$5\times 5$ cm2 GaAs and GaInAs Solar Cells with High Conversion Efficiency

概要

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We fabricated GaAs and GaInAs solar cells with a large cell area of $5\times 5$ cm2 as the first step toward their practical use. The $5\times 5$ cm2 cells showed high conversion efficiencies equivalent to those of $1\times 1$ 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 $5\times 5$ cm2 GaAs cell by optimizing the antireflection coating. This is the highest efficiency among GaAs cells ever reported. The $5\times 5$ 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 $5\times 5$ cm2 GaAs/GaInAs mechanically stacked tandem cell.
INSTITUTE OF PURE AND APPLIED PHYSICSの論文
2005-07-10