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RESEARCH PRODUCT

Efficient Wide-Bandgap Mixed-Cation and Mixed-Halide Perovskite Solar Cells by Vacuum Deposition

Lidón Gil-escrigSteve AlbrechtMichele SessoloFrancisco PalazonZafer HawashHenk J. BolinkChris DreessenEllen Moons

subject

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-technologybusiness

description

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 relative Br/Cs content to be decoupled and controlled, resulting in homogeneous perovskite films with a bandgap in the 1.7-1.8 eV range and no detectable halide segregation. Solar cells based on 1.75 eV bandgap perovskites show efficiency up to 16.8% and promising stability, maintaining 90% of the initial efficiency after 2 weeks of operation.

yearjournalcountryeditionlanguage
2021-02-03ACS Energy Letters
https://doi.org/10.1021/acsenergylett.0c02445