The photon-current conversion properties of nanostructured TiO₂/poly(3-methythiophene) (PMT) film electrode were studied by using the photocurrent action spectra, the photocurrent dependence of potential and UV-Vis absorption spectra. The bandgap of PMT film is 1.93 eV. The diagram of energy level of PMT film was determined with cyclic voltamogramm and photoelectrochemical method. The conduction band of PMT film is －3.44 eV. The p-n heterojunction existed in the TiO₂/PMT film electrode, which favors the separation of electron-hole pairs. The nanostructure can enlarge the visible optical absorption region and obviously increase the photocurrent in visible region. The photocurrent threshold shifted to ＞600 nm, and the photon-electron conversion efficiency could be improved.

Key words: nanostructured TiO₂/PMT electrode, photoelectrochemistry, conducting polymer