A hybrid layer system consisting of anatase, an N-substituted dithienylated phenothiazine (DTPT) with a carboxylic anchor group asmolecular donor-pi-acceptor-system and poly(3-hexylthiophene) as hole transporting material is studied by means of X-ray and UV-photoelectron spectroscopy and UV/vis spectroscopy. The optoelectronic properties of the DTPT and the energy level alignment at the interface DTPT/TiO2 enable the design of an UV-responsive hybrid solar cell, which is conceptually presented. (C) 2015 Elsevier B.V. All rights reserved.