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Question

Why GaAs is preferred over Si in a solar cell?

A
Because GaAs is easily available
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B
Because GaAs has relatively higher absorption coefficient
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C
Because GaAs has lower energy gap
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D
Because GaAs is cheaper
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Solution

The correct option is B Because GaAs has relatively higher absorption coefficient
When subjected to radiation exposure, a GaAs cell is more resistant than a silicon cell due to its direct band gap and resultant high photon absorption coefficient. As such, less film thickness is required in the GaAs cell to absorb solar radiation.

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