TY - JOUR
T1 - Reducing Energy Disorder in Perovskite Solar Cells by Chelation
AU - Jiang, Yiting
AU - Wang, Jiabin
AU - Zai, Huachao
AU - Ni, Dongyuan
AU - Wang, Jiayu
AU - Xue, Peiyao
AU - Li, Nengxu
AU - Jia, Boyu
AU - Lu, Huanjun
AU - Zhang, Yu
AU - Wang, Feng
AU - Guo, Zhenyu
AU - Bi, Zhaozhao
AU - Xie, Haipeng
AU - Wang, Qian
AU - Ma, Wei
AU - Tu, Yingfeng
AU - Zhou, Huanping
AU - Zhan, Xiaowei
N1 - Publisher Copyright:
© 2022 American Chemical Society. All rights reserved.
PY - 2022/3/30
Y1 - 2022/3/30
N2 - In inverted perovskite solar cells (PSCs), the fullerene derivative [6,6]-phenyl-C61-butyric acid methyl ester (PCBM) is a widely used electron transport material. However, a high degree of energy disorder and inadequate passivation of PCBM limit the efficiency of devices, and severe self-aggregation and unstable morphology limit the lifespan of devices. Here, we design a series of fullerene dyads FP-Cn (n = 4, 8, 12) to replace PCBM as an electron transport layer, where [60]fullerene is linked with a terpyridine chelating group via a flexible alkyl chain of different lengths as a spacer. Among three fullerene dyads, FP-C8 shows the most enhanced molecule ordering and adhesion with the perovskite surface due to the balanced decoupling between the chelation effect from terpyridine and the self-assembly of fullerene, leading to lower energy disorder and higher morphological stability relative to PCBM. The FP-C8/C60-based devices using Cs0.05FA0.90MA0.05PbI2.85Br0.15as a light absorber show a power conversion efficiency of 21.69%, higher than that of PCBM/C60 (20.09%), benefiting from improved electron extraction and transport as well as reduced charge recombination loss. When employing FAPbI3as a light absorber, the FP-C8/C60-based devices exhibit an efficiency of 23.08%, which is the champion value of inverted PSCs with solution-processed fullerene derivatives. Moreover, the FP-C8/C60-based devices show better moisture and thermal stability than PCBM/C60-based devices and maintain 96% of their original efficiency after 1200 h of operation, while their counterpart PCBM/C60 maintains 60% after 670 h.
AB - In inverted perovskite solar cells (PSCs), the fullerene derivative [6,6]-phenyl-C61-butyric acid methyl ester (PCBM) is a widely used electron transport material. However, a high degree of energy disorder and inadequate passivation of PCBM limit the efficiency of devices, and severe self-aggregation and unstable morphology limit the lifespan of devices. Here, we design a series of fullerene dyads FP-Cn (n = 4, 8, 12) to replace PCBM as an electron transport layer, where [60]fullerene is linked with a terpyridine chelating group via a flexible alkyl chain of different lengths as a spacer. Among three fullerene dyads, FP-C8 shows the most enhanced molecule ordering and adhesion with the perovskite surface due to the balanced decoupling between the chelation effect from terpyridine and the self-assembly of fullerene, leading to lower energy disorder and higher morphological stability relative to PCBM. The FP-C8/C60-based devices using Cs0.05FA0.90MA0.05PbI2.85Br0.15as a light absorber show a power conversion efficiency of 21.69%, higher than that of PCBM/C60 (20.09%), benefiting from improved electron extraction and transport as well as reduced charge recombination loss. When employing FAPbI3as a light absorber, the FP-C8/C60-based devices exhibit an efficiency of 23.08%, which is the champion value of inverted PSCs with solution-processed fullerene derivatives. Moreover, the FP-C8/C60-based devices show better moisture and thermal stability than PCBM/C60-based devices and maintain 96% of their original efficiency after 1200 h of operation, while their counterpart PCBM/C60 maintains 60% after 670 h.
UR - http://www.scopus.com/inward/record.url?scp=85127394245&partnerID=8YFLogxK
U2 - 10.1021/jacs.1c12732
DO - 10.1021/jacs.1c12732
M3 - Article
C2 - 35306820
AN - SCOPUS:85127394245
SN - 0002-7863
VL - 144
SP - 5400
EP - 5410
JO - Journal of the American Chemical Society
JF - Journal of the American Chemical Society
IS - 12
ER -