TY - JOUR
T1 - Flattening Grain-Boundary Grooves for Perovskite Solar Cells with High Optomechanical Reliability
AU - Hao, Mingwei
AU - Duan, Tianwei
AU - Ma, Zhiwei
AU - Ju, Ming-Gang
AU - Bennett, Joseph A.
AU - Liu, Tanghao
AU - Guo, Peijun
AU - Zhou, Yuanyuan
N1 - Funding Information:
Y.Z. acknowledges the Early Career Scheme (No. 22300221), General Research Fund (No. 12302822) from the Hong Kong Research Grant Council (RGC), and the Excellent Young Scientists Funds (No. 52222318) from National Natural Science Foundation of China. Y.Z. also acknowledge the start-up grants, the Initiation Grant – Faculty Niche Research Areas (IG-FNRA) 2020/21 and the Interdisciplinary Research Matching Scheme (IRMS) 2020/21 of HKBU. The authors also acknowledge the experiment assistance from Ms. Y. Zhang and Mr. T. Xiao from HKBU, and Mr. Z. Li and S. Pang from Qingdao Institute of Bioenergy & Bioprocess Technology, Chinese Academy of Sciences. J.A.B. was supported by a Dean's Research Fellowship from Yale University.
Publisher copyright:
© 2023 The Authors. Advanced Materials published by Wiley-VCH GmbH
PY - 2023/4/13
Y1 - 2023/4/13
N2 - Optomechanical reliability has emerged as an important criterion for evaluating the performance and commercialization potential of perovskite solar cells (PSCs) due to the mechanical-property mismatch of metal halide perovskites with other device layer. In this work, grain-boundary grooves, a rarely discussed film microstructural characteristic, are found to impart significant effects on the optomechanical reliability of perovskite–substrate heterointerfaces and thus PSC performance. By pre-burying iso-butylammonium chloride additive in the electron-transport layer (ETL), GB grooves (GBGs) are flattened and an optomechanically reliable perovskite heterointerface that resists photothermal fatigue is created. The improved mechanical integrity of the ETL–perovskite heterointerfaces also benefits the charge transport and chemical stability by facilitating carrier injection and reducing moisture or solvent trapping, respectively. Accordingly, high-performance PSCs which exhibit efficiency retentions of 94.8% under 440 h damp heat test (85% RH and 85 °C), and 93.0% under 2000 h continuous light soaking are achieved.
AB - Optomechanical reliability has emerged as an important criterion for evaluating the performance and commercialization potential of perovskite solar cells (PSCs) due to the mechanical-property mismatch of metal halide perovskites with other device layer. In this work, grain-boundary grooves, a rarely discussed film microstructural characteristic, are found to impart significant effects on the optomechanical reliability of perovskite–substrate heterointerfaces and thus PSC performance. By pre-burying iso-butylammonium chloride additive in the electron-transport layer (ETL), GB grooves (GBGs) are flattened and an optomechanically reliable perovskite heterointerface that resists photothermal fatigue is created. The improved mechanical integrity of the ETL–perovskite heterointerfaces also benefits the charge transport and chemical stability by facilitating carrier injection and reducing moisture or solvent trapping, respectively. Accordingly, high-performance PSCs which exhibit efficiency retentions of 94.8% under 440 h damp heat test (85% RH and 85 °C), and 93.0% under 2000 h continuous light soaking are achieved.
KW - grain-boundary grooves
KW - interface modification
KW - microstructural characteristics
KW - optomechanical reliability
KW - perovskite solar cells
UR - http://www.scopus.com/inward/record.url?scp=85149364649&partnerID=8YFLogxK
U2 - 10.1002/adma.202211155
DO - 10.1002/adma.202211155
M3 - Journal article
SN - 0935-9648
VL - 35
JO - Advanced Materials
JF - Advanced Materials
IS - 15
M1 - 2211155
ER -
