Spectral dependence of the internal photoeffect in acetylenic semiconductors.
The spectral dependence of the internal photoeffect and the optical absorption were measured for polymers prepared by oxidative polydehydrocondensation of p-nitrophenylacetylene and either 9, 10-diethynyl anthracene-polyvinyl carbazole or p-diethynylbenzene-polyvinyl carbazole. Similar measurements were made on Cu(I) phenylacetilide-polyvinyl carbazole. In most cases, the photosensitivity and the optical absorption did not correlate well, suggesting that surface effects may be important. This possibility was explored further through studies of spectral reflection and electrophotographic sensitivity and also of the spectral distribution of the longitudinal photocurrent as a function of electric field. The results, which confirm the role of surface effects, can be interpreted by a model of DeVore based on the influence of enhanced surface recombination (caused by low carrier mobility).
Sidaravicius
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