Effects of potassium treatment on SnO2 electron transport layers for improvements of perovskite solar cells

被引：36

作者：

Kim, SeongYeon ^{[1
,2
,3
]}

Zhang, Fei ^{[2
]}

Tong, Jinhui ^{[2
]}

Chen, Xihan ^{[2
]}

Enkhbayar, Enkhjargal ^{[1
]}

Zhu, Kai ^{[2
]}

Kim, JunHo ^{[1
]}

机构：

[1] Incheon Natl Univ, Dept Phys, Incheon 22012, South Korea

[2] Natl Renewable Energy Lab, Chem & Nanosci Ctr, Golden, CO 80401 USA

[3] Daegu Gyeongbuk Inst Sci & Technol DGIST, Res Ctr Thin Film Solar Cells, Daegu 42988, South Korea

来源：

SOLAR ENERGY | 2022年 / 233卷

关键词：

SnO2; Perovskite; Solar cell; Defect passivation; K treatment; Electron transport layer; EFFICIENT; PERFORMANCE;

D O I：

10.1016/j.solener.2022.01.053

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：

SnO2 has been studied intensively as an electron transport layer (ETL) for highly efficient metal halide perovskite solar cells. However, SnO2 ETL frequently exhibits defect-related issues associated with the bulk SnO2 and the perovskite/SnO2 interface, and to passivate the defect states potassium ion has been used. In order to investigate the passivation effect of potassium ion, we carried out KCl treatment on the solution-processed SnO2 ETL. It was found that KCl-treatment shifted up conduction band maximum and Fermi energy of SnO2, and reduced the band gap of perovskite absorber by K+ diffusion, which resulted in a better conduction band alignment at perovskite/SnO2. Admittance spectroscopy revealed that diffused K+ ions can passivate defects of the perovskite absorber layer. With the improvement of band alignment and defect passivation via the KCl treatment, the J-V hysteresis was almost eliminated and power conversion efficiency was much enhanced with improved open-circuit voltage and fill factor.

引用

收藏

页码：353 / 362

页数：10

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