Rutile TiO₂ nanowire arrays interconnected with ZnO nanosheets for high performance electrochemical UV sensors

Abstract

Hierarchical nanostructures consisting of TiO2 nanowire arrays and ZnO nanosheets were prepared and investigated as active materials in photoelectrochemical UV sensors.

Recent Progress of Heterojunction Ultraviolet Photodetectors: Materials, Integrations, and Applications

“…For instance, the TiO 2 /SnO 2 branched heterojunction that works as a PEC type photodetector presents a self‐powered property with high responsivity of 0.6 A W −1 under UV illumination 170. The heterostructure of TiO 2 /ZnO also suppresses charge recombination due to well‐designed type‐II energy band alignment 171. These works provide an instructive strategy to build PEC type heterojunction UV photodetectors.…”

Expansion of the response range of photoelectrochemical UV detector using an ITO/Ag-nanowire/quartz UV-visible transparent conductive electrode

“…We have analyzed this in detail in our previous work. 40 Fig. 7(b) shows the expanded rising and decay edge of the photocurrent density.…”

Polymer Thin-Film Dewetting-Mediated Growth of Wettability-Controlled Titania Nanorod Arrays for Highly Responsive, Water-Stable Self-powered UV Photodetectors

“…The superior I−V characteristics under 375 nm illuminations manifest the UV photoresponsive behavior of the devices. Dark I−V characteristics of all the devices show a negative open-circuit voltage and nonzero positive current under zero bias, attributed to the existence of surface states or defects such as oxygen vacancies acting as shallow charge-trapping centers, which are unable to thermally escape at room temperature 64,65. It is observed that PS 25 and PS 40 devices exhibit significantly low dark currents in comparison to the control device.…”