Decoupling light- and oxygen-induced degradation mechanisms of Sn-Pb perovskites in all perovskite tandem solar cells

被引:8
|
作者
Bai, Yang [1 ,2 ]
Tian, Ruijia [1 ]
Sun, Kexuan [1 ]
Liu, Chang [1 ,2 ]
Lang, Xiting [1 ]
Yang, Ming [1 ]
Meng, Yuanyuan [1 ]
Xiao, Chuanxiao [1 ]
Wang, Yaohua [1 ]
Lu, Xiaoyi [1 ]
Wang, Jingnan [1 ]
Pan, Haibin [1 ]
Song, Zhenhua [1 ]
Zhou, Shujing [1 ]
Ge, Ziyi [1 ,2 ]
机构
[1] Chinese Acad Sci, Ningbo Inst Mat Technol & Engn, Zhejiang Prov Engn Res Ctr Energy Optoelect Mat &, Ningbo 315201, Peoples R China
[2] Univ Chinese Acad Sci, Ctr Mat Sci & Optoelect Engn, Beijing 100049, Peoples R China
基金
中国国家自然科学基金;
关键词
EFFICIENT; PASSIVATION; IODIDE;
D O I
10.1039/d4ee02427c
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
Efficiencies of all-perovskite tandem solar cells are dominantly constrained by the challenges pertaining to defects and stability within tin-lead (Sn-Pb) perovskite sub-cells. On top of the well-studied oxygen oxidation, defects related to iodide and the consequent generation of I2 upon light illumination pose significant degradation risks, leading to Sn2+ -> Sn4+ oxidation. To address this, we screen phenylhydrazine cation (PEH+)-based additives of varying polarities, which strongly coordinate with Sn for reinforcing the Sn-I bond, and interacting electrostatically with negatively charged defects (VSn, VFA, ISn, and I-i). The synergistic effects suppress the photo-induced formation of I2 and the subsequent oxidation of Sn-Pb perovskites, circumventing the stability concerns of narrow bandgap (NBG) perovskite solar cells (PSCs) under operational conditions. The reducing agent 2-mercaptobenzimidazole (MBI) was further introduced into the precursor solution, which not only demonstrates strong resistance to oxygen erosion, but also reduces the deep-level defect density of the Sn-Pb perovskites. Consequently, single-junction Sn-Pb cells achieve a champion efficiency of 23.0%. The enhanced light stability allows these cells to retain 89.4% of their initial efficiency after 400 hours of continuous operation, as assessed by tracking the maximum power point (MPP). We further integrated the Sn-Pb perovskite into a two-terminal (2T) monolithic all-perovskite tandem cell and achieved a PCE of 27.9% (27.2% certified). Meanwhile, the encapsulated tandem device maintained 90.3% of its initial PCE after 300 h through MPP tracking. The work offers new ideas for tackling the stability issues related to light-triggered oxidation. This study showed PEHCl-CN can enhance the strength of Sn-I, resulting in good light stability. The subsequent doping of MBI resulted in good air stability. This enables the integrated 2T all-perovskite device to achieve an efficiency of 27.9%.
引用
收藏
页码:8557 / 8569
页数:14
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