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- Title
Unusual dependence of the effectiveness of spectral sensitization of the photoconductivity of polycrystalline ZnO on the dye concentration in a mixed monolayer on a semiconductor surface.
- Authors
Savvin, Yu. N.; Tolmachev, A. V.; Yanovskii, V. V.; Koval’, A. V.
- Abstract
A nonmonotonic, oscillatory dependence of the effectiveness of spectral sensitization of the photoconductivity of polycrystalline ZnO on the dye concentration in n-octadecylamine and stearic acid monolayers, transferred to the surface of a semiconductor by the Langmuir–Blodgett method, has been observed experimentally. The observed effect is completely different from the monotonic increase of the photocurrent with a peak at some dye concentration in certain films adsorbed on a semiconductor surface from a solution and in films deposited in vacuum. To explain the results, a simple model describing the balance of monomers and dimers of the dye is examined. The solution of the problem is an oscillatory decaying function of the monomer concentration as the total dye concentration in the monolayer increases. © 1996 American Institute of Physics.
- Subjects
ZINC oxide; POLYCRYSTALS; PHOTOCONDUCTIVITY
- Publication
JETP Letters, 1996, Vol 64, Issue 3, p186
- ISSN
0021-3640
- Publication type
Article
- DOI
10.1134/1.567172