Enhanced photoresponse of epitaxially grown ZnO by MoO3 surface functionalization
- 6 January 2020
- journal article
- research article
- Published by Royal Society of Chemistry (RSC) in Physical Chemistry Chemical Physics
- Vol. 22 (4), 2399-2404
- https://doi.org/10.1039/c9cp06667e
Abstract
ZnO has broad applications in optoelectronic devices, including ultraviolet light emitters and photodetectors. Herein we report the impact of MoO3 surface functionalization on the photoresponse of epitaxially grown ZnO. Under illumination with 350 nm UV light, the photocurrent of ZnO is found to be enhanced by 2.87 times after the deposition of 0.2 nm MoO3. As corroborated by in situ ultraviolet photoelectron spectroscopy and X-ray photoelectron spectroscopy results, the enhanced photoresponse derives from MoO3 related gap states within the band gap of ZnO and larger upward band bending at the interface, which is attributed to the strong electron transfer from ZnO to MoO3. Moreover, photoluminescence results reveal that the recombination probability of the photo-generated charge carriers in ZnO is reduced after MoO3 surface functionalization.Funding Information
- National Natural Science Foundation of China (61401136, 11504207)
- Natural Science Foundation of Zhejiang Province (LY18F010019, LY17A040009, LY19F040005)
This publication has 48 references indexed in Scilit:
- Surface Functionalization of ZnO Nanorods with C60 Derivatives Carrying Phosphonic Acid FunctionalitiesThe Journal of Physical Chemistry C, 2011
- Enhancing Sensitivity of a Single ZnO Micro-/Nanowire Photodetector by Piezo-phototronic EffectACS Nano, 2010
- Plasmonics for improved photovoltaic devicesNature Materials, 2010
- Aluminium doped ZnO films: electrical, optical and photoresponse studiesJournal of Physics D: Applied Physics, 2007
- Giant Enhancement in UV Response of ZnO Nanobelts by Polymer Surface-FunctionalizationJournal of the American Chemical Society, 2007
- A comprehensive review of ZnO materials and devicesJournal of Applied Physics, 2005
- Adsorption and desorption of oxygen probed from ZnO nanowire films by photocurrent measurementsApplied Physics Letters, 2005
- Room-Temperature Ultraviolet Nanowire NanolasersScience, 2001
- Experimental Confirmation of the Predicted Shallow Donor Hydrogen State in Zinc OxidePhysical Review Letters, 2001
- Hydrogen as a Cause of Doping in Zinc OxidePhysical Review Letters, 2000