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Why si and gaas are preferred material for solar cells

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In solar cells photo excitation takes place when energy of radiation is greater than energy band of the intensity for solar radiation. However in case of GaAs the energy band gap in nearly 1.53 which is slightly greater than the maximum intensity for solar radioation . but is it used because of its relatively higher abosorption coefficient.
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A solar cell

Assertion (A) : Si and GaAs are preferred materials for solar cells Reason (R ) : Energy gap of Si is 1.1 eV and that of GaAs is 1.53 eV which gives maximum irradiance where as other materials like CdS or CdSe (E_(g) = 2.4 eV) and PbS (E_(g) = 0.4 eV) given minimum irradiance.

Why are Si and GaAs are preferred materials for solar cells?

What is solar cell why are Si and Ga as preferred materials for solar cell give its V-I characteristics ]

Why are Si and Ga As preffered materials for solar cells?

MODERN PUBLICATION-SEMICONDUCTOR ELECTRONICS METERIALS DEVICES AND SIMPLE CIRCUITS -CONCEPUAL QUESTIONS
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