Polyacrylonitrile-Coordinated Perovskite Solar Cell with Open-Circuit Voltage Exceeding 1.23 V

Chen Chen; Xiao Wang; Zhipeng Li; Xiaofan Du; Zhipeng Shao; Xiuhong Sun; Dachang Liu; Caiyun Gao; Lianzheng Hao; Qiangqiang Zhao; Bingqian Zhang; Guanglei Cui; Shuping Pang

doi:10.1002/anie.202113932

Polyacrylonitrile-Coordinated Perovskite Solar Cell with Open-Circuit Voltage Exceeding 1.23 V

Angew Chem Int Ed Engl. 2022 Feb 14;61(8):e202113932. doi: 10.1002/anie.202113932. Epub 2021 Dec 30.

Authors

Chen Chen¹, Xiao Wang¹, Zhipeng Li¹, Xiaofan Du¹, Zhipeng Shao¹, Xiuhong Sun¹, Dachang Liu^{1

2}, Caiyun Gao¹, Lianzheng Hao^{1

2}, Qiangqiang Zhao¹, Bingqian Zhang¹, Guanglei Cui^{1

3}, Shuping Pang^{1

2}

Affiliations

¹ Qingdao Institute of Bioenergy and Bioprocess Technology, Chinese Academy of Sciences, Qingdao, 266101, P. R. China.
² Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing, 100049, P. R. China.
³ China School of Future Technology, University of Chinese Academy of Sciences, Beijing, 100049, P. R. China.

PMID: 34882937
DOI: 10.1002/anie.202113932

Abstract

In solution-processed organic-inorganic halide perovskite films, halide-anion related defects including halide vacancies and interstitial defects can easily form at the surfaces and grain boundaries. The uncoordinated lead cations produce defect levels within the band gap, and the excess iodides disturb the interfacial carrier transport. Thus these defects lead to severe nonradiative recombination, hysteresis, and large energy loss in the device. Herein, polyacrylonitrile (PAN) was introduced to passivate the uncoordinated lead cations in the perovskite films. The coordinating ability of cyano group was found to be stronger than that of the normally used carbonyl groups, and the strong coordination could reduce the I/Pb ratio at the film surface. With the PAN perovskite film, the device efficiency improved from 21.58 % to 23.71 % and the open-circuit voltage from 1.12 V to 1.23 V, the ion migration activation energy increased, and operational stability improved.

Keywords: Lead; Open-circuit voltage; Perovskites; Polyacrylonitrile; Solar Cells.