Fabrication et caractérisation des nanostructures à base des oxydes métalliques pour des applications photovoltaïques

Abstract

This work aims to optimize the electrochemical, structural, morphological and optical properties of Cu2O/ZnO heterojunctions and to improve their performance by applying various strategies, such as inserting a ZnS buffer layer and engineering ZnO window layers using Mg/Al co-doping. First, we deposited the Cu2O/ZnS/ZnO heterojunctions by combining electrodeposition and chemical bath deposition techniques. The effect of the ZnS buffer layer at different bath temperatures (75, 80, 85 and 90°C) on the properties and efficiency of the heterojunctions was studied. Then, we deposited Cu2O nanostructures by electrodeposition on FTO substrates coated with undoped ZnO and Mg/Al co-doped ZnO by two different methods, electrodeposition and chemical bath deposition. The results revealed a significant improvement in the structural, morphological, and optical properties of MAZO, and an increase in the photoresponse for the corresponding heterojunctions. These results represent a good starting point for developing high-performance and low-cost solar cells.