期刊
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
卷 138, 期 8, 页码 2649-2655出版社
AMER CHEMICAL SOC
DOI: 10.1021/jacs.5b11740
关键词
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资金
- King Abdullah University of Science and Technology (KAUST) [KUS-11-009-21]
- Ontario Research Fund Research Excellence Program
- Natural Sciences and Engineering Research Council (NSERC) of Canada
- National Research Foundation of Korea Grant - Korean Government [2014R1A2A1A09005656, 2015M1A2A2058365]
- National Research Foundation of Korea [2015M1A2A2058365, 2014R1A2A1A09005656] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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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