Gallium Selenide for solar energy applications is a p-type or absorber layer material. CIGS-based photovoltaic cells (PV Cells) for solar energy are fabricated from a positively charged or p-type Gallium doped Copper Indium Selenide (CIGS) layer underneath a negatively charged or n-type layer. The p-type layer can be partially produced from Gallium Selenide Single Crystal sold under the AE Solar Energy group. Most CIGS-based PV solar cells are produced from thin film deposition of CIGS layers.