화학공학소재연구정보센터
Current Applied Physics, Vol.10, No.4, 1117-1122, 2010
Persistence in photoconductivity and optical property of nanostructured copper (II) phthalocyanine thin films
The optical and photoconductive properties of nanostructured copper (II) phthalocyanine (CuPc) surface cells have been studied at room temperature (30 degrees C). The change in the conductivity of the surface type sample cells under illumination of light was studied as a function of duration and wavelength of photo-excitation. The photoconductivity spectrum of a film of CuPc surface cell does not agree with the absorption spectrum. Particularly for the photoexciting wavelengths in the region 400-500 nm, the photoconductivity shows an appreciable value (or comparatively higher value), although the absorbance in this region is minimum or very less. The change in current under illumination of light and after turning it off has indicated that photoinduced effects persist for a longer period of time even after turning off the illumination of light of various wavelengths and duration. An increase in persistence in photocurrent was noticed with the repeated exposure within a short interval of time. Such studies are important for searching new types of electrically conducting systems (semiconductors) in the form of nanostructured thin films for use as photoactive materials in optoelectronic and memory devices. (C) 2010 Elsevier B.V. All rights reserved.