Ligand-Stabilized Reduced-Dimensionality Perovskites
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Abstract
Metal halide perovskites have rapidly advanced thin-film photovoltaic performance; as a result, the materials' observed instabilities urgently require a solution. Using density functional theory (DFT), we show that a low energy of formation, exacerbated in the presence of humidity, explains the propensity of perovskites to decompose back into their precursors. We find, also using DFT, that intercalation of phenylethylammonium between perovskite layers introduces quantitatively appreciable van der Waals interactions. These drive an increased formation energy and should therefore improve material stability. Here we report reduced-dimensionality (quasi-2D) perovskite films that exhibit improved stability while retaining the high performance of conventional three-dimensional perovskites. Continuous tuning of the dimensionality, as assessed using photophysical studies, is achieved by the choice of stoichiometry in materials synthesis. We achieve the first certified hysteresis-free solar power conversion in a planar perovskite solar cell, obtaining a 15.3% certified PCE, and observe greatly improved performance longevity.
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The record
- Venue
- Journal of the American Chemical Society
- Topic
- Perovskite Materials and Applications
- Field
- Engineering
- Canadian institutions
- Canada Research ChairsUniversity of Toronto
- Funders
- Natural Sciences and Engineering Research Council of CanadaKing Abdullah University of Science and TechnologyNational Research Foundation of Korea
- Keywords
- ChemistryPerovskite (structure)van der Waals forcePerovskite solar cellDensity functional theoryHalideEnergy conversion efficiencyHysteresisCurse of dimensionalityIntercalation (chemistry)Chemical physicsStoichiometryPhotovoltaic systemNanotechnologyComputational chemistryPhysical chemistryMoleculeInorganic chemistryOptoelectronicsCrystallographyMaterials scienceCondensed matter physicsOrganic chemistry
- Has abstract in OpenAlex
- yes