TY - JOUR
T1 - Ligand-Stabilized Reduced-Dimensionality Perovskites
AU - Quan, Li Na
AU - Yuan, Mingjian
AU - Comin, Riccardo
AU - Voznyy, Oleksandr
AU - Beauregard, Eric M.
AU - Hoogland, Sjoerd
AU - Buin, Andrei
AU - Kirmani, Ahmad R.
AU - Zhao, Kui
AU - Amassian, Aram
AU - Kim, Dong Ha
AU - Sargent, Edward H.
N1 - Funding Information:
This publication is based in part on work supported by Award KUS-11-009-21, made by King Abdullah University of Science and Technology (KAUST), by the Ontario Research Fund Research Excellence Program, and by the Natural Sciences and Engineering Research Council (NSERC) of Canada. L.N.Q. and D.H.K. acknowledge financial support by National Research Foundation of Korea Grant, funded by the Korean Government (2014R1A2A1A09005656; 2015M1A2A-2058365). The authors thank Dr. X. Lan for assistance in SEM image acquisition; M. Adachi, B. Sutherland, F. Fan, J. Xu, and A. Janmohamed for fruitful discussions; and R. Wolowiec and D. Kopilovic for their assistance during the course of study.
Publisher Copyright:
© 2016 American Chemical Society.
PY - 2016/3/2
Y1 - 2016/3/2
N2 - 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.
AB - 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.
UR - http://www.scopus.com/inward/record.url?scp=84960172128&partnerID=8YFLogxK
U2 - 10.1021/jacs.5b11740
DO - 10.1021/jacs.5b11740
M3 - Article
AN - SCOPUS:84960172128
SN - 0002-7863
VL - 138
SP - 2649
EP - 2655
JO - Journal of the American Chemical Society
JF - Journal of the American Chemical Society
IS - 8
ER -