An ultraviolet photo-detector based on TiO2/water solid-liquid heterojunction

In this study, an ultraviolet photodetector (UV-PD) based on TiO2/water solid-liquid heterojunction (SLHJ) is reported. The SLHJ UV-PD exhibits a high photosensitivity, excellent spectral selectivity, linear variations in photocurrent, and fast response. In addition, it is suggested that the spectral response can be tailored and that the performance can be improved through deliberate design of the active layer, electrolyte, and substrate of the SLHJ UV-PD. Moreover, we anticipate this work to be a starting point for more sophisticated commercial photon detection using an SLHJ device. (C) 2011 American Institute of Physics. [doi: 10.1063/1.3671076]