Question

State the reason , why Ga As is most commonly used in making a solar cell.

Answer 1

For solar cell , incident photon energy must be greater than band gap energy, i.e., $(hV>Eg)$ . For Ga As , $Eg=1.43eV=1.43eV$ and high optical absorption $\approx 104c{m}^{-1}$ , which are main criteria for fabrication of solar cells.