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A monolithic Al0.93Ga0.07As/GaAs solar cell array has been demonstrated. It consists of four adjacent 0.1×0.55-cm cells connected in electrical series with an etched groove isolation and metal interconnect scheme. With 819.5 W/m2 incident solar radiation, it exhibits an open-circuit voltage of 3.96 V, short-circuit current of 1.01 mA, and a fill factor of 0.625. The observed efficiency of 13.85% appears to be limited by the mechanisms of contact resistance and interconnect area.
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P. Borden (1979) studied this question.
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