Giant improvement of performances of perovskite solar cells via component engineering

Qingbo Wei; Dongpu Chang; Zhangwen Ye; Xue Li; Lingxing Zan; Loujun Gao; Feng Fu; Dong Yang

doi:10.1016/j.jcis.2020.12.046

Giant improvement of performances of perovskite solar cells via component engineering

J Colloid Interface Sci. 2021 Apr 15:588:393-400. doi: 10.1016/j.jcis.2020.12.046. Epub 2020 Dec 17.

Authors

Qingbo Wei¹, Dongpu Chang¹, Zhangwen Ye¹, Xue Li¹, Lingxing Zan¹, Loujun Gao¹, Feng Fu¹, Dong Yang²

Affiliations

¹ Key Laboratory of Chemical Reaction Engineering of Shaanxi Province, College of Chemistry & Chemical Engineering, Yan'an University, Yan'an 716000, PR China.
² Materials Science and Engineering, Penn State, University Park, PA 16802, USA. Electronic address: dzy82@psu.edu.

PMID: 33422788
DOI: 10.1016/j.jcis.2020.12.046

Abstract

The absorption layer is a crucial factor for high-performance perovskite solar cells. In this work, the influence of the two components, methylammonium iodide (MAI) and formamidinium iodide (FAI) on the morphology, optical absorption and photovoltaic performances was systematically investigated. The results revealed that the surface morphologies of MAI/FAI based perovskite films were rougher, and the grain sizes became larger with increasing the FAI concentration. UV-Vis and photoluminescence spectra showed that there was a red shift with enhancing the FAI concentration. By the effective doping of FAI into the pristine MAI based perovskite film, the formation of a δ-FAPbI₃ was successfully inhibited. As a result, the power conversion efficiency (PCE) of the perovskite solar cells based on mixed absorption layers was improved by about 27% compared to the pristine MAI based perovskite device.

Keywords: Component engineering; Morphology; Perovskite; Solar cells.