Monolayer Graphene Film on ZnO Nanorod Array for High‐Performance Schottky Junction Ultraviolet Photodetectors
Top Cited Papers
- 13 March 2013
- Vol. 9 (17), 2872-2879
- https://doi.org/10.1002/smll.201203188
Abstract
A new Schottky junction ultraviolet photodetector (UVPD) is fabricated by coating a free‐standing ZnO nanorod (ZnONR) array with a layer of transparent monolayer graphene (MLG) film. The single‐crystalline [0001]‐oriented ZnONR array has a length of about 8–11 μm, and a diameter of 100∼600 nm. Finite element method (FEM) simulation results show that this novel nanostructure array/MLG heterojunction can trap UV photons effectively within the ZnONRs. By studying the I–V characteristics in the temperature range of 80–300 K, the barrier heights of the MLG film/ZnONR array Schottky barrier are estimated at different temperatures. Interestingly, the heterojunction diode with typical rectifying characteristics exhibits a high sensitivity to UV light illumination and a quick response of millisecond rise time/fall times with excellent reproducibility, whereas it is weakly sensitive to visible light irradiation. It is also observed that this UV photodetector (PD) is capable of monitoring a fast switching light with a frequency as high as 2250 Hz. The generality of the above results suggest that this MLG film/ZnONR array Schottky junction UVPD will have potential application in future optoelectronic devices.Keywords
This publication has 37 references indexed in Scilit:
- ZnO nanorod/GaN light-emitting diodes: The origin of yellow and violet emission bands under reverse and forward biasJournal of Applied Physics, 2011
- A ZnO-Nanowire Phototransistor Prepared on Glass SubstratesACS Applied Materials & Interfaces, 2011
- ZnO nanowires array p-n homojunction and its application as a visible-blind ultraviolet photodetectorApplied Physics Letters, 2010
- ZnO nanowire arrays: Optical scattering and sensitization to solar lightApplied Physics Letters, 2008
- Photosensitization of ZnO Nanowires with CdSe Quantum Dots for Photovoltaic DevicesNano Letters, 2007
- ZnO Nanowire UV Photodetectors with High Internal GainNano Letters, 2007
- Simple fabrication of a ZnO nanowire photodetector with a fast photoresponse timeApplied Physics Letters, 2006
- ZnO nanowire field-effect transistor and oxygen sensing propertyApplied Physics Letters, 2004
- Piezoelectric Characterization of Individual Zinc Oxide Nanobelt Probed by Piezoresponse Force MicroscopeNano Letters, 2004
- Room-Temperature Ultraviolet Nanowire NanolasersScience, 2001