Search results for "Small polaron"

showing 5 items of 5 documents

Characterization of defect density states in MoOx for c-Si solar cell applications

Layers of MoOx have been deposited by thermal evaporation followed by post-deposition annealing (PDA). The density of states (DOS) distributions of the MoOx films were extracted deconvoluting the absorption spectra, measured by a phothermal deflection spectroscopy setup, including the small polaron contribution. Results revealed a sub-band defect distribution centered 1.1 eV below the conduction band; the amplitude of this distribution was found to increase with PDA temperature and film thickness.

c-Si solar cell photovoltaic transition metal oxide molybdenum oxide density of states small polaronSettore ING-INF/01 - Elettronica
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Characterization of the defect density states in MoOx for c-Si solar cell applications

2021

Thin layers of MoOx have been deposited by thermal evaporation followed by post-deposition annealing. The density of states distributions of the MoOx films were extracted deconvoluting the absorption spectra, measured by a photothermal deflection spectroscopy setup, including the small polaron contribution. Results revealed a sub-band defect distribution centered 1.1 eV below the conduction band; the amplitude of this distribution was found to increase with post-deposition annealing temperature and film thickness.

Materials scienceAbsorption spectroscopyc-Si solar cell photovoltaic transition metal oxide molybdenum oxide density of states small polaronAnnealing (metallurgy)02 engineering and technologyPolaron01 natural sciencesMolecular physicsSettore ING-INF/01 - Elettronicalaw.inventionlaw0103 physical sciencesSolar cellMaterials ChemistryElectrical and Electronic EngineeringSpectroscopy010302 applied physicsThin layersDensity of statesPhotothermal therapy021001 nanoscience & nanotechnologyCondensed Matter Physicsc-Si solar cellMolybdenum oxideElectronic Optical and Magnetic MaterialsSmall polaronTransition metal oxideDensity of states0210 nano-technologyPhotovoltaicDensity of state
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TRANSITION METAL OXIDES AS SELECTIVE CONTACTS FOR C-SI SOLAR CELLS

2021

transition metal oxides solar cell c-Si defects small polaron molybdenum oxide titanium oxide efficiency photovoltaicSettore ING-INF/01 - Elettronica
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First principles calculations on CeO2 doped with Tb3+ ions

2019

This research was funded by the Latvian Council of Science (under the grant project lzp-2018/1-0147). Authors thank W. Chueh, J. Serra, R. Merkle, A. Popov for fruitful discussions.

Materials scienceHubbard modelchemistry.chemical_element02 engineering and technologyCrystal structureElectronic structure010402 general chemistryPolaron01 natural sciencesOxygenMolecular physicsIonInorganic ChemistryCondensed Matter::Materials ScienceFormation energy of oxygen vacancyTb3+:NATURAL SCIENCES:Physics [Research Subject Categories]Electrical and Electronic EngineeringPhysical and Theoretical ChemistrySpectroscopyOrganic ChemistryDoping021001 nanoscience & nanotechnologyAtomic and Molecular Physics and Optics0104 chemical sciencesElectronic Optical and Magnetic MaterialsSmall polaronchemistry(CeTb)O20210 nano-technologyGround stateDFT+UOptical Materials
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Density of States characterization of TiO2 films deposited by Pulsed Laser Deposition for Heterojunction solar cells

2021

The application of titanium dioxide (TiO2) in the photovoltaic field is gaining traction as this material can be deployed in doping-free heterojunction solar cells with the role of electron selective contact. For modeling-based optimization of such contact, knowledge of the titanium oxide defect density of states is crucial. In this paper, we report a method to extract the defect density through nondestructive optical measures, including the contribution given by small polaron optical transitions. The presence of both related to oxygen-vacancy defects and polarons is supported by the results of optical characterizations and the evaluation of previous observations resulting in a defect band …

Solar cell heterojunction photovoltaic defect density small polaron Pulsed Laser Deposition titanium dioxide defectsGeneral Materials ScienceElectrical and Electronic EngineeringCondensed Matter PhysicsSettore ING-INF/01 - ElettronicaAtomic and Molecular Physics and Optics
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