Enhanced photoresponses of polypyrrole on surface modified TiO2 with self-assembled monolayers

Photodevices comprising covalently grafted polypyrrole films on surface modified mesoporous TiO2 substrates via 3-(trimethoxysilyl) propyl methacrylate were fabricated and tested their performances with a counter electrode having a thin layer of gold. Significant photoresponses were observed with the addition of an ionic liquid, 1-ethyl-3-methylimidazolium bis-trifluoromethylsulfonyl amide containing 0.2 M LiTf2N and painting a layer of graphite on the surface of PPY The cell TiO2/PPY-C/Au cell delivered a short circuit current of similar to 600 mu A cm(-2) with an open circuit voltage of similar to 500 mV under the irradiation of 100 mW cm(-2) (AM 1.5). The average corresponding fill factors and the efficiencies were 0.51 and similar to 0.2%, respectively. (c) 2006 Elsevier B.V. All rights reserved.