The stability issue of perovskite solar cells is the greatest bottleneck on the way to commercialization. Here, we report the degradation mechanism of perovskite solar cells (PSCs) with inverted structure of fluorine-doped tin oxide (FTO)/Cu:NiOx/MAPbI3/PC61BM/Ag. The oxidative degradation of PC61BM electron transport layer forms pinholes and leads to the water-catalyzed decomposition of perovskites. The formation of silver iodide confirms the iodine is from decomposition of perovskites. The instability of inverted PSCs based on Cu:NiOx is owing to corrosive behavior of silver electrode. In addition, we find that a small amount of bromine doping in the perovskite material can delay the corrosion of the silver electrode. This paper demonstrates it is essential to deeply understand the degradation mechanism of the devices and a small amount of bromine doping is a feasible strategy to suppress the corrosion of the silver electrodes.
|Number of pages||5|
|Journal||IEEE Journal of Photovoltaics|
|State||Published - Jul 2019|
Bibliographical noteFunding Information:
Manuscript received January 25, 2019; revised February 28, 2019; accepted March 29, 2019. Date of publication April 29, 2019; date of current version June 19, 2019. This work was supported in part by the National Natural Science Foundation of China under Grants 61421002, 61874150, 61574029, and 61471085, and in part by the University of Kentucky. (Hao Li and Ruihan Yang contributed equally to this work.) (Corresponding author: Ping Zhang.) H. Li, R. Yang, C. Wang, Y. Wang, H. Chen, H. Zheng, D. Liu, T. Zhang, F. Wang, P. Gu, P. Zhang, and S. Li are with the School of Optoelectronic Science and Engineering, State Key Laboratory of Electronic Thin Films and Integrated Devices, University of Electronic Science and Technology of China, Chengdu 610054, China (e-mail: firstname.lastname@example.org; email@example.com; firstname.lastname@example.org; email@example.com; firstname.lastname@example.org; 1505741729 @qq.com; email@example.com; firstname.lastname@example.org; 961789645@qq. com; email@example.com; firstname.lastname@example.org; email@example.com).
© 2019 IEEE.
- Air stability
- bromine doping
- perovskite solar cells
- silver electrode corrosion
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics
- Electrical and Electronic Engineering