M. I. Ustinova, G. V. Shilov, D. V. Korchagin, P. A. Troshin, S. M. Aldoshin, L. A. Frolova, “Towards stable wide-bandgap perovskite absorbers: controlling light-induced halide phase segregation in CsPbI<sub>2</sub>Br through partial lead substitution”, Mendeleev Commun., 2025, Volume 35, Issue 5,Pages <nobr>573

Communications

Towards stable wide-bandgap perovskite absorbers: controlling light-induced halide phase segregation in CsPbI₂Br through partial lead substitution

M. I. Ustinova^ab, G. V. Shilov^a, D. V. Korchagin^a, P. A. Troshin^ca, S. M. Aldoshin^a, L. A. Frolova^a

^a Federal Research Center of Problems of Chemical Physics and Medicinal Chemistry, Russian Academy of Sciences, 142432 Chernogolovka, Moscow Region, Russian Federation
^b Centre for Hybrid and Organic Solar Energy, Department of Electronic Engineering, University of Rome Tor Vergata, 00133 Rome, Italy
^c Zhengzhou Research Institute, Harbin Institute of Technology, 450003 Zhengzhou, China

Abstract: The photostability of CsPb_0.95M_0.1/nI2Br films modified with 30 different substituent Mⁿ⁺ cations was systematically investigated. It was shown for the first time that light-induced halide phase segregation in CsPbI₂Br perovskite films could be completely suppressed by partial replacement of Pb²⁺ with rationally selected cations: Sr²⁺, Sn²⁺, In³⁺ and Bi³⁺. The obtained results open the door for the development of photostable wide-bandgap perovskite semiconductors required for high-efficiency tandem solar cells.

Keywords: perovskite solar cells, CsPbI₂Br, all-inorganic perovskite absorber, phase stability, photostability, partial lead substitution, halide phase segregation, long-term stability.

Received: 24.12.2024
Accepted: 03.03.2025

Language: English

DOI: 10.71267/mencom.7698

	*Supplementary materials:*
		Supplementary_data_1.pdf	661.7 Kb