The experimental research on electron radiation resistance of GaAs / Ge solar cells is the basic research project of high performance solar power for aerospace applications. The total radiation of this kind of solar cells was tested, such as 1 x 1013e / cm2, 1 x 10114e / cm2, 6 x 1014e / cm2, 1 x 10115e / cm2 and 1.69x 1015e / cm2. Under the radiation of 1 x 1015e / cm2, the open circuit voltage, short circuit current and conversion efficiency decreased by 9.27%, respectively, After electron radiation, the long wave rectangular spectral response of the solar cells declines more. The deep level transient spectrum analysis shows that 0.42 EV and 0.43 EV deep levels are introduced into the band gap. In order to improve the radiation resistance of gaas solar cells, the fabrication process should be improved, the uniformity of each semiconducting layer of the solar cells should be improved, the junction depth of the gaas solar cell should be reduced and the thickness of the effective part of the solar cell should be reduced.
GaAs solar cells have the advantages of high conversion efficiency, high temperature resistance and radiation resistance. However, due to its high price, they can only be used as spacecraft energy. Spacecraft is always in the radiation environment composed of charged particles in space, which is affected by the bombardment of charged particles, the irradiation of ultraviolet light and the alternating temperature, resulting in the degradation of the characteristics of gaas solar cells on spacecraft.
The space radiation environment consists of the earth radiation belt, solar cosmic rays and galactic cosmic rays. The earth radiation is divided into Van Allen radiation belt and artificial radiation belt. The inner and outer radiation belts of the artificial radiation belt are mainly composed of protons and electrons. When a solar flare occurs, a large number of high-energy charged particles are emitted, which are called solar cosmic rays. Most of these charged particles are made up of protons. Galactic cosmic rays are energetic charged particles from all directions of the galaxy, most of which are protons.