Abstract

A number of factors are known to influence greatly the photoelectrical and the electrophotographical properties of zinc oxide powder. Some of them, such as the degree of zinc excess and the state—species and amount—of chemisorbed oxygen, are in most cases uncontrollable, in the sense that they are almost determined at the time of manufacturing, unless some drastic treatment is imposed on samples before use. While some other factors such as the surface doping can be used to improve or control behaviors of samples at the time of use, these factors seem to be intimately related to the hard-to-control ones. After a brief review of studies of the oxygen states on zinc oxide surface, a diicussion is developed concerning the photoconductive properties and the electrophotographic charge acceptance of zinc oxide bearing various degrees of zinc excess The potential barrier at the surface of microcrystals, the height of which is estimated from dark conductivities gives a good measure for the charge acceptance. Further, based upon the conventional theory of barrier development by oxygen chemisorption, the photo-to-dark conductivity ratio is argued in terms of the donor density the barrier height, and other factors.

© 1969 Optical Society of America

Investigation of the Electrophotographic Properties of ZnO Single Crystals

H. Kiess
Appl. Opt. 8(S1) 100-105 (1969)

Experiments on Dye Sensitization of Zinc Oxide

K. Hauffe, V. Martinez, H. Pusch, J. Range, R. Schmidt, and R. Stechemesser
Appl. Opt. 8(S1) 34-41 (1969)

Measurement on Work Function of Polycrystalline Zinc Oxide Covered by Organic Dye

Shinichi Kikuchi, Yasusuke Takahashi, and Toshifumi Sakata
Appl. Opt. 8(S1) 42-44 (1969)

Electron Paramagnetic Resonance Studies of Dye-Sensitized Zinc Oxide Layers

Simon Larach and John Turkevich
Appl. Opt. 8(S1) 45-49 (1969)

A Study of the Discharge Mechanism of ZnO

F. Schelfaut and W. Maenhout-Van der Vorst
Appl. Opt. 8(S1) 96-99 (1969)