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When a beam ray respectively a photon creates an electron-hole pair in a semiconductor, e.g. for silicon the ionization energy is 3.6 eV, is the electron then directly in the conduction band? So does this photon energy 3.6 ionize and lift the electron up?

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  • $\begingroup$ If you give an electron at the top of the valence band at k=0 the 3.6eV from a photon, yes, it will go straight up to the conduction band at k=0, forming an electron-hole pair, yes. You should go find Pankove in your local library... $\endgroup$ – Jon Custer Aug 19 '19 at 22:05
  • $\begingroup$ @JonCuster, isn't that an answer, albeit brief, rather than a comment? $\endgroup$ – Alfred Centauri Aug 19 '19 at 22:45
  • $\begingroup$ @AlfredCentauri - well, Ben has been asking a number of variations on this, with one of his questions actually showing the transition in question. The formation of an electron-hole pair is covered well in many introductory texts. $\endgroup$ – Jon Custer Aug 19 '19 at 23:15

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