A High-efficiency LPE GaAs Solar Cell at Concentrations Ranging from 2000 to 4000 Suns

摘要

III-V solar cells for terrestrial concentration applications are currently becoming of greater and greater interest. From our experience, concentrations higher than 1000 suns are required with these cells to reduce PV electricity cost to such an extent that this alternative could become cost competitive. In this paper, a single-junction p GaAs solar cell is with efficiencies of 238 and 22.5 percent at concentration ratios of 2700 and 3600 suns respectively, is presented. This GaAs solar cell is well suited for use with non-imaging optical concentrators, which possess a large aperture angle. Low-temperature liquid phase epitaxy (LTLPE) has been the growing technique for the semiconductor structure as an attempt to use a simplified, cheap and clean technique, within a renewable energy perspective. The GaAs solar cell presented is compared with the highest efficiency tandem solar cells at concentration levels exceeding 1000 suns. The GaAs solar cell performance maintains high efficiencies up to 4000 suns, while tandem cells seem to drop very quickly after reaching their maximum. Therefore, single junction GaAs solar cells are a good candidate for operating at very high concentrations, and LPE is able to supply these high-quality solar cells to work within terrestrial concentration systems, the main objective of which is the reduction of PV electricity costs.