Generic water-based spray-assisted growth for scalable high-efficiency carbon-electrode all-inorganic perovskite solar cells

Zeyang Zhang; Yanshuang Ba; Dandan Chen; Junxiao Ma; Weidong Zhu; He Xi; Dazheng Chen; Jincheng Zhang; Chunfu Zhang; Yue Hao

doi:10.1016/j.isci.2021.103365

Generic water-based spray-assisted growth for scalable high-efficiency carbon-electrode all-inorganic perovskite solar cells

iScience. 2021 Oct 28;24(11):103365. doi: 10.1016/j.isci.2021.103365. eCollection 2021 Nov 19.

Authors

Affiliations

¹ State Key Discipline Laboratory of Wide Band Gap Semiconductor Technology & Shaanxi Joint Key Laboratory of Graphene, School of Microelectronics, Xidian University, Xi'an, Shaanxi 710071, PR China.
² College of Science, Xi'an Shiyou University, Xi'an, Shaanxi 710065, PR China.

Abstract

A water-based spray-assisted growth strategy is proposed to prepare large-area all-inorganic perovskite films for perovskite solar cells (PSCs), which involves in spraying of cesium halide water solution onto spin-coating-deposited lead halide films, followed by thermal annealing. With CsPbBr₃ as an example, we show that as-proposed growth strategy can enable the films with uniform surface, full coverage, pure phase, large grains, and high crystallinity, which primarily benefits from the controllable CsBr loading quantity, and the use of water as CsBr solvent makes the reaction between CsBr and PbBr₂ immune to PbBr₂ film microstructure. As a result, the small-area (0.09 cm²) and large-area (1.00 cm²) carbon-electrode CsPbBr₃ PSCs yield the record-high efficiencies of 10.22% and 8.21%, respectively, coupled with excellent operational stability. We also illustrate that the water-based spray-assisted deposition strategy is suitable to prepare CsPbCl₃, CsPbIBr₂, and CsPbI₂Br films with outstanding efficiencies of 1.27%, 10.44%, and 13.30%, respectively, for carbon-electrode PSCs.

Keywords: Devices; Engineering; Materials application.