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Unformatted text preview: photon with an energy near a semiconductor band gap has almost zero momentum. An important process is called radiative recombination, where an electron in the conduction band annihilates a hole in the valence band, releasing the excess energy as a photon. If the electron is near the bottom of the conduction band and the hole is near the top of the valence band, this process is possible in a direct band gap semiconductor, but impossible in an indirect band gap one, because conservation of crystal momentum would be violated. Q3 a) AlAsxSb1‐x: x = 0.57 GaAsxSb1‐x: x = 0.52 GaxIn1‐xAs: x = 0.46 b) AlAsxSb1‐x: Since this cannot be found in table 7.11, no poi...
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