Low trap-state density and long carrier diffusion in organolead trihalide perovskite single crystals
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Abstract
The fundamental properties and ultimate performance limits of organolead trihalide MAPbX3 (MA = CH3NH3(+); X = Br(-) or I(-)) perovskites remain obscured by extensive disorder in polycrystalline MAPbX3 films. We report an antisolvent vapor-assisted crystallization approach that enables us to create sizable crack-free MAPbX3 single crystals with volumes exceeding 100 cubic millimeters. These large single crystals enabled a detailed characterization of their optical and charge transport characteristics. We observed exceptionally low trap-state densities on the order of 10(9) to 10(10) per cubic centimeter in MAPbX3 single crystals (comparable to the best photovoltaic-quality silicon) and charge carrier diffusion lengths exceeding 10 micrometers. These results were validated with density functional theory calculations.
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The record
- Venue
- Science
- Topic
- Perovskite Materials and Applications
- Field
- Engineering
- Canadian institutions
- University of Toronto
- Funders
- Natural Sciences and Engineering Research Council of CanadaKing Abdullah University of Science and Technology
- Keywords
- TrihalideTrap (plumbing)DiffusionPerovskite (structure)Chemical physicsChemistryMaterials scienceAnalytical Chemistry (journal)CrystallographyInorganic chemistryEnvironmental chemistryThermodynamicsPhysicsHalide
- Has abstract in OpenAlex
- yes