Radiation‐Hard and Ultralightweight Polycrystalline Cadmium Telluride Thin‐Film Solar Cells for Space Applications

Abstract Achieving high‐specific‐power and radiation hardness of solar cells is of great importance to perform tasks and achieve duration in space. Therefore, we investigated the proton irradiation resistance of ultralightweight CdS/CdTe thin film solar cells having high specific power values. High‐energy proton beams (15 MeV) with doses ranging from 1×10 12 to 1×10 15 cm −2 were used, equivalent to more than 2000 years in low Earth orbit. Although 70 % decrease in cell conversion efficiency was observed after proton irradiation with dose of 1×10 15 cm −2 , it still maintained the photovoltaic performance. The specific power of the fabricated cell decreased from 358 W kg −1 to 109 W kg −1 after proton irradiation (dose=1×10 15 cm −2 ), which is still comparable to specific powers of other types of solar cells. Our work indicated that reduction of short circuit current is a major factor o…