| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 1493909 | Optical Materials | 2015 | 4 Pages |
•TiO2 nanopores/nanotubes were grown on silicon by anodization in glycerol electrolytes containing NH4F.•For the UV irradiation, the rise and decay curves of photocurrent are fitted to a bi-exponential function.•In both cases, the photocurrent were dominated by an initial fast response about 2 s.•The ohmic I–V characteristic of the nanopores under illumination could be ascribed to the decrease of the Schottky barrier height, to the accumulation of conduction electrons, resulted from the neutralization between photogenerated holes and negatively charged oxygen ions.
We investigated the UV photoconductivity and transient response of TiO2 nanopores on silicon substrate. Ti thin films were first deposited by radio-frequency (RF) magnetron sputtering and then anodized in glycerol electrolytes containing ammonium fluoride (NH4F). For the UV irradiation, the rise and decay curves of photocurrent are well fitted to a bi-exponential function. In both cases, the photocurrent was dominated by an initial fast response about 2 s. The ohmic I–V characteristic of the TiO2 nanopores under illumination could be ascribed to the decrease of the Schottky barrier height, to the accumulation of conduction electrons, resulted from the neutralization between photogenerated holes and negatively charged oxygen ions. These nanopores arrays could be useful in serving as photodetectors, chemical and biological sensors, and switching devices for nanoscale optoelectronics.
