Wurtzite CuIn(SSe_1-)₂ Nanocrystals: Colloidal Synthesis and Band-Gap Engineering

CuIn(SSe_1-)₂ nanocrystals as an emerging class of functional materials present huge potential for industrial applications; however, the synthesis of CuIn(SSe_1-)₂ nanocrystals remains a formidable challenge in achieving both tunable band gap and phase. Here, we reported a facile hot-injection method for synthesizing a family of wurtzite CuIn(SSe_1-)₂ nanocrystals, enabling manipulation of the S and Se contents across the entire compositional range (0 ≤ x ≤ 1). The obtained nanocrystals exhibit band gaps ranging from 1.21 to 1.58 eV, which vary depending on the S/Se ratios in the products. This approach can be readily extended to other scenarios involving chalcogenide nanomaterials, thereby facilitating the advancement of next-generation functional materials and applications.