Conductivity Mechanism of Cs-Sb-Type Photoemissive Cathode Film

概要

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For analyzing the long tail of a spectral response curve of a Cs-Sb-type photocathode, we propose that the Cs-Sb-type photocathode is conveniently interpreted on the basis of an amorphous semiconductor like concept. 1) In a spectral response of photoemission, a gentle exponential tail exists in the long-wavelength region. It is possible to explain this phenomenon by the existence of interband states. 2) At low temperatures, the electrical resistivity has a temperature dependence of T^<-1/4>. This behavior implies that the cathode film has an amorphous-type conductivity: i.e., variable-range hopping conduction. This is futher evidence of the amorphous like interband states which limit the photoemission.
社団法人応用物理学会の論文
1990-09-20