Tunable TiO2 films for high-performing transparent Schottky photodetector

We demonstrate the transparent Schottky photodetector of the configuration Cu/TiO2/FTO unveiling superior photodetection properties. The improved performance of fabricated photodetector was ascribed to high quality rutile-nanocrystalline TiO2 films with very high absorption coefficient (~6×105 cm−1) and excitonic localized states. The existence of such localized states in TiO2 Schottky device offered fastest response time of 1.12 ms suggesting their application in fast switching photodetectors. In addition, the photodetectors showed high responsivity of the value 0.897 A/W and detectivity 4.5×1012 Jones. This transparent TiO2 design would provide a functional route for various photoelectric device applications.