward to correctly measure the efficiency parameters of these and many other novel solar cells. This is particularly the case for small area research devices which are prone to overestimate the short circuit current density, due to edge effects of various types. To reduce the inaccuracy of current density determination, the common recommended practice is to utilize masks with well‐defined apertures, often smaller than the device active area. Herein we show both experimental…

Masking (art)Computer scienceOpen-circuit voltagePhotovoltaic system02 engineering and technology010402 general chemistry021001 nanoscience & nanotechnology01 natural sciences0104 chemical sciencesGeneral EnergyElectronic engineeringFigure of meritEnergiaEnhanced Data Rates for GSM EvolutionCurrent (fluid)0210 nano-technologyCurrent densityCèl·lules fotoelèctriquesVoltage
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Fullerene imposed high open-circuit voltage in efficient perovskite based solar cells

2016

Five different commercially available fullerenes are evaluated as hole blocking/electron transporting materials in p–i–n methylammonium lead iodide perovskite solar cells using a vacuum deposited perovskite absorber layer. A significant enhancement of the solar cell performance can be obtained by selecting a suitable fullerene derivative. Open-circuit voltages as high as 1.11 volts are obtained leading to a power conversion efficiency of 14.6%.

Materials scienceFullereneInorganic chemistryIodide02 engineering and technology010402 general chemistry7. Clean energy01 natural scienceslaw.inventionlawSolar cellGeneral Materials SciencePerovskite (structure)chemistry.chemical_classificationRenewable Energy Sustainability and the EnvironmentOpen-circuit voltagebusiness.industryEnergy conversion efficiencyGeneral Chemistry021001 nanoscience & nanotechnology0104 chemical scienceschemistryOptoelectronics0210 nano-technologybusinessLayer (electronics)VoltageJournal of Materials Chemistry A
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Exceptionally long-lived light-emitting electrochemical cells: multiple intra-cation π-stacking interactions in [Ir(C^N)2(N^N)][PF6] emitters

2015

A series of cyclometalated iridium(iii) complexes [Ir(C^N)2(N^N)][PF6] (N^N = 2,2′-bipyridine (1), 6-phenyl-2,2′-bipyridine (2), 4,4′-di-tert-butyl-2,2′-bipyridine (3), 4,4′-di-tert-butyl-6-phenyl-2,2′-bipyridine (4); HC^N = 2-(3-phenyl)phenylpyridine (HPhppy) or 2-(3,5-diphenyl)phenylpyridine (HPh2ppy)) are reported. They have been synthesized using solvento precursors so as to avoid the use of chlorido-dimer intermediates, chloride ion contaminant being detrimental to the performance of [Ir(C^N)2(N^N)][PF6] emitters in light-electrochemical cell (LEC) devices. Single crystal structure determinations and variable temperature solution 1H NMR spectroscopic data confirm that the pendant pheny…

Coordination sphereF300ChemistryF100F200StackingAnalytical chemistrychemistry.chemical_elementGeneral ChemistryIonElectrochemical cellCrystallographyProton NMRIridiumLuminescenceSingle crystal
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Mixed Iodide-Bromide Methylammonium Lead Perovskite-based Diodes for Light Emission and Photovoltaics.

2015

Vacuum deposition techniques are used to prepare mixed iodide–bromide methylammonium lead perovskite diodes via an intermediate double layer of the pure iodide and bromide perovskites. The diodes lead to bright electroluminescence, whose emission spectra maxima shift from the infrared toward the visible with increasing bromide content. When illuminated with AM1.5 simulated sunlight the devices function as efficient solar cells with power conversion efficiencies as high as 12.9%.

chemistry.chemical_classificationInfraredbusiness.industryIodideElectroluminescencechemistry.chemical_compoundchemistryPhotovoltaicsBromideOptoelectronicsGeneral Materials ScienceLight emissionPhysical and Theoretical ChemistrybusinessDiodePerovskite (structure)The journal of physical chemistry letters
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Efficient vacuum deposited p-i-n and n-i-p perovskite solar cells employing doped charge transport layers

2016

Methylammonium lead halide perovskites have emerged as high performance photovoltaic materials. Most of these solar cells are prepared via solution-processing and record efficiencies (>20%) have been obtained employing perovskites with mixed halides and organic cations on (mesoscopic) metal oxides. Here, we demonstrate fully vacuum deposited planar perovskite solar cells by depositing methylammonium lead iodide in between intrinsic and doped organic charge transport molecules. Two configurations, one inverted with respect to the other, p-i-n and n-i-p, are prepared and optimized leading to planar solar cells without hysteresis and very high efficiencies, 16.5% and 20%, respectively. It is t…

Renewable Energy Sustainability and the EnvironmentChemistryPhotovoltaic systemDopingAnalytical chemistryHalidePerovskite solar cellNanotechnology02 engineering and technologyHybrid solar cellMethylammonium lead halide010402 general chemistry021001 nanoscience & nanotechnology01 natural sciencesPollutionPolymer solar cell0104 chemical scienceschemistry.chemical_compoundNuclear Energy and EngineeringEnvironmental Chemistry0210 nano-technologyMaterialsCèl·lules fotoelèctriquesPerovskite (structure)Energy Environ. Sci.
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Influence of doped charge transport layers on efficient perovskite solar cells

2018

Planar vacuum deposited p–i–n methyl ammonium lead tri-iodide perovskite solar cells are prepared with different electron and hole transporting layers, either doped or undoped. The effect of these layers on the solar cells performance (efficiency and stability) is studied. The main benefit of using doped layers lies in the formation of barrier free charge extraction contacts to the electrodes. However, this comes at the cost of increased residual absorption (reducing the current density and efficiency of the cells) and a decreased stability. A generic solar cell structure using undoped charge extraction layers is presented, containing a thin layer of a strong electron acceptor in between th…

Solar cells of the next generationMaterials scienceEnergy Engineering and Power Technology02 engineering and technologyElectron010402 general chemistry7. Clean energy01 natural scienceslaw.inventionlawSolar cellAbsorption (electromagnetic radiation)Perovskite (structure)chemistry.chemical_classificationRenewable Energy Sustainability and the Environmentbusiness.industryDopingElectron acceptor021001 nanoscience & nanotechnology0104 chemical sciencesFuel TechnologychemistryElectrodeOptoelectronics0210 nano-technologybusinessCurrent density
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Fluorine-free blue-green emitters for light-emitting electrochemical cells

2014

Date of Acceptance: 29/05/2014 There is presently a lack of efficient and stable blue emitters for light-emitting electrochemical cells (LEECs), which limits the development of white light emitting systems for lighting. Cyclometalated iridium complexes as blue emitters tend to show low photoluminescence efficiency due to significant ligand-centred character of the radiative transition. The most common strategy to blue-shift the emission is to use fluorine substituents on the cyclometalating ligand, such as 2,4-difluorophenylpyridine, dFppy, which has been shown to decrease the stability of the emitter in operating devices. Herein we report a series of four new charged cyclometalated iridium…

PhotoluminescenceMaterials scienceLigandchemistry.chemical_elementGeneral ChemistryTime-dependent density functional theoryQD ChemistryPhotochemistryElectrochemistryElectrochemical cellchemistry.chemical_compoundchemistryPyridineMaterials ChemistryFluorineQDIridiumJ. Mater. Chem. C
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Assigning ionic properties in perovskite solar cells; a unifying transient simulation/experimental study

2021

Kinetic modelling has proven to be essential to understand the time and spatial dependence of charge carriers in solar cells. Traditional drift–diffusion simulations have generally been employed to describe static steady-state conditions, whereas recently the transient counterpart has been able to reveal more detailed information regarding carrier kinetics. In addition to customary electron and hole dynamics, perovskite materials are known to also be strongly affected by the displacement of lattice vacancies, charged atoms or even entire molecules. Such ionic motion transpires on vastly different time scales compared to free charges and are generally not straightforward to simultaneously ac…

Materials scienceRenewable Energy Sustainability and the Environmentbusiness.industryOpen-circuit voltageEnergy Engineering and Power TechnologyIonic bonding02 engineering and technology010402 general chemistry021001 nanoscience & nanotechnologyThermal diffusivity01 natural sciences0104 chemical sciencesIonFuel TechnologyChemical physicsPhotovoltaicsCharge carrierTransient (oscillation)0210 nano-technologybusinessPerovskite (structure)Sustainable Energy & Fuels
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Efficient Monolithic Perovskite/Perovskite Tandem Solar Cells

2016

Thin-film solar cells suffer from various types of recombination, of which leakage current usually dominates at lower voltages. Herein, we demonstrate first a three-order reduction of the shunt loss mechanism in planar methylammonium lead iodide perovskite solar cells by replacing the commonly used hole transport layer poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS) with a better hole-selective polyarylamine. As a result, these cells exhibit superior operation under reduced light conditions, which we demonstrate for the extreme case of moonlight irradiance, at which open-circuit voltages of 530 mV can still be obtained. By the shunt removal we also observe the VOC to dro…

charge recombination layerMaterials sciencedoping02 engineering and technologyElectron010402 general chemistry01 natural sciencesPlanarPEDOT:PSSGeneral Materials Sciencevacuum depositionMaterialsperovskiteCèl·lules fotoelèctriquesLeakage (electronics)Renewable Energy Sustainability and the Environmentbusiness.industry021001 nanoscience & nanotechnology0104 chemical sciencesSemiconductorElectrodeOptoelectronicstandem solar cells0210 nano-technologybusinessRecombinationVoltage
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Influence of mobile ions on the electroluminescence characteristics of methylammonium lead iodide perovskite diodes

2016

In this work, we study the effect of voltage bias on the optoelectronic behavior of methylammonium lead iodide planar diodes. Upon biasing the diodes with a positive voltage, the turn-on voltage of the electroluminescence diminishes and its intensity substantially increases. This behavior is reminiscent of that observed in light-emitting electrochemical cells (LECs), single-layer electroluminescent devices in which the charge injection is assisted by the accumulation of ions at the electrode interface. Because of this mechanism, performances are largely independent from the work function of the electrodes. The similarities observed between planar perovskite diodes and LECs suggest that mobi…

SOLAR-CELLSMaterials scienceEMITTING ELECTROCHEMICAL-CELLSEXCITON BINDING-ENERGY02 engineering and technologyElectroluminescence010402 general chemistry01 natural sciencesElectrochemical cellEFFECTIVE MASSESRECENT PROGRESSGeneral Materials ScienceWork functionHYSTERESISPerovskite (structure)DiodeRenewable Energy Sustainability and the Environmentbusiness.industryBiasingGeneral ChemistryPERFORMANCE021001 nanoscience & nanotechnologyTURN-ON TIMESHALIDE PEROVSKITES0104 chemical sciencesP-N-JUNCTIONElectrodeOptoelectronics0210 nano-technologybusinessp–n junctionJournal of Materials Chemistry A
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Quantification of spatial inhomogeneity in perovskite solar cells by hyperspectral luminescence imaging

2016

Vacuum evaporated perovskite solar cells with a power conversion efficiency of 15% have been characterized using hyperspectral luminescence imaging. Hyperspectral luminescence imaging is a novel technique that offers spectrally resolved photoluminescence and electroluminescence maps (spatial resolution is 2 micrometer) on an absolute scale. This allows, using the generalized Planck’s law, the construction of absolute maps of the depth-averaged quasi-Fermi level splitting (Δμ), which determines the maximum achievable open circuit voltage (Voc) of the solar cells. In a similar way, using the generalized reciprocity relations the charge transfer efficiency of the cells can be obtained from the…

PhotonMaterials sciencePhotoluminescenceRenewable Energy Sustainability and the Environmentbusiness.industryOpen-circuit voltageEnergy conversion efficiencyHyperspectral imaging02 engineering and technology010402 general chemistry021001 nanoscience & nanotechnology01 natural sciencesPollution0104 chemical sciencesOpticsNuclear Energy and EngineeringEnvironmental ChemistryOptoelectronics0210 nano-technologyLuminescencebusinessAbsolute scalePerovskite (structure)Energy & Environmental Science
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CCDC 1019228: Experimental Crystal Structure Determination

2015

Related Article: Andreas M. Bünzli, Edwin C. Constable, Catherine E. Housecroft, Alessandro Prescimone, Jennifer A. Zampese, Giulia Longo, Lidón Gil-Escrig, Antonio Pertegás, Enrique Ortí, Henk J. Bolink|2015|Chemical Science|6|2843|doi:10.1039/C4SC03942D

Space GroupCrystallographyCrystal System(22'-bipyridine)-bis(3-(pyridin-2-yl)biphenyl-4-yl)-iridium hexafluorophosphateCrystal StructureCell ParametersExperimental 3D Coordinates
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CCDC 1019229: Experimental Crystal Structure Determination

2015

Related Article: Andreas M. Bünzli, Edwin C. Constable, Catherine E. Housecroft, Alessandro Prescimone, Jennifer A. Zampese, Giulia Longo, Lidón Gil-Escrig, Antonio Pertegás, Enrique Ortí, Henk J. Bolink|2015|Chemical Science|6|2843|doi:10.1039/C4SC03942D

(6-Phenyl-22'-bipyridine)-bis(5'-(pyridin-2-yl)-11':3'1''-terphenyl-4'-yl)-iridium hexafluorophosphate toluene solvateSpace GroupCrystallographyCrystal SystemCrystal StructureCell ParametersExperimental 3D Coordinates
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CCDC 1421913: Experimental Crystal Structure Determination

2016

Related Article: Cathrin D. Ertl, Lidón Gil-Escrig, Jesús Cerdá, Antonio Pertegás, Henk J. Bolink, José M. Junquera-Hernández, Alessandro Prescimone, Markus Neuburger, Edwin C. Constable, Enrique Ortí, Catherine E. Housecroft|2016|Dalton Trans.|45|11668|doi:10.1039/C6DT01325B

Space GroupCrystallographyCrystal SystemCrystal StructureCell ParametersExperimental 3D Coordinates(22'-bipyridine)-bis(5-(methylsulfonyl)-2-(pyridin-2-yl)phenyl)-iridium hexafluorophosphate dichloromethane solvate
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CCDC 1421914: Experimental Crystal Structure Determination

2016

Related Article: Cathrin D. Ertl, Lidón Gil-Escrig, Jesús Cerdá, Antonio Pertegás, Henk J. Bolink, José M. Junquera-Hernández, Alessandro Prescimone, Markus Neuburger, Edwin C. Constable, Enrique Ortí, Catherine E. Housecroft|2016|Dalton Trans.|45|11668|doi:10.1039/C6DT01325B

Space GroupCrystallographyCrystal System(22'-bipyridine)-bis(4-(methylsulfonyl)-2-(pyridin-2-yl)phenyl)-iridium hexafluorophosphate hydrateCrystal StructureCell ParametersExperimental 3D Coordinates
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CCDC 1019226: Experimental Crystal Structure Determination

2015

Related Article: Andreas M. Bünzli, Edwin C. Constable, Catherine E. Housecroft, Alessandro Prescimone, Jennifer A. Zampese, Giulia Longo, Lidón Gil-Escrig, Antonio Pertegás, Enrique Ortí, Henk J. Bolink|2015|Chemical Science|6|2843|doi:10.1039/C4SC03942D

Space GroupCrystallographyCrystal SystemCrystal StructureCell ParametersExperimental 3D Coordinates2-(11':3'1''-terphenyl-5'-yl)pyridine
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CCDC 1421915: Experimental Crystal Structure Determination

2016

Related Article: Cathrin D. Ertl, Lidón Gil-Escrig, Jesús Cerdá, Antonio Pertegás, Henk J. Bolink, José M. Junquera-Hernández, Alessandro Prescimone, Markus Neuburger, Edwin C. Constable, Enrique Ortí, Catherine E. Housecroft|2016|Dalton Trans.|45|11668|doi:10.1039/C6DT01325B

Space GroupCrystallography(22'-bipyridine)-bis(3-(methylsulfonyl)-2-(pyridin-2-yl)phenyl)-iridium hexafluorophosphateCrystal SystemCrystal StructureCell ParametersExperimental 3D Coordinates
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CCDC 1019227: Experimental Crystal Structure Determination

2015

Related Article: Andreas M. Bünzli, Edwin C. Constable, Catherine E. Housecroft, Alessandro Prescimone, Jennifer A. Zampese, Giulia Longo, Lidón Gil-Escrig, Antonio Pertegás, Enrique Ortí, Henk J. Bolink|2015|Chemical Science|6|2843|doi:10.1039/C4SC03942D

Space GroupCrystallography(22'-bipyridine)-bis(5'-(pyridin-2-yl)-11':3'1''-terphenyl-4'-yl)-iridium hexafluorophosphate ethanol solvateCrystal SystemCrystal StructureCell ParametersExperimental 3D Coordinates
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