A 19% efficient AlGaAs solar cell with graded band gap

Abstract
An Al0.20Ga0.80As solar cell with a band gap graded from 1.64 eV at the junction to 1.72 eV at the surface has been fabricated using metalorganic chemical vapor deposition. An efficiency of 19.2% has been measured under 1-sun, AM2 simulated conditions with an open circuit voltage of 1.18 V, a short circuit density of 14.5 mA/cm2, and a fill factor of 0.83.

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