Synergistic Strategy of Anion and Cation at the SnO2/Perovskite Interface Constructing Efficient and Stable Solar Cells

被引:0
作者
Jiang, Haokun [1 ]
Zhang, Jiakang [1 ]
Peng, Cheng [1 ]
Dong, Kaiwen [2 ]
Wei, Zhen [1 ]
Jiang, Wenjuan [1 ]
Long, Zhihao [1 ]
Zhou, Zhongmin [1 ]
机构
[1] Qingdao Univ Sci & Technol, Coll Chem & Mol Engn, Qingdao 266042, Peoples R China
[2] Qingdao Univ Sci & Technol, Coll Chem Engn, Qingdao 266042, Peoples R China
基金
中国国家自然科学基金;
关键词
chloride ions; conductivity; O vacancies; perovskite solar cells; SnO2; PEROVSKITE; PASSIVATION; PERFORMANCE; ORIGIN; FILMS;
D O I
10.1002/smll.202500240
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
The chemical regulation of SnO2 to enhance the properties of the buried interface in perovskite films is extensively investigated, but the underpinning mechanisms remain insufficiently understood. In this study, a synergistic strategy for cation fixation and anion diffusion by incorporating (3-amino-3-carboxypropyl) dimethylsulfonium chloride (Vitamin U, V-U) into a SnO2 colloidal solution is proposed. The cationic end (-COOH, -NH2) of V-U effectively inhibits the aggregation of SnO2 particles and promotes electron extraction and transport via chemical interactions. Simultaneously, the anionic end (Cl-) acts to eliminate surface hydroxyl groups on SnO2 and occupy oxygen vacancies. Crucially, a novel direct current polarization test is employed to elucidate the migration mechanism of Cl-, revealing that the migration principle of chloride ions in SnO2, and chloride ions can penetrate to the bottom of the perovskite layer, forming a wide bandgap thin layer that aids in energy level alignment and regulates charge transfer behavior. Ultimately, the device based on V-U-modified SnO2 achieves a champion efficiency of 25.27%. Moreover, it demonstrates impressive storage stability with a T90 of 5770 h and retains 86% of its initial efficiency after 1110 h of continuous light exposure.
引用
收藏
页数:12
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