Sparkling hot spots in perovskite solar cells under reverse bias
Weiqi Li,
Keqing Huang,
Jianhui Chang,
Caiqi Hu,
Caoyu Long,
Hai Zhang,
Xavier Maldague,
Biao Liu,
Jianqiao Meng,
Yuxia Duan,
Junliang Yang
Affiliations
Weiqi Li
School of Physics and Electronics, Central South University, Changsha 410083, China
Keqing Huang
School of Physics and Electronics, Central South University, Changsha 410083, China
Jianhui Chang
School of Physics and Electronics, Central South University, Changsha 410083, China
Caiqi Hu
School of Physics and Electronics, Central South University, Changsha 410083, China
Caoyu Long
School of Physics and Electronics, Central South University, Changsha 410083, China
Hai Zhang
Computer Vision and Systems Laboratory, Department of Electrical and Computer Engineering, Université Laval, 1065, av. de la Médecine, Québec (QC), Canada G1V 0A6
Xavier Maldague
Computer Vision and Systems Laboratory, Department of Electrical and Computer Engineering, Université Laval, 1065, av. de la Médecine, Québec (QC), Canada G1V 0A6
Biao Liu
School of Physics and Electronics, Central South University, Changsha 410083, China
Jianqiao Meng
School of Physics and Electronics, Central South University, Changsha 410083, China
Yuxia Duan
School of Physics and Electronics, Central South University, Changsha 410083, China; Corresponding authors.
Junliang Yang
School of Physics and Electronics, Central South University, Changsha 410083, China; Corresponding authors.
Perovskite solar cells (PSCs) are attracting much attention and are on the way to commercialization. However, some modules are subject to reverse bias in actual fields, so it is meaningful to investigate the reverse-bias behavior of PSCs. Herein, an in-situ temperature and current measurement technique was developed. Intriguingly, some hot spots were observed and then quickly disappeared in the reverse biased PSCs, along with the simultaneous increase in the current and local temperature. Also, the potential mechanism has been revealed and analyzed. An abnormal bulge in the perovskite film was found at the hot spot. Accordingly, the appearance and disappearance of hot spots were perfectly explained by band bending and tunneling current caused by ion accumulation. Additionally, statistical analysis suggested that sparkling hot spots were related to reverse voltage and efficiencies of PSCs. The research provides a great significance for the study of PSCs under reverse bias.
