Photoconductivity of ultrathin zinc oxide films

Electrical and photoelectrical properties of nondoped and doped zinc oxide films coated on glass plates by the dip-coating method are investigated at room temperature in various ambient atmospheres. The dark conductivity of the nondoped films exponentially decreased with decreasing film thickness wh...

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Bibliographic Details
Published in:Japanese Journal of Applied Physics 1994-12, Vol.33 (12A), p.6611-6615
Main Authors: TAKAHASHI, Y, KANAMORI, M, KONDOH, A, MINOURA, H, OHYA, Y
Format: Article
Language:English
Subjects:
Condensed matter: electronic structure, electrical, magnetic, and optical properties
Electronic structure and electrical properties of surfaces, interfaces, thin films and low-dimensional structures
Electronic transport phenomena in thin films and low-dimensional structures
Exact sciences and technology
Photoconduction and photovoltaic effects
Photoconduction and photovoltaic effects
photodielectric effects
Physics
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Summary:Electrical and photoelectrical properties of nondoped and doped zinc oxide films coated on glass plates by the dip-coating method are investigated at room temperature in various ambient atmospheres. The dark conductivity of the nondoped films exponentially decreased with decreasing film thickness while the conductivity under illumination of 350 nm light was almost constant at 10 0 S·cm -1 irrespective of the film thickness. Consequently thinner films showed larger photoresponse than thicker films. This thickness dependence is explained by the variation of ZnO particle size with the film thickness (fine particle model) and the additional effect of the Schottky barrier generated between the film and gold electrodes.
ISSN:0021-4922
1347-4065
DOI:10.1143/JJAP.33.6611