CBSE Class 12 · 2008 · All India · SemiconductorsVery Short Answer

State the reason why GaAs is most commonly used in making of a solar cell.

Solution

A good solar-cell material should absorb a large fraction of incident solar radiation near the surface.
Gallium arsenide (GaAs) has a high absorption coefficient and a band gap (~1.4 eV) well suited to the peak of the solar spectrum, so it converts incident light to electrical energy very efficiently.

High absorption coefficient and suitable band gap.

CBSE Class 12 Board · 2008 · All India · Subjective

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