Effect of excessive Pb content in the precursor solutions on the properties of the lead acetate derived CH3NH3PbI3 perovskite solar cells

被引：28
作者：
Chen, Yuanqing [1 ,2 ]
Yerramilli, Aditya [1 ]
Shen, Yuxia [1 ]
Zhao, Zhao [1 ]
Alford, Terry [1 ,3 ]
机构：
[1] Arizona State Univ, Sch Matter Transportat & Energy, Tempe, AZ 85282 USA
[2] Xian Univ Technol, Dept Mat Phys & Chem, Xian 710048, Shaanxi, Peoples R China
[3] African Univ Sci & Technol, Mat Sci Program, Abuja, Fct, Nigeria
来源：
SOLAR ENERGY MATERIALS AND SOLAR CELLS | 2018年 / 174卷
关键词：
Perovskite solar cells; Lead acetates; Precursor solution; Power conversion efficiency; ORGANOMETAL HALIDE PEROVSKITES; EFFICIENT; PASSIVATION; TEMPERATURE; PERFORMANCE;
D O I：
10.1016/j.solmat.2017.09.039
中图分类号：
TE [石油、天然气工业]; TK [能源与动力工程];
学科分类号：
0807 ; 0820 ;
摘要：
Organic inorganic CH3NH3PbI3 (MAPbI(3)) inverted structured perovskite films were prepared using Pb (CH3COO)(2) (Pb(OAc)(2)) and CH3NH3I (MAI) as source materials. The structural, optical and photoelectronic properties of the MAPbI(3) films varied with the Pb(OAc)(2)/MAI molar ratio. It was found that the Pb(OAc)(2)/MAI molar ratio greatly influenced the structure and morphology of the MAPbI(3) films. A suitable amount of excessive Pb(OAc)(2) (about 5 mol% excessive Pb) in the solution made the film smoother with improved film crystallinity. This resulted in enhanced power conversion efficiency (PCE). However, for films derived from solution with low Pb(OAc)(2)/MAI or high Pb(OAc)(2)/MAI ratio, defects such as pits or pinholes were easily formed with low crystallinity, and hence decreased the lifetime of the carriers and photoelectrical properties of the final solar cells. Using a solution with 5% excessive Pb, inverted structured CH3NH3PbI3 perovskite solar cells with PCE of nearly 14% were obtained.
引用
收藏
页码：478 / 484
页数：7
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