Experimental study demonstrates enhanced photoresponse in gold-titanium dioxide thin films via PEI surface capping, indicating barrier reduction through interface dipoles.
The photoresponse of a TiO2 thin film was significantly improved due to the decrease in the Schottky barrier height between Au and TiO2 via the formation of interface dipoles, which was caused by electrostatically self-assembled PEI on the surface of the TiO2 film.
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Gu et al. (2013) studied this question.
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