Dominant Processing Factors in Two-Step Fabrication of Pure Sulfide CIGS Absorbers

Pure sulfide CIGS solar cells are interesting candidates for standalone or top in a tandem configuration. To understand the limits and improve power conversion efficiency of these devices, comprehensive approach aimed at composition, interface, process engineering should be employed. Here, latter was explored. Using two-step fabrication technique one-variable-at-a-time methodology, we found four processing factors affecting absorber most. While two were already backed by previous literature, new statistical evidence other important as well. The impact alkali barrier diffusion also established with significance under various conditions. Furthermore, roughness samples without indicated significant negative linear correlation devices’ efficiency. This contribution could aid engineers more efficient designs.