A structure of CdS/Cu_xS quantum dots sensitized solar cells

This work introduces a type of CdS/Cu_xS quantum dots (QDs) as sensitizers in quantum dot sensitized solar cells by in-situ cationic exchange reaction method where CdS photoanode is directly immersed in CuCl₂ methanol solution to replace Cd²⁺ by Cu²⁺. The p-type Cu_xS layer on the surface of the CdS QDs can be considered as hole transport material, which not only enhances the light harvesting of photoanode but also boosts the charge separation after photo-excitation. Therefore, both the electron collection efficiency and power conversion efficiency of the solar cell are improved from 80% to 92% and from 1.21% to 2.78%, respectively.