Advancing Silver Bismuth Sulfide Quantum Dots for Practical Solar Cell Applications.

Colloidal quantum dots (CQDs) show unique properties that distinguish them from their bulk form, the so-called quantum confinement effects. This feature manifests in tunable size-dependent band gaps and discrete energy levels, resulting in distinct optical and electronic properties. The investigation direction of colloidal quantum dots (CQDs) materials has started switching from high-performing materials based on Pb and Cd, which raise concerns regarding their toxicity, to more environmentally friendly compounds, such as AgBiS. After the first breakthrough in solar cell application in 2016, the development of AgBiS QDs has been relatively slow, and many of the fundamental physical and chemical properties of this material are still unknown. Investigating the growth of AgBiS QDs is essential to understanding the fundamental properties that can improve this material's performance. This review comprehensively summarizes the synthesis strategies, ligand choice, and solar cell fabrication of AgBiS QDs. The development of PbS QDs is also highlighted as the foundation for improving the quality and performance of AgBiS QD. Furthermore, we prospectively discuss the future direction of AgBiS QD and its use for solar cell applications.