Enhanced Performance of Perovskite Solar Cells with Zinc Chloride Additives

Junjie Jin; Hao Li; Cong Chen; Boxue Zhang; Lin Xu; Biao Dong; Hongwei Song; Qilin Dai

doi:10.1021/acsami.7b15310

Enhanced Performance of Perovskite Solar Cells with Zinc Chloride Additives

ACS Appl Mater Interfaces. 2017 Dec 13;9(49):42875-42882. doi: 10.1021/acsami.7b15310. Epub 2017 Dec 1.

Authors

Junjie Jin¹, Hao Li¹, Cong Chen¹, Boxue Zhang¹, Lin Xu¹, Biao Dong¹, Hongwei Song¹, Qilin Dai²

Affiliations

¹ State Key Laboratory on Integrated Optoelectronics, College of Electronic Science and Engineering, Jilin University , 2699 Qianjin Street, Changchun 130012, People's Republic of China.
² Department of Physics, Atmospheric Sciences and Geoscience, Jackson State University , Jackson, Mississippi 39217, United States.

PMID: 29168634
DOI: 10.1021/acsami.7b15310

Abstract

Perovskite solar cells (PSCs) have attracted extensive attention due to their impressive photovoltaic performance. The quality of the perovskite layer is very critical to achieve high device performance. Here, we explore the partial substitution of PbI₂ by ZnCl₂ in the preparation of CH₃NH₃PbI₃ and its effects on perovskite morphology, optical properties, and photovoltaic performance. Consequently, the device with 3% ZnCl₂ shows great improvement in power conversion efficiency (PCE) from 16.4 to 18.2% compared to that of the control device. Moreover, the device is more stable than the control device, with only 7% degradation after aging for 30 days. These results are attributed to the increased grain size, improved film morphology, and reduced recombination loss after the partial substitution of PbI₂ by ZnCl₂ in the perovskite film. This work develops a new approach for morphology control through rational additives in the perovskite film, and paves the way toward further enhancing the device performances of PSCs including PCE and stability.

Keywords: ZnCl2 additives; larger grain; nonradiative recombination; perovskite solar cells; stability.