STUDY ON THE PHOTOINDUCED INTERFACIAL CHARGE-TRANSFER IN TIO2 FE2O3 HETEROSTRUCTURED COMPOSITE FILM/

Heterostructured TiO2/Fe2O3 composite film was obtained by spin-coatin g alpha-Fe2O3 hydrosol on the TiO2 nanoparticulate film prepared by th e soi-gel method. The composite film was characterized by surface phot ovoltaic spectroscopy (SPS) and electric-field-induced surface photovo ltaic spectroscopy (EFSPS), and the results showed that the composite film had the extended photovoltaic response which can be modified by t he external electric field. Based on these results, a photoinduced int erfacial charge transfer mechanism was deduced and the energy band str ucture of the composite film was concluded. (C) 1998 Elsevier Science S.A, All rights reserved.