Effects of Beam Conditions in Ground Irradiation Tests on Degradation of Photovoltaic Characteristics of Space Solar Cells

We investigated the effects of irradiation beam conditions on performance degradation silicon and triple-junction solar cells for use in space. The fluence rates electron proton beams were varied. Degradation did not depend rate protons both cells. A higher electrons caused greater Si cell, but dependence was due to temperature increase during irradiation. Two beam-area expansion methods, defocusing scanning, examined various energies (50 keV–10 MeV). In comparing output from with defocused scanned beams, no significant difference found any energy. plan reflect these findings into ISO standard test method space