Simultaneous Contact and Grain-Boundary Passivation in Planar Perovskite Solar Cells Using SnO2-KCl Composite Electron Transport Layer

被引:412
作者
Zhu, Pengchen [1 ]
Gu, Shuai [1 ]
Luo, Xin [1 ,2 ]
Gao, Yuan [1 ]
Li, Songlin [2 ]
Zhu, Jia [1 ]
Tan, Hairen [1 ]
机构
[1] Nanjing Univ, Coll Engn & Appl Sci, Natl Lab Solid State Microstruct, Jiangsu Key Lab Artificial Funct Mat, Nanjing 210093, Jiangsu, Peoples R China
[2] Nanjing Univ, Sch Elect Sci & Engn, Nanjing 210093, Jiangsu, Peoples R China
基金
中国国家自然科学基金;
关键词
defect passivation; electron transport layer; perovskite solar cells; HALIDE PEROVSKITES; HIGH-EFFICIENCY; PERFORMANCE;
D O I
10.1002/aenm.201903083
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
The performance of perovskite solar cells is sensitive to detrimental defects, which are prone to accumulate at the interfaces and grain boundaries of bulk perovskite films. Defect passivation at each region will lead to reduced trap density and thus less nonradiative recombination loss. However, it is challenging to passivate defects at both the grain boundaries and the bottom charge transport layer/perovskite interface, mainly due to the solvent incompatibility and complexity in perovskite formation. Here SnO2-KCl composite electron transport layer (ETL) is utilized in planar perovskite solar cells to simultaneously passivate the defects at the ETL/perovskite interface and the grain boundaries of perovskite film. The K and Cl ions at the ETL/perovskite interface passivate the ETL/perovskite contact. Meanwhile, K ions from the ETL can diffuse through the perovskite film and passivate the grain boundaries. An enhancement of open-circuit voltage from 1.077 to 1.137 V and a corresponding power conversion efficiency increasing from 20.2% to 22.2% are achieved for the devices using SnO2-KCl composite ETL. The composite ETL strategy reported herein provides an avenue for defect passivation to further increase the efficiency of perovskite solar cells.
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页数:7
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