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Journal of the Optical Society of America

Journal of the Optical Society of America

  • Vol. 54, Iss. 4 — Apr. 1, 1964
  • pp: 486–491

Sensitization of Photoconduction in a Zinc Oxide Film by Eosin

S. J. DUDKOWSKI and L. I. GROSSWEINER  »View Author Affiliations

JOSA, Vol. 54, Issue 4, pp. 486-491 (1964)

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The electrical conductivity in a zinc oxide thin film is increased by light absorption in an adjacent layer of eosin (Na). Activation spectra show that response is excited by irradiation in the eosin monomer and dimer absorption bands and in the long wavelength tail induced by the zinc oxide substrate. The photo-response in bilayers varies with the one-half power of the illuminance, builds up and decays by first-order processes, and is proportional to the zinc oxide dark current. The temperature dependence approximately follows the zinc oxide dark conductivity. Measurements with voltaic couples show that charge transfer takes place across the interface. Possible mechanisms are discussed.

S. J. DUDKOWSKI and L. I. GROSSWEINER, "Sensitization of Photoconduction in a Zinc Oxide Film by Eosin," J. Opt. Soc. Am. 54, 486-491 (1964)

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  1. The subject of photographic sensitization is reviewed by W. West, J. Chem. Phys. 66, 2398 (1962).
  2. A review of organic dye photoconduction is given by H. Inokuchi and H. Akamatu, Solid State Phys. 12, 133–136 (1961).
  3. A. G. Gol'dman and I. A. Akimov, Zh. Fiz. Khim. 27, 355 (1938).
  4. R. C. Nelson, J. Chem. Phys. 29, 388 (1958).
  5. E. Putzeiko and A. Terenin, Zh. Fiz. Khim. 23, 676 (1949); Dokl. Akad. Nauk SSSR 70, 401 (1950); ibid. 90, 1005 (1953).
  6. E. K. Putzeiko, Dokl. Akad. Nauk SSSR 129, 303 (1959) [Soviet Phys.—Doklady 4, 1268 (1959–60)].
  7. Y. Hishiki, H. Tamura, S. Namba, and K. Taki, Rept. Inst. Phys. Chem. Res. (Tokyo) 36, 386 (1960).
  8. S. Namba and Y. Hishiki, Rept. Inst. Phys. Chem. Res. (Tokyo) 39, 27 (1963).
  9. The zinc films were evaporated on an invisible copper sublayer, which had essentially infinite electrical resistance. Check experiments with a heavy copper base corroborated that diffusion of copper was not involved in sensitization. Granular zinc oxide films evaporated directly on ground glass also showed sensitization by eosin with qualitatively similar properties.
  10. L. Koch, J. Assoc. Offic. Agr. Chemists 39, 397 (1956).
  11. The photoconductivity of zinc oxide thin films is reviewed by G. Heiland, E. Mollwo, and F. Stöckmann, Solid State Physics, edited by F. Seitz and D. Turnbull (Academic Press Inc., New York, 1959), Vol. 8, pp. 191–323.
  12. R. C. Nelson, J. Opt. Soc. Am. 46, 13 (1956); ibid. 51, 1182 (1961).
  13. N. Petruzzella and R. C. Nelson, J. Chem. Phys. 37, 3010 (1962).
  14. This mechanism is reviewed by R. H. Bube, Photoconductivity of Solids (John Wiley & Sons, Inc., New York, 1960), pp. 171–174.
  15. H. Weiss, Z. Physik 132, 335 (1952).
  16. A model for the fast photoconductivity of ZnO films based on hole capture by interstitial zinc was proposed by E. Mollwo, Photoconductiwity Conference, edited by R. G. Breckenridge et al. (John Wiley & Sons, Inc., New York, 1956), pp. 509–528.
  17. The chemical reactivity of triplet eosin is reviewed by L. I. Grossweiner in the Proceedings of the International Symposium on Physical Processes in Radiation Biology (Academic Press Inc., New York) (to be published).
  18. F. Wilessow and A. Terenin, Naturwiss. 46, 167 (1959).
  19. R. C. Nelson, J. Opt. Soc. Am. 51, 1186 (1961).

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