TY - JOUR
T1 - Chiral cation promoted interfacial charge extraction for efficient tin-based perovskite solar cells
AU - Gao, Weiyin
AU - Dong, He
AU - Sun, Nan
AU - Chao, Lingfeng
AU - Hui, Wei
AU - Wei, Qi
AU - Li, Hai
AU - Xia, Yingdong
AU - Gao, Xingyu
AU - Xing, Guichuan
AU - Wu, Zhongbin
AU - Song, Lin
AU - Müller-Buschbaum, Peter
AU - Ran, Chenxin
AU - Chen, Yonghua
N1 - Publisher Copyright:
© 2021 Science Press and Dalian Institute of Chemical Physics, Chinese Academy of Sciences
PY - 2022/5
Y1 - 2022/5
N2 - Pb-free Sn-based perovskite solar cells (PSCs) have recently made inspiring progress, and power conversion efficiency (PCE) of 14.8% has been achieved. However, due to the energy-level mismatch and poor interfacial contact between commonly used hole transport layer (i.e., poly(3,4-ethylenedioxythiophene):poly(styrene sulfonate), PEDOT:PSS) and FASnI3 film, it is still challenging to effectively extract holes at the interface. Owing to the p-type nature of Sn-based perovskites, the efficient hole extraction is of particular significance to improve the PCE of their solar cells. In this work, for the first time, the role of chiral cations, α-methylbenzylamine (S-/R-/rac-MBA), in promoting hole transportation of FASnI3-based PSCs is demonstrated. The introduction of MBAs is found to form 2D/3D film with low-dimensional structures locating at PEDOT:PSS/FASnI3 interface, which facilitates the energy level alignment and efficient charge transfer at the interface. Importantly, chiral-induced spin selectivity (CISS) effect of R-MBA2SnI4 induced by chiral R-MBA cation is found to further assist the specific interfacial transport of accumulated holes. As a result, R-MBA-based PSCs achieve decent PCE of 10.73% with much suppressed hysteresis and enhanced device stability. This work opens up a new strategy to efficiently promote the interfacial extraction of accumulated charges in working PSCs.
AB - Pb-free Sn-based perovskite solar cells (PSCs) have recently made inspiring progress, and power conversion efficiency (PCE) of 14.8% has been achieved. However, due to the energy-level mismatch and poor interfacial contact between commonly used hole transport layer (i.e., poly(3,4-ethylenedioxythiophene):poly(styrene sulfonate), PEDOT:PSS) and FASnI3 film, it is still challenging to effectively extract holes at the interface. Owing to the p-type nature of Sn-based perovskites, the efficient hole extraction is of particular significance to improve the PCE of their solar cells. In this work, for the first time, the role of chiral cations, α-methylbenzylamine (S-/R-/rac-MBA), in promoting hole transportation of FASnI3-based PSCs is demonstrated. The introduction of MBAs is found to form 2D/3D film with low-dimensional structures locating at PEDOT:PSS/FASnI3 interface, which facilitates the energy level alignment and efficient charge transfer at the interface. Importantly, chiral-induced spin selectivity (CISS) effect of R-MBA2SnI4 induced by chiral R-MBA cation is found to further assist the specific interfacial transport of accumulated holes. As a result, R-MBA-based PSCs achieve decent PCE of 10.73% with much suppressed hysteresis and enhanced device stability. This work opens up a new strategy to efficiently promote the interfacial extraction of accumulated charges in working PSCs.
KW - 2D/3D structure
KW - Chiral cation
KW - Interfacial charge extraction
KW - Solar cells
KW - Tin perovskite
UR - https://www.scopus.com/pages/publications/85123170932
U2 - 10.1016/j.jechem.2021.09.019
DO - 10.1016/j.jechem.2021.09.019
M3 - Article
AN - SCOPUS:85123170932
SN - 2095-4956
VL - 68
SP - 789
EP - 796
JO - Journal of Energy Chemistry
JF - Journal of Energy Chemistry
ER -