Research on Photovoltaic Cells for Laser Light on wireless energy transmission

Abstract

Photovoltaic cells generating electricity by laser can be used to transmit power by light instead of electricity, which can guarantee the energy supply of SAR satellites under special working conditions. This paper studied high efficiency and high open voltage three-junction GaAs laser cells. Cell's window layer, emission region, grid line and antireflection were adjusted to reduce the surface recombination rate and reflex, in order to increase the absorption rate and the current density. Broadband gap AlGaAs/GaInP tunnel junction was designed to adapt the characteristics of the laser and solve the match problem of sub-cell. The IV curve of the laser photovoltaic cell was tested under 808nm laser irradiation. The open-circuit voltage and conversion efficiency are 3.25V and 53.6% under 0.67W/cm2 light intensity. Through research on new multi-junction laser photovoltaic cells, SAR satellites and other spacecrafts have more options for their energy supply when solar arrays don't work.