Evaluation and prediction of the degradation of space Si solar cells induced by a low-earth-orbit radiation environment

Abstract：

Space-graded silicon solar cells are evaluated by 1 MeV and 2 MeV electron-irradiation. The mean degradation of the maximum power ( P _max) is presented and analyzed. The degradation at both electron energies has been correlated with the displacement damage dose ( D _d). A good linearity between the electron D _dand the mean P _maxdegradation is obtained. The concept of D _dhas also been used to predict the Si solar cell response in a low-earth-orbit (Altitude 799 km, Inclination 99 ^o) radiation environment, considering the shielded effect of a 120 μ m-thick silica coverglass on reducing the radiation. Compared with the on-orbit data from a Si solar array of a Chinese satellite (duration from April 2007 to July 2010), a good match can be found between the on-orbit data and the predicted results using D _dmethodology, indicating the method is appropriate for evaluating the radiation damage of the solar cells, and also to provide a new technique for studying radiation effects on the optoelectronic detectors used in many high energy physics applications, where harsh radiation environments produce damage in optoelectronic device materials.