NOVELTY - A photovoltaic cell (600) comprises transparent conductor layer, heterojunction partner layer (208), p-type cadmium selenide layer in contact with heterojunction partner layer, and electrical contact layer.    USE - A photovoltaic cell for module of hybrid multi-junction photovoltaic cells (claimed) used for providing electric power to hand-held calculators and space vehicles.    ADVANTAGE - Forming heterojunction partner layer of high resistivity zinc compound including zinc oxide and zinc magnesium oxide improves high temperature durability of photovoltaic cell to withstand higher processing temperatures. The multi-junction photovoltaic cell has smaller energy loss; higher output voltage, thus reducing quantity of photovoltaic cells that must be electrically connected in series to provide required output voltage and reduce monolithic integration cost and area of module lost; reduced output current required to power given load; reduced resistive losses, thus increasing efficiency of solar cell and module; and lower temperature coefficient, thus reducing power loss of photovoltaic cell at elevated operating temperatures.    DETAILED DESCRIPTION - INDEPENDENT CLAIMS are included for:    (1) a hybrid multi-junction photovoltaic cell;    (2) a module of hybrid multi-junction photovoltaic cells;    (3) manufacture of p-type cadmium selenide semiconductor material and photovoltaic device, comprising depositing cadmium selenide layer; coating cadmium selenide layer with solution comprising solvent and chloride(s) of Group IA elements, IB elements, and/or Group IIIB elements; heating at 300-500 degrees C for 3.5 hours while at least partially preventing evaporation of selenium from cadmium selenide layer; and    (4) formation of hybrid multi-junction photovoltaic cell.    DESCRIPTION OF DRAWING(S) - The drawing shows a cross-sectional view of a photovoltaic cell.    Electromagnetic energy (102)    Substrate (202)    Back contact layer (204)    Solar absorber layer (206)    Photovoltaic cell (600)