TY - JOUR
T1 - High-efficiency and thermally stable FACsPbI3 perovskite photovoltaics
AU - Li, Saisai
AU - Jiang, Yuanzhi
AU - Xu, Jian
AU - Wang, Di
AU - Ding, Zijin
AU - Zhu, Tong
AU - Chen, Bin
AU - Yang, Yingguo
AU - Wei, Mingyang
AU - Guo, Renjun
AU - Hou, Yi
AU - Chen, Yu
AU - Sun, Changjiu
AU - Wei, Keyu
AU - Qaid, Saif M.H.
AU - Lu, Haizhou
AU - Tan, Hairen
AU - Di, Dawei
AU - Chen, Jun
AU - Grätzel, Michael
AU - Sargent, Edward H.
AU - Yuan, Mingjian
N1 - Publisher Copyright:
© The Author(s), under exclusive licence to Springer Nature Limited 2024.
PY - 2024/11/7
Y1 - 2024/11/7
N2 - α-FA1−xCsxPbI3 is a promising absorbent material for efficient and stable perovskite solar cells (PSCs)1,2. However, the most efficient α-FA1−xCsxPbI3 PSCs require the inclusion of the additive methylammonium chloride3,4, which generates volatile organic residues (methylammonium) that limit device stability at elevated temperatures5. Previously, the highest certified power-conversion efficiency of α-FA1−xCsxPbI3 PSCs without methylammonium chloride was only approximately 24% (refs. 6,7), and these PSCs have yet to exhibit any stability advantages. Here we identify interfacial contact loss caused by the accumulation of Cs+ in conventional α-FA1−xCsxPbI3 PSCs, which deteriorates device performance and stability. Through in situ grazing-incidence wide-angle X-ray scattering analysis and density functional theory calculations, we demonstrate an intermediate-phase-assisted crystallization pathway enabled by acetate surface coordination to fabricate high-quality α-FA1−xCsxPbI3 films, without using the methylammonium additive. We herein report a certified stabilized power output efficiency of 25.94% and a reverse-scanning power-conversion efficiency of 26.64% for α-FA1−xCsxPbI3 PSCs. Moreover, the devices exhibited negligible contact losses and enhanced operational stability. They retained over 95% of their initial power-conversion efficiency after operating for over 2,000 h at the maximum power point under 1 sun, 85 °C and 60% relative humidity (ISOS-L-3).
AB - α-FA1−xCsxPbI3 is a promising absorbent material for efficient and stable perovskite solar cells (PSCs)1,2. However, the most efficient α-FA1−xCsxPbI3 PSCs require the inclusion of the additive methylammonium chloride3,4, which generates volatile organic residues (methylammonium) that limit device stability at elevated temperatures5. Previously, the highest certified power-conversion efficiency of α-FA1−xCsxPbI3 PSCs without methylammonium chloride was only approximately 24% (refs. 6,7), and these PSCs have yet to exhibit any stability advantages. Here we identify interfacial contact loss caused by the accumulation of Cs+ in conventional α-FA1−xCsxPbI3 PSCs, which deteriorates device performance and stability. Through in situ grazing-incidence wide-angle X-ray scattering analysis and density functional theory calculations, we demonstrate an intermediate-phase-assisted crystallization pathway enabled by acetate surface coordination to fabricate high-quality α-FA1−xCsxPbI3 films, without using the methylammonium additive. We herein report a certified stabilized power output efficiency of 25.94% and a reverse-scanning power-conversion efficiency of 26.64% for α-FA1−xCsxPbI3 PSCs. Moreover, the devices exhibited negligible contact losses and enhanced operational stability. They retained over 95% of their initial power-conversion efficiency after operating for over 2,000 h at the maximum power point under 1 sun, 85 °C and 60% relative humidity (ISOS-L-3).
UR - http://www.scopus.com/inward/record.url?scp=85207694902&partnerID=8YFLogxK
U2 - 10.1038/s41586-024-08103-7
DO - 10.1038/s41586-024-08103-7
M3 - Article
C2 - 39348872
AN - SCOPUS:85207694902
SN - 0028-0836
VL - 635
SP - 82
EP - 88
JO - Nature
JF - Nature
IS - 8037
ER -