Preparation of Highly Efficient and Stable All-Inorganic CsPbBr3 Perovskite Solar Cells Using Pre-Crystallization Multi-Step Spin-Coating Method

被引:2
|
作者
Zhang, Yulong [1 ]
Jiang, Zhaoyi [2 ]
Li, Jincheng [1 ]
Meng, Guanxiong [3 ]
Guo, Jiajun [3 ]
Zhang, Weijia [4 ]
机构
[1] Officers Coll PAP, Dept Basic Courses, Chengdu 610213, Peoples R China
[2] Taiyuan Univ Sci & Technol, Sch Appl Sci, Taiyuan 610213, Peoples R China
[3] Hangzhou Acme Optoelect Technol Co Ltd, Hangzhou 310020, Peoples R China
[4] Beihang Univ, Ctr Condensed Matter & Mat Phys, Sch Phys, Beijing 100191, Peoples R China
关键词
perovskite solar cells; sequential deposition; CsPbBr3; highly efficient and stability; porous PbBr2; FILMS;
D O I
10.3390/coatings14070918
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
All-inorganic CsPbBr3 perovskite solar cells have garnered extensive attention in the photovoltaic domain due to their remarkable environmental stability. Nevertheless, CsPbBr3 prepared using the conventional sequential deposition method suffers from issues such as inferior crystallinity, low phase purity, and poor film morphology. Herein, we propose a pre-crystallization methodology by introducing a minute quantity of CsBr into the PbBr2 precursor solution to generate a small amount of CsPb2Br5 crystals within the PbBr2 film, leading to a porous PbBr2 film with enhanced crystallinity. Under the influence of more pores and CsPb2Br5 crystals as nucleation sites for inducing growth, a CsPbBr3 film with a larger crystal size, lower grain boundary density, stronger crystallinity, and higher phase purity is formed. Compared with untreated devices, photovoltaic devices prepared using the pre-crystallization method achieved a champion photovoltaic conversion efficiency (PCE) of 8.62%. Furthermore, pre-crystallized devices demonstrate higher stability than untreated ones and can still retain 94% of the original PCE after being exposed to air for 1000 h without encapsulating.
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页数:11
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