Crystallization Kinetics Modulation of FASnI 3 Films with Pre‐nucleation Clusters for Efficient Lead‐Free Perovskite Solar Cells
Autor: | Shihe Yang, Nan Jiang, Yizhi Qu, Ming-Hua Li, Hui Huang, Yunfei Li, Haining Chen, Jin-Song Hu, Xiangyue Meng, Ding-Jiang Xue |
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Rok vydání: | 2020 |
Předmět: |
Materials science
010405 organic chemistry Interface and colloid science Photovoltaic system Nucleation Halide Perovskite solar cell chemistry.chemical_element General Medicine General Chemistry 010402 general chemistry 01 natural sciences Catalysis 0104 chemical sciences chemistry Chemical engineering Phase (matter) Tin Perovskite (structure) |
Zdroj: | Angewandte Chemie International Edition. 60:3693-3698 |
ISSN: | 1521-3773 1433-7851 |
Popis: | 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 FASnI3 through a non-classical nucleation mechanism based on pre-nucleation clusters (PNCs). By introducing piperazine dihydriodide to tune the colloidal chemistry of the FASnI3 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 FASnI3 -based PSCs, delivering an impressive efficiency of 11.39 % plus improved stability. |
Databáze: | OpenAIRE |
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