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Which of the following materials cannot be used as solar cells materials?

(a) Si

(b) GaAs

(c) CdS

(d) PbS

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Correct option is (d) PbS

To elaborate: If we use PbS as the solar cell material, then most of the solar radiation will be absorbed on the top-layer of the solar cell and will not reach in the depletion zone.

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