The objective of this modeling investigation is to optimize a solar cell tandem device under the AM1.5G spectrum, based InGaN cells for concentration ratio. In this paper describes the role of the concentration photovoltaic in InGaN dual-junction solar cell. this study, the top cell is made of InGaN (1.64 eV) while the bottom cell is made of InGaN (0.94 eV).the reported for purpose was to extracted the solar cell parameters(photocurrent, open circuit voltage and efficiency) in a fairly wide range of concentration levels (1 to30 sun).Our calculation shows that the efficiency can be improved from (23.87%) for a tandem solar cell with (X=1sun) up to (25.72%) for same device solar cell with (X=30sun) for AM.1.5 illumination and room temperature.
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