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Photosensitization of ZnO nanostructured thin films with organic dyes

C. TAZLAOANU1, L. ION1, G. SOCOL2, M. SOCOL3, I. N. MIHAILESCU2, F. STANCULESCU1, I. ENCULESCU3, F. IONESCU3, L. MAGHERUŞAN1, S. ANTOHE1,*

Affiliation

  1. University of Bucharest, Faculty of Physics, RO-077125 Măgurele-Ilfov, POB MG-11, Romania
  2. National Institute for Plasma Physics, RO-077125 Măgurele-Ilfov, Romania
  3. National Institute for Materials Physics, RO-077125 Măgurele-Ilfov, Romania

Abstract

We report in this contribution on the photosensitization effect of ZnO nanostructured thin films with copper-phthalocyanine (CuPc). ZnO films were prepared by pulsed laser deposition (PLD), on optical glass substrates, covered with 300 nm thick ITO films. The structure and morphology of ZnO films were optimized for photovoltaic-cell applications by controlling the growing conditions. ZnO films (wurtzite type) were (001) preferentially oriented in the growth direction. Organic dyes were vacuum sublimated on ZnO films, and subsequently a 300 nm thick copper film was vacuum sublimated on top of the structure, acting as an ohmic contact. Action spectra of ITO/ZnO/CuPc/Cu photovoltaic structures were recorded and a well defined response was observed in the range of absorption bands of organic dyes. The dark I-V characteristics were also recorded, and electrical characterizations of the photovoltaic structures are given. The measured fourth quadrant I-V characteristics under integral illumination (photoelement regime), allowed us to extract the typical photovoltaic cells parameters..

Keywords

Zinc oxide, Copper-phthalocyanine, Photovoltaic effect.

Submitted at: Nov. 14, 2006
Accepted at: May 15, 2007

Citation

C. TAZLAOANU, L. ION, G. SOCOL, M. SOCOL, I. N. MIHAILESCU, F. STANCULESCU, I. ENCULESCU, F. IONESCU, L. MAGHERUŞAN, S. ANTOHE, Photosensitization of ZnO nanostructured thin films with organic dyes, Journal of Optoelectronics and Advanced Materials Vol. 9, Iss. 5, pp. 1342-1346 (2007)