Direct observation of microscopic photoinduced charge redistribution on TiO2 film sensitized by chloroaluminum phthalocyanine and perylenediimide
- 1 September 2003
- journal article
- Published by AIP Publishing in Applied Physics Letters
- Vol. 83 (9) , 1896-1898
- https://doi.org/10.1063/1.1608490
Abstract
The microscopic photoinduced charge redistribution on the surface of an organic dye composite layer was directly observed using Kelvin probe force microscopy (KFM) coupled with a laser source. The organic layer composed of chloroaluminum phthalocyanine and N,N ′ -dioctadecyl-3,4,9,10-perylene tetracarboxylic-diimide was cast onto the surface of nano- TiO 2 film. Under illumination, the surface potential morphologies of the organic layer changed from large fluctuation to relatively uniform features. Such a phenomenon was associated with the photoinduced charge transfer between the dye composite and nano- TiO 2 , which was rationalized in terms of energy level alignment. Considering that the KFM have been proved to be a visual technique in the characterization of nanomaterials, we have presented a method to visualize the photoinduced charge transfer in microscopic scale.Keywords
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