On the surface photoconductivity of sintered titanium dioxide pellet

Surface photoconductance of sintered titanium dioxide (TiO2) pellet has bee n studied at room temperature (306 K) and above (upto 475 K). Within the te mperature range studied, the conduction in dark has been found purely extri nsic with the activation energies of 0.07 and 0.24 eV. Moderately slow grow th of photocurrent at all temperatures indicated the presence of traps. Pho tosensitivity of the sample was found to increase continuously with the ris e of sample temperature. Analysis of the photoconductive decay of the sampl e has revealed the existence of carriers with two different relaxation time s (tau(1) and tau(2)) which varied with the sample temperature in a peculia r fashion. (C) 1999 Kluwer Academic Publishers.