Recent Advances on Solution-phase Synthesis of Metal Chalcohalide Nanocrystals

Chalcohalide nanocrystals have attracted significant attention as promising candidates for the fabrication of novel electronic and optoelectronic devices. Chalcohalide exhibit high charge carrier mobility, defect tolerance, strong absorption characteristics, and tunable optical and electrical properties owing to their unique electronic configurations and diverse compositions. Specifically, chalcohalide nanocrystals synthesized via solution-phase enable tunability of uniform size, shape, and composition, and offer colloidal stability when dispersed in various solvents. Solution-processable chalcohalide nanocrystals offer a simple and cost-effective route for device fabrication while preserving their unique size and shape-dependent properties. This review represents the recent advances in the solution-phase synthesis of metal chalcohalide nanocrystals and their applications in solution-processed device fabrication. This review sequentially presents synthesis methods, including solvothermal, hot-injection, and heat-up methods, followed by a detailed description of the optical and structural properties of the nanocrystals. Furthermore, a concise overview of optoelectronic device applications, such as photodetectors and solar cells, which utilize chalcohalide nanocrystals, is provided.