Year: 2005
Type: article
Abstract: We fabricated GaAs and GaInAs solar cells with a large cell area of 5×5 cm2 as the first step toward their practical use. The 5×5 cm2 cells showed high conversion efficiencies equivalent to those of 1×1 cm2 cells owing to both a good uniformity of epitaxial film characteristics in a 3-inch wafer and the reduction of the series resistance of grid electrodes. Moreover, a higher conversion efficiency of 26.0% under 1-sun air-mass 1.5 global conditions was achieved for the 5×5 cm2 GaAs cell by optimizing the antireflection coating. This is the highest efficiency among GaAs cells ever reported. The 5×5 cm2 GaInAs cell showed an efficiency of 4.2% as the bottom cell under a GaAs top cell. Therefore, a conversion efficiency of more than 30% can be expected for the 5×5 cm2 GaAs/GaInAs mechanically stacked tandem cell.
DOI: 10.1143/jjap.44.l985
Institution: Sumitomo Electric Industries (Japan)
Language: English
Subfield: Electrical and Electronic Engineering
Field: Engineering
Domain: Physical Sciences
Open Access status: bronze
OpenAlex ID: W2003458209