Abstract
The demands for space solar cells are continuously increasing with the rapid development of space technologies and complex space missions. The space solar cells are facing more critical challenges than before: higher conversion efficiency and better radiation resistance. Being the main power supply in spacecrafts, III-V multijunction solar cells are the main focus for space application nowadays due to their high efficiency and super radiation resistance. In multijunction solar cell structure, the key to obtaining high crystal quality and increase cell efficiency is satisfying the lattice matching and bandgap matching conditions. New materials and new structures of high efficiency multijunction solar cell structures are continuously coming out with low-cost, lightweight, flexible, and high power-to-mass ratio features in recent years. In addition to the efficiency and other properties, radiation resistance is another sole criterion for space solar cells, therefore the radiation effects of solar cells and the radiation damage mechanism have both been widely studied fields for space solar cells over the last few decades. This review briefly summarized the research progress of III-V multijunction solar cells in recent years. Different types of cell structures, research results and radiation effects of these solar cell structures under different irradiation conditions are presented. Two main solar cell radiation damage evaluation models—the equivalent fluence method and displacement damage dose method—are introduced.
Highlights
Space solar cells, being the most important energy supply unit, have been employed in spacecrafts and satellites for over sixty years since the first satellite was launched in 1958 [1]
The results showed that this type of cell structure possesses superior radiation resistance comparing to the traditional lattice matched multijunction solar cell
It was found that the crossover from GaInP current-limited subcell to GaAs currentlimited subcell occurs at 2 × 1015 e/cm2 for the 1 MeV electrons [90]. This result indicated that advanced triple junction solar cells with current matching at end of life (EOL) can be achieved by reducing the amount of beginning of life (BOL) current mismatch, which is helpful for designing high efficiency radiation hardened space solar cells
Summary
The demands for space solar cells are continuously increasing with the rapid development of space technologies and complex space missions. The space solar cells are facing more critical challenges than before: higher conversion efficiency and better radiation resistance. Being the main power supply in spacecrafts, III-V multijunction solar cells are the main focus for space application nowadays due to their high efficiency and super radiation resistance. In multijunction solar cell structure, the key to obtaining high crystal quality and increase cell efficiency is satisfying the lattice matching and bandgap matching conditions. New materials and new structures of high efficiency multijunction solar cell structures are continuously coming out with low-cost, lightweight, flexible, and high power-to-mass ratio features in recent years. This review briefly summarized the research progress of III-V multijunction solar cells in recent years.
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