Investigation of Cation Exchange Behaviors of FAxMA1-xPbI3 Films Using Dynamic Spin-Coating

Hyang Mi Yu; Byeong Geun Jeong; Dae Young Park; Seong Chu Lim; Gon Namkoong; Mun Seok Jeong

doi:10.3390/ma14216422

Investigation of Cation Exchange Behaviors of FA_xMA_1-xPbI₃ Films Using Dynamic Spin-Coating

Materials (Basel). 2021 Oct 26;14(21):6422. doi: 10.3390/ma14216422.

Authors

Hyang Mi Yu¹, Byeong Geun Jeong¹, Dae Young Park², Seong Chu Lim^{1

3}, Gon Namkoong^{1

4}, Mun Seok Jeong^{2

5}

Affiliations

¹ Department of Energy Science, Sungkyunkwan University, Suwon 16419, Korea.
² Department of Physics, Hanyang University, Seoul 04763, Korea.
³ Department of Smart Fab. Technology, Sungkyunkwan University, Suwon 16419, Korea.
⁴ Applied Research Centre, Department of Electrical and Computer Engineering, Old Dominion University, 12050 Jefferson Avenue, Newport News, VA 23693, USA.
⁵ Department of Energy Engineering, Hanyang University, Seoul 04763, Korea.

Abstract

In this study, we fabricated and characterized uniform multi-cation perovskite FA_xMA_1-xPbI₃ films. We used the dynamic spin-coating method to control the cation ratio of the film by gradually increasing the FA+, which replaced the MA+ in the films. When the FA+ concentration was lower than xFA ~0.415 in the films, the stability of the multi-cation perovskite improved. Above this concentration, the film exhibited δ-phase FAPbI₃ in the FA_xMA_1-xPbI₃ films. The formation of δ-phase FAPbI₃ disturbed the homogeneity of the photoluminescence spatial distribution and suppressed the absorption spectral bandwidth with the increasing bandgap. The precise control of the cation ratio of multi-cation perovskite films is necessary to optimize the energy-harvesting performance.

Keywords: FA cations; FAxMA1−xPbI3; MA cations; cation exchange; dynamic spin-coating; δ-phase FAPbI3.