TY - JOUR
T1 - Surface repair of wide-bandgap perovskites for high-performance all-perovskite tandem solar cells
AU - Lv, Xiaojing
AU - Li, Weisheng
AU - Zhang, Jin
AU - Yang, Yujie
AU - Jia, Xuefei
AU - Ji, Yitong
AU - Lin, Qianqian
AU - Huang, Wenchao
AU - Bu, Tongle
AU - Ren, Zhiwei
AU - Yao, Canglang
AU - Huang, Fuzhi
AU - Cheng, Yi Bing
AU - Tong, Jinhui
N1 - Publisher Copyright:
© 2024 Science Press
PY - 2024/6
Y1 - 2024/6
N2 - Wide-bandgap (WBG) perovskite solar cells (PSCs) play a fundamental role in perovskite-based tandem solar cells. However, the efficiency of WBG PSCs is limited by significant open-circuit voltage losses, which are primarily caused by surface defects. In this study, we present a novel method for modifying surfaces using the multifunctional S-ethylisothiourea hydrobromide (SEBr), which can passivate both Pb-I and FA-I terminated surfaces. Moreover, the SEBr upshifted the Fermi level at the perovskite interface, thereby promoting carrier collection. This proposed method was effective for both 1.67 and 1.77 eV WBG PSCs, achieving power conversion efficiencies (PCEs) of 22.47% and 19.90%, respectively, with VOC values of 1.28 and 1.33 V, along with improved film and device stability. With this advancement, we were able to fabricate monolithic all-perovskite tandem solar cells with a champion PCE of 27.10%. This research offers valuable insights for passivating the surface trap states of WBG perovskite through rational multifunctional molecular engineering.
AB - Wide-bandgap (WBG) perovskite solar cells (PSCs) play a fundamental role in perovskite-based tandem solar cells. However, the efficiency of WBG PSCs is limited by significant open-circuit voltage losses, which are primarily caused by surface defects. In this study, we present a novel method for modifying surfaces using the multifunctional S-ethylisothiourea hydrobromide (SEBr), which can passivate both Pb-I and FA-I terminated surfaces. Moreover, the SEBr upshifted the Fermi level at the perovskite interface, thereby promoting carrier collection. This proposed method was effective for both 1.67 and 1.77 eV WBG PSCs, achieving power conversion efficiencies (PCEs) of 22.47% and 19.90%, respectively, with VOC values of 1.28 and 1.33 V, along with improved film and device stability. With this advancement, we were able to fabricate monolithic all-perovskite tandem solar cells with a champion PCE of 27.10%. This research offers valuable insights for passivating the surface trap states of WBG perovskite through rational multifunctional molecular engineering.
KW - All-perovskite tandem solar cells
KW - Multifunctional molecule
KW - Surface defect
KW - Wide-bandgap perovskite
UR - http://www.scopus.com/inward/record.url?scp=85186266177&partnerID=8YFLogxK
U2 - 10.1016/j.jechem.2024.01.064
DO - 10.1016/j.jechem.2024.01.064
M3 - Journal article
AN - SCOPUS:85186266177
SN - 2095-4956
VL - 93
SP - 64
EP - 70
JO - Journal of Energy Chemistry
JF - Journal of Energy Chemistry
ER -