Is the photoelectric effect possible for semiconductors?
I imagine that this might be, if possible, a two-photon process: excitation of an electron from a filled to conductance band, and then on to ejection. Is anyone familiar with such materials, or even whether this is possible?
I can't readily think of a theoretical reason against it. Two-photon events are often less likely than one-photon, however I could imagine irradiation by a laser of bandwith covering both the band-gap wavelength and that necessary for ejection would do it.
If it does indeed happen, I'd be glad to hear a short summary of how it differs from the photoelectric effect of metals.