Photovoltaic space power - Status and future

The key elements of spacecraft photovoltaic cell and array design are identified and discussed. Requirements governed by the choice of mission such as total power, insolation, temperature, radiation environment, and stowed volume are discussed with respect to the solar cell parameters important to that mission (conversion efficiency, weight, tolerance to the space radiation environment, cost, and availability). Array parameters (dollars per watt, watts per kilogram, watts per square meter) are discussed for three types of arrays (rigid, lightweight flexible and concentrator). Progress hi cell efficiencies are noted with a record GalnP/GaAs cell efficiency of 26.9%. Recent advances hi thin film cells, CIS and amorphous silicon, are discussed. Manufacturing capability and progress in multibandgap cells is noted. Space photovoltaics can look forward to an exciting next ten years as the demand for a variety of satellites continues to grow.