Recombination in nanophase TiO₂ films

Abstract

Recombination and transport parameters were determined in Schottky diodes made of thin TiO₂ solgel films with particle size around 50 nm. Effective recombination times are typically in the range, 10 μs<τ<1 ms, depending on injection level. The lifetimes are found to decrease at higher current levels, indicating bimolecular recombination kinetics due to a progressive increase in trap occupation. The mobility-lifetime product is estimated to be ≈5×10⁻¹¹ cm²/V and is independent of current level.