TY - JOUR
T1 - Mobile-Ion-Induced Degradation of Organic Hole-Selective Layers in Perovskite Solar Cells
AU - Zhao, Yicheng
AU - Zhou, Wenke
AU - Tan, Hairen
AU - Fu, Rui
AU - Li, Qi
AU - Lin, Fang
AU - Yu, Dapeng
AU - Walters, Grant
AU - Sargent, Edward H.
AU - Zhao, Qing
N1 - Funding Information:
This work was supported by National 973 Projects (2013CB932602, MOST) from the Ministry of Science and Technology, China, and the National Natural Science Foundation of China (NSFC 51622201, 61571015, 91433102, 11404009). H.T. acknowledges The Netherlands Organisation for Scientific Research (NWO) for a Rubicon grant (680-50-1511) in support of his postdoctoral research at University of Toronto.
Publisher Copyright:
© 2017 American Chemical Society.
PY - 2017/7/13
Y1 - 2017/7/13
N2 - Organometal halide perovskites are mixed electronic-ionic semiconductors. It is imperative to develop a deeper understanding of how ion-migration behavior in perovskites impacts the long-term operational stability of solar cells. In this work, we found that ion penetration from the perovskite layer into the adjacent organic hole-selective layer is a crucial cause of performance degradation in perovskite solar cells. The monovalent cation, namely, methylammonium (MA+), is the main ion species that penetrates into the organic hole-selective layer of Spiro-MeOTAD because of the built-in electric field during operation. The incorporation of MA+ induces deep-level defects in the Spiro-MeOTAD layer and thereby deteriorates the hole-transporting ability of Spiro-MeOTAD, degrading solar cell performance. Our work points to two ways to improve the stability of perovskite solar cells: one is to insert a compact ion-blocking layer between Spiro-MeOTAD and perovskite, and the other is to find a hole-selective layer that is insensitive to extraneous ions (MA+). (Chemical Equation Presented).
AB - Organometal halide perovskites are mixed electronic-ionic semiconductors. It is imperative to develop a deeper understanding of how ion-migration behavior in perovskites impacts the long-term operational stability of solar cells. In this work, we found that ion penetration from the perovskite layer into the adjacent organic hole-selective layer is a crucial cause of performance degradation in perovskite solar cells. The monovalent cation, namely, methylammonium (MA+), is the main ion species that penetrates into the organic hole-selective layer of Spiro-MeOTAD because of the built-in electric field during operation. The incorporation of MA+ induces deep-level defects in the Spiro-MeOTAD layer and thereby deteriorates the hole-transporting ability of Spiro-MeOTAD, degrading solar cell performance. Our work points to two ways to improve the stability of perovskite solar cells: one is to insert a compact ion-blocking layer between Spiro-MeOTAD and perovskite, and the other is to find a hole-selective layer that is insensitive to extraneous ions (MA+). (Chemical Equation Presented).
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U2 - 10.1021/acs.jpcc.7b04684
DO - 10.1021/acs.jpcc.7b04684
M3 - Article
AN - SCOPUS:85024122181
SN - 1932-7447
VL - 121
SP - 14517
EP - 14523
JO - Journal of Physical Chemistry C
JF - Journal of Physical Chemistry C
IS - 27
ER -