Issue 8, 2025

Eco-friendly bismuth halide chalcogenide perovskites for solar energy harvesting

Abstract

The quest to eliminate lead (Pb) content in perovskite photovoltaic materials has significantly shifted focus towards identifying viable Pb-free alternatives. This study provides a comprehensive theoretical investigation of CH3NH3BiI2Se and CH3NH3BiI2S as Pb alternative candidates. Density Functional Theory (DFT) calculations and the solar cell capacitance simulator (SCAPS) were used. The DFT analysis reveals that both CH3NH3BiI2Se and CH3NH3BiI2S possess indirect band gaps of 1.35 eV and 1.39 eV, respectively. CH3NH3BiI2Se demonstrates a higher absorption coefficient, stronger absorption in the UV-visible regions, a broader absorption spectrum and better charge carrier mobilities compared to CH3NH3BiI2S. CH3NH3BiI2Se and CH3NH3BiI2S based solar cells which show 24.06% and 21.85% power conversion efficiencies (PCEs), respectively. This study emphasizes the potential of CH3NH3BiI2Se as a promising bismuth mixed halide chalcogenide compound for the development of sustainable perovskite solar cells. The findings provide a foundation for the guided design of novel bismuth chalcogenide compounds for optoelectronic applications and experimental studies.

Graphical abstract: Eco-friendly bismuth halide chalcogenide perovskites for solar energy harvesting

Article information

Article type
Paper
Submitted
31 Oct 2024
Accepted
03 Mar 2025
First published
04 Mar 2025

Sustainable Energy Fuels, 2025,9, 2197-2206

Eco-friendly bismuth halide chalcogenide perovskites for solar energy harvesting

J. T. Sanjeewani Thakshila Jayawardane, U. K. Don Muditha Akmal, D. Hu, P. K. Wijesekara Abeygunawardhana and G. A. Sewvandi, Sustainable Energy Fuels, 2025, 9, 2197 DOI: 10.1039/D4SE01523A

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