Highly Bright Colloidal Gallium-Doped CuInS2 Quantum Dots for Luminescent Solar Concentrators

Abstract

We have developed an efficient strategy to improve the brightness and stability of CuInS₂ quantum dots via Ga³⁺ doping combined with the overgrowth of ZnS shell. The incorporation of Ga³⁺ in crystal lattices greatly suppresses the diffusion of Cu⁺ and reduce the formation of Cu-related defects, leading to a photoluminescence quantum yield as high as 92%. These nanocrystals can be integrated into luminescent solar concentrators and the devices exhibit a power conversion efficiency reaching 3.87%.