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Semiconductor Electronic: Material, Devices And Simple Circuits — Physics STD 12 Science — Question

Rajasthan BoardEnglish MediumSTD 12 SciencePhysicsSemiconductor Electronic: Material, Devices And Simple Circuits2 Marks
Question
State the reason, why $GaAs$ is most commonly used in making a solar cell.
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Answer

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

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