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The characteristics of GaAs solar cells after 200 hours of annealing at 400–450 °C are reported. The room-temperature reflectivity and external quantum efficiency (EQE) are unchanged after such heat treatments, and peak EQE values of 90% are observed both before and after. At an operating temperature of 400 °C, the performance of annealed cells was only slightly worse than cells that had not undergone...
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