Novel Insight into the Role of Chlorobenzene Antisolvent Engineering for Highly Efficient Perovskite Solar Cells: Gradient Diluted Chlorine Doping

Lili Yang; Yanbo Gao; Yanjie Wu; Xiangxin Xue; Fengyou Wang; Yingrui Sui; Yunfei Sun; Maobin Wei; Xiaoyan Liu; Huilian Liu

doi:10.1021/acsami.8b17338

Novel Insight into the Role of Chlorobenzene Antisolvent Engineering for Highly Efficient Perovskite Solar Cells: Gradient Diluted Chlorine Doping

ACS Appl Mater Interfaces. 2019 Jan 9;11(1):792-801. doi: 10.1021/acsami.8b17338. Epub 2018 Dec 26.

Authors

Lili Yang^{1

2}, Yanbo Gao^{1

2}, Yanjie Wu^{1

2}, Xiangxin Xue^{1

2}, Fengyou Wang^{1

2}, Yingrui Sui^{1

2}, Yunfei Sun^{1

2}, Maobin Wei^{1

2}, Xiaoyan Liu^{1

2}, Huilian Liu^{1

2}

Affiliations

¹ Key Laboratory of Functional Materials Physics and Chemistry of the Ministry of Education , Jilin Normal University , Changchun 130013 , China.
² National Demonstration Center for Experimental Physics Education , Jilin Normal University , Siping 136000 , PR China.

PMID: 30520296
DOI: 10.1021/acsami.8b17338

Abstract

Chlorobenzene and diethyl ether were chosen as an antisolvent to control the crystallization of CH₃NH₃PbI₃. Under the condition of similar crystallization for both perovskite films, the obvious larger short-circuit current density for CH₃NH₃PbI₃ film treated by chlorobenzene prompted us to unveil the roles of chlorobenzene in the perovskite films via adjusting the dropping amount of chlorobenzene. A novel insight of chlorobenzene function was revealed, that is, gradient diluted chlorine doping in the CH₃NH₃PbI₃ film, which forms a gradient band gap in the perovskite films, prompts photogenerated carriers accumulating at the interface, makes the electron transport faster, and effectively enhances the power conversion efficiency (PCE) of solar cells. The maximum PCE of 20.58% has been achieved under standard AM1.5 conditions. Moreover, this technique exhibits very high reproducibility, and 20 devices fabricated in one batch can yield an average PCE of 20.31%.

Keywords: antisolvent treatment; crystal quality; gradient doping; perovskite solar cells; power conversion efficiency.