Comparison Of GaAs (III-Vsemiconductors) And Si Vertical Multijunction Solar Cells, As The Converters In The Power Beaming Systems

In electricity transmission systems by the laser radiation, the GaAs photovoltaic converters with more than 50% efficiency are used. Recently the VMJ also has been studied for the monochromatic light conversion into the electricity. Here, these technologies and their application in electricity transmission systems, have been studied and evaluated. The processing method, structure and conversion efficiency have been compared. Results prove that VMJ silicon solar cells along with concentrator have the high conversion efficiency equal to 43% for the monochromatic light with 975 nm wavelength. Although the GaAs cells along with concentratorhave the 58.3% conversion efficiency. Considering the complexity and processing costs the silicon cells have the better situation, however if the concentratoris presented in production process, there is not considerable difference between them.