A photovoltaic cell contains a p–n junction that that converts
solar light to electricity. An optimum semiconductor
would have its band-gap energy matched to the wavelength
of maximum solar intensity at the Earth’s surface.
(b) Which of the following semiconductors absorb at a
wavelength matched with maximum solar intensity?
CdTe with a band-gap energy of 145 kJ/mol or ZnSe
with a band-gap energy of 248 kJ/mol.
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