Abstract

Photons of energy <i>h</i>ν>3.5 ev eject external photoelectrons from the valence bands of the semiconductors Cs<sub>2</sub>Te and Rb<sub>2</sub>Te with a quantum efficiency as high as 30 percent. Fundamental optical absorption sets in roughly at this same point. These materials are similar to Cs<sub>3</sub>Sb, 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 <i>h</i>ν = 6.7 ev. These hv substances are interesting for ultraviolet photometry.

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