Rafik ZOUACHE2023-12-202023-12-202023http://dspace.univ-msila.dz:8080//xmlui/handle/123456789/41769This thesis investigates three key aspects of CIGS solar cells. The first part explores simulations of substrate CIGS solar cell structure using Back Surface Field (BSF) layer, as well as the multi-junction solar cells based on Copper Gallium Selenide (CGS) and Copper Indium Gallium Selenide (CIGS), such as tandem and triple-junction solar cells. The second section examines the impact of the Ordered Defect Compound (ODC) layer and the activation energy levels EA and ED on the performance of CIGS and CIS solar cells using SILVACO/Atlas-2D software. The final section concentrates on the deposition process of high-quality CIGS thin films using rf-magnetron sputtering technique. The obtained films are subjected to investigation of their structural, morphological and optical properties through some techniques such as X-ray diffraction (XRD) analysis, Atomic Force microscopy (AFM) and Fourier transform infrared spectroscopy (FTIR), respectivelySolar cell, CIGS, BSF, Efficiency, Trap levels, ODC layer, rf-Magnetron SputteringThesis