| Monolayer Graphene Film on ZnO Nanorods Array for High-Performance Schottky Junction Ultraviolet Photodetectors |
Biao Nie, Ji-Gang Hu, Lin-Bao Luo*, Chao Xie, Long-Hui Zeng, Peng Lv, Fang-Ze Li, Jian-Sheng Jie, Mei Feng, Chun-Yan Wu, Yong-Qiang Yu, Shu-Hong Yu*
Abstract:In this Article, we report on a new Schottky junction ultraviolet photodetector (UVPD) fabricated by coating free standing ZnO nanorods (ZnONRs) array with a layer of transparent monolayer graphene (MLG) film. The single-crystalline [0001] oriented ZnONRs array has a length of about 8~11 µm, and a diameters of 100~600 nm, respectively. Finite element method (FEM) simulation result shows that this novel nanostructures array/MLG hetero-junction 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 at different temperatures were estimated. Interestingly, the hetero-junction diode with typical rectifying characteristics exhibits high sensitivity to UV light illumination and quick response speed of ms rise time/fall time with excellent reproducibility, whereas it is weakly sensitive to visible light irradiation. It is also observed that this UVPD 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/ZnONRs array Schottky junctions UVPD will have potential applications in future optoelectronic devices. |
| Small. |
|
