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Proceedings Paper

Photoconductivity on nanostructured sol-gel thin films with silver nanoparticles
Author(s): Jorge Garcia-Macedo; Alfredo Franco; Guadalupe Valverde; Jeffrey I. Zink
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Paper Abstract

2d-hexagonal nanostructured sol-gel thin films were prepared by dip-coating method. A neutral surfactant Brij58 was used as template to produced channels into the film. The structure was identified by X-ray diffraction and TEM. Silver nanoparticles were obtained by spontaneous reduction process of Ag+ ions to Ag0 at room temperature. A broad band located at 430 nm was detected by optical absorption; it corresponds to the surface plasmon. Photoconductivity studies were performed on films with ions and with silver nanoparticles to characterize their mechanisms of charge transport in the darkness and under illumination at 420 and 633 nm wavelengths. Straight lines showing an ohmic behavior fit the experimental data. Films without colloids possess normal photoconductivity behavior. But films with colloids present an abnormal response. Transport parameters were calculated. The films with silver nanoparticles exhibit a photovoltaic effect stronger than the films without nanoparticles, except to high concentrations. A theoretical model is proposed to predict these processes as function of the silver concentration.

Paper Details

Date Published: 3 November 2004
PDF: 10 pages
Proc. SPIE 5520, Organic Photovoltaics V, (3 November 2004); doi: 10.1117/12.559688
Show Author Affiliations
Jorge Garcia-Macedo, Univ. Nacional Autonoma de Mexico (Mexico)
Alfredo Franco, Univ. Nacional Autonoma de Mexico (Mexico)
Guadalupe Valverde, Univ. Nacional Autonoma de Mexico (Mexico)
Jeffrey I. Zink, Univ. of California/Los Angeles (United States)

Published in SPIE Proceedings Vol. 5520:
Organic Photovoltaics V
Zakya H. Kafafi; Paul A. Lane, Editor(s)

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