Grain size and thickness effect on the performance of sol-gel based TiO2 Schottky diodes

► Sol-gel based TiO2 Schottky diodes are made. ► TiO2 sol-gel is made with TIP as a precursor, ethanol as a solvent and HCl as a catalyst. ► The forward current of the Schottky diodes increases as the TiO2 film thickness increases. ► The enhancement of the forward current is mainly due to the grain size effect.