STUDIES IN ZINC OXIDE PHOTOCONDUCTIVITY.
Final technical rept.,
GULF GENERAL ATOMIC INC SAN DIEGO CALIF
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A study of the gas evolved or adsorbed from an electrophotographic ZnO ZZZ-661, a spectroscopically pure ZnO SP-500, and a commercial Electrofax paper when irridated by ultraviolet UV has been carried out using gas chromatographic techniques. Some studies of the photoconductivity of ZnO were also carried out using ac conductivity techniques. On the ZnO samples studied, O2 desorption was never observed, but only adsorption. Further, on ZnO ZZZ-661, in addition to O2 adsorption, CO2 was produced. No CO2 was observed on either the SP-500 or the paper samples. The origin of the CO2 appears to be a carbonaceous impurity, probably present in the ZZZ-661 as a carbon-oxygen complex. The electrical conductivity studies were not readily interpretable because they did not conform to the simple Debye model involving bulk and surface regions of differing conductivity. Actual printing experiments showed that, as found by others, O2 was necessary to cause charging. Ozone was not effective in charging the electrophotographic paper for printing. Author