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A compositional grading layer between the p-In0.5Ga0.5P emitter layer and p-In0.5Al0.5P window layer in the p+-n In0.5Ga0.5P solar cell is investigated numerically. With the insertion of the grading layer, the short-circuit current density and conversion efficiency are improved due to the enhancement of carrier-collection efficiency, which can be ascribed to the reduction of potential barrier height...
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