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Wouldn't the semiconductor only be able to accept photons at one wavelength?

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    $\begingroup$ Why not photons with more energy than its bandgap? The extra energy would be lost to phonons. $\endgroup$ – xXx_69_SWAG_69_xXx Jan 21 at 1:12
  • $\begingroup$ That makes sense. Would the phonon be the result of an electron having extra kinetic energy, thus causing a disturbance in the material? $\endgroup$ – sad_scientist Jan 21 at 2:54
  • $\begingroup$ Consider that even molecules do have broad band absorption. Having bands instead of levels means even more broadening. $\endgroup$ – Alchimista Jan 21 at 10:48
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Any valence electron as far as energy is concerned can move to anywhere in the conduction band. These bands are quite broad and so there is a broad range of acceptabel transition energies.

http://www.yambo-code.org/wiki/index.php?title=Silicon

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