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제117회 대한화학회 학술발표회, 총회 및 기기전시회 안내 Ligand-Stabilized Reduced-Dimensionality Perovskites

2016년 3월 24일 09시 44분 26초
KCS2.O-12 이곳을 클릭하시면 발표코드에 대한 설명을 보실 수 있습니다.
목 12시 : 03분
한국다우케미칼 우수논문상 수상자 구두발표
저자 및
Li Na Quan, Mingjian Yuan1, Riccardo Comin1, Oleksandr Voznyy1, Eric M. Beauregard1, Sjoerd Hoogland1, Andrei Buin1, Ahmad R. Kirmani2, Kui Zhao2, Aram Amassian2, 김동하*, Edward H. Sargent3,*
이화여자대학교 화학나노과학과, Korea
1Department of Electrical and Computer Engineering, University of Toronto, Canada
2King Abdullah University of Science and Technology (KAUST), Canada
3Department of Electrical and Computer Engineering, University of Toronto, Saudi Arabia

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; and these drive an increased formation energy and should therefore improve material stability. Here we report the 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.