Journal of Materials Science, Vol.34, No.16, 3997-4000, 1999
On the surface photoconductivity of sintered titanium dioxide pellet
Surface photoconductance of sintered titanium dioxide (TiO2) pellet has been studied at room temperature (306 K) and above (upto 475 K). Within the temperature range studied, the conduction in dark has been found purely extrinsic with the activation energies of 0.07 and 0.24 eV. Moderately slow growth of photocurrent at all temperatures indicated the presence of traps. Photosensitivity of the sample was found to increase continuously with the rise of sample temperature. Analysis of the photoconductive decay of the sample has revealed the existence of carriers with two different relaxation times (tau(1) and tau(2)) which varied with the sample temperature in a peculiar fashion.