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Crystallization Kinetics Modulation of FASnI(3) Films with Pre-nucleation Clusters for Efficient Lead-Free Perovskite Solar Cells

文献类型： 外文期刊

作者： Meng, Xiangyue 1 ; Li, Yunfei 1 ; Qu, Yizhi 1 ; Chen, Haining 2 ; Jiang, Nan 3 ; Li, Minghua 4 ; Xue, Ding-Jiang 4 ; Hu, 1 ;

作者机构： 1.Univ Chinese Acad Sci, Sch Optoelect, Beijing 100049, Peoples R China

2.Beihang Univ, Sch Mat Sci & Engn, Beijing 100191, Peoples R China

3.Beijing Res Ctr Agr Stand & Testing, Beijing 100097, Peoples R China

4.Chinese Acad Sci, Inst Chem, CAS Key Lab Mol Nanostruct & Nanotechnol, Beijing Natl Lab Mol Sci BNLMS, Beijing 100190, Peoples R China

5.Univ Chinese Acad Sci, Coll Mat Sci & Optoelect Technol, Ctr Mat Sci & Optoelect Engn, Beijing 100049, Peoples R China

6.Univ Chinese Acad Sci, CAS Ctr Excellence Topol Quantum Computat, Beijing 100049, Peoples R China

7.Univ Chinese Acad Sci, CAS Key Lab Vacuum Phys, Beijing 100049, Peoples R China

8.Peking Univ, Shenzhen Grad Sch, Sch Chem Biol & Biotechnol, Guangdong Key Lab Nanomicro Mat Res, Shenzhen 518055, Peoples R China

关键词： crystallization kinetics; lead-free; perovskite solar cells; pre-nucleation clusters; tin

期刊名称：ANGEWANDTE CHEMIE-INTERNATIONAL EDITION （ 影响因子：15.336； 五年影响因子：14.205 ）

ISSN： 1433-7851

年卷期： 2021 年 60 卷 7 期

页码：

收录情况： SCI

摘要： Tin halide perovskites are rising as promising materials for lead-free perovskite solar cells (PSCs). However, the crystallization rate of tin halide perovskites is much faster than the lead-based analogs, leading to more rampant trap states and lower efficiency. Here, we disclose a key finding to modulate the crystallization kinetics of FASnI(3) through a non-classical nucleation mechanism based on pre-nucleation clusters (PNCs). By introducing piperazine dihydriodide to tune the colloidal chemistry of the FASnI(3) perovskite precursor solution, stable clusters could be readily formed in the solution before nucleation. These pre-nucleation clusters act as intermediate phase and thus can reduce the energy barrier for the perovskite nucleation, resulting in a high-quality perovskite film with lower defect density. This PNCs-based method has led to a conspicuous photovoltaic performance improvement for FASnI(3)-based PSCs, delivering an impressive efficiency of 11.39 % plus improved stability.

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