Key points are not available for this paper at this time.
Photons of energy hν>3.5 ev eject external photoelectrons from the valence bands of the semiconductors Cs2Te and Rb2Te with a quantum efficiency as high as 30 percent. Fundamental optical absorption sets in roughly at this same point. These materials are similar to Cs3Sb, except that they have forbidden energy zones almost twice as wide. Consistent with this, energy distributions show no evidence for electron-electron scattering up to hν=6.7 ev. These substances are interesting for ultraviolet photometry.
Taft et al. (Sun,) studied this question.