Proceedings of Asia-Pacific International Conference on Perovskite, Organic Photovoltaics and Optoelectronics (IPEROP27)
Publication date: 22nd October 2026
Ag/Cu-Bi-S-based materials have recently garnered significant attention due to their good stability, low toxicity, and excellent potential optoelectronic properties. In this study, we systematically investigate the crystal structures, photophysical properties, and charge transport behaviors of four bismuth-based sulfochlorides (AgBiSCl2, CuBiSCl2, AgBiS2, and BiSCl) for their high-quality bulk polycrystals. Time-resolved microwave conductivity (TRMC) reveals the outstanding photoconductive characteristics of BiSCl and AgBiS2, which significantly outperform typical Bi-based halides . In contrast, AgBiSCl2 and CuBiSCl2 exhibit low photoconductivity despite their dispersive band structures. Temperature-dependent TRMC reveals that BiSCl has distinct band conduction characteristics governed by phonon scattering, whereas AgBiS2 has trivial temperature dependence associated with impurity scattering. Furthermore, a complex photoconductivity analysis elucidates that both BiSCl and AgBiS2 include a larger contribution of free carriers than that of trapped carriers, which is beneficial for charge transport. This work presents the first comprehensive photoconductivity measurements and analyses of the different bismuth-based sulfur-chlorine semiconductors, providing a mechanistic insight into their potential optoelectronic applications.
The authors thank Dr. Fumitaka Ishiwari at Tokyo Metropolitan University and Mr. Luo Hao at The University of Osaka for the fruitful discussions and experimental assistance. K. Z. acknowledges financial support from China Scholarship Council program (Project ID: 202408530133).
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