Antisolvent-Free Heterogenous Nucleation Enabled by Employing 4-Tert-Butyl Pyridine Additive and Two-Step Annealing for Efficient CsPbI2Br Perovskite Solar Cells

被引:3
作者
Gu, Xiaoyu [1 ,2 ]
Shan, Chengwei [1 ,2 ]
Xu, Xiaowei [1 ,2 ]
Liu, Qian [1 ,2 ]
Kyaw, Aung Ko Ko [1 ,2 ]
机构
[1] Southern Univ Sci & Technol, Guangdong Univ Key Lab Adv Quantum Dot Displays &, Shenzhen 518055, Peoples R China
[2] Southern Univ Sci & Technol, Dept Elect & Elect Engn, Shenzhen 518055, Peoples R China
基金
中国国家自然科学基金;
关键词
all-inorganic perovskite solar cells; crystallization regulation; heterogenous crystallization; lewis acid-base adduct; INORGANIC PEROVSKITE; PERFORMANCE;
D O I
10.1002/smll.202307840
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
All inorganic perovskite based on CsPbI2Br has attracted significant attention due to its relatively thermal stable structure compare to its hybrid counterparts. With a wide bandgap of 1.9 eV and excellent light absorption capability, it has been extensively explored for applications in indoor photovoltaics and as a front absorber in tandem devices. However, the uncontrollable crystallization process during solvent evaporation and thermal annealing leads to both macroscopic defects like cracks and microscopic defects such as voids. In this study, a metastable adduct with lead (II) halides by incorporating 4-tert-butyl pyridine as a volatile Lewis base monodentate ligand in the precursor solution is formed. The strategic preferential decomposition of the adduct during the early-stage low-temperature annealing facilitated the desorption of lead (II) halides, inducing antisolvent-free heterogenous nucleation. This, in turn, promoted crystal growth during subsequent high-temperature annealing, resulting in dense films with low defect density. As a result, a maximum open-circuit voltage of 1.30 V is achieved with the champion power conversion efficiency of 16.5% in CsPbI2Br-based perovskite solar cell. The work reveals a new mechanism of using Lewis acid-base adduct to obtain high quality perovskite films other than hindering crystallization in traditional way.
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页数:9
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