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论文类型：期刊论文

发表时间：2021-03-26

发表刊物：ACS APPLIED ENERGY MATERIALS

卷号：3

期号：8

页面范围：8017-8025

ISSN号：2574-0962

关键字：Electrochemical impedance spectroscopy; perovskite solar cell; electromigration; thermal; bias

摘要：With the rapidly increasing development in photovoltaics, perovskite solar cells (PSCs) have become a star in this field. The intrinsic characteristics of perovskites have been deeply researched, but because of the soft property of perovskites and sensitivity to the environment, the interfacial electrical properties in PSCs still need to be carefully investigated. Herein, real-time dynamic tracking of the interfacial electrical property evolution in PSCs under coeffective thermal and electrical effects was studied by electrochemical impedance spectroscopy. The results indicated that the thermal effect would lead to ion migration and impede charge transfer at interfaces. In addition, the bias-induced electromigration would be accelerated under the thermal effect and enhanced with increasing temperature. Furthermore, from cross-sectional scanning electron microscopy images of PSCs with different test conditions, it can be concluded that the coeffect of the long-term electromigration process and the thermal effect would greatly weaken the electrical properties of the perovskite and thus promote the degradation process of PSCs, which starts from the interfacial grain boundaries. These findings shed light on the degradation mechanism because of the coeffective thermal and electrical effects on the interfacial evolution of PSCs, which is vital for improving the stability of PSCs.