Title :
Novel Ga-ZnO Nanosheet Structures Applied in Ultraviolet Photodetectors
Author :
Chih-Chiang Yang ; Yan-Kuin Su ; Chih-Hung Hsiao ; Sheng-Joue Young ; Tsung-Hsien Kao ; Ming-Yueh Chuang ; Yu-Chun Huang ; Bo-Chin Wang ; San-Lein Wu
Author_Institution :
Dept. of Electr. Eng., Nat. Cheng Kung Univ., Tainan, Taiwan
Abstract :
Vertically aligned Ga-doped ZnO (GZO) nanosheets were grown on a glass substrate using a low-temperature (90 °C) hydrothermal method. The average length and diameter of the nanosheets were ~720 and 26 nm, respectively. The GZO nanosheets exhibited wurtzite and monoclinic structures. A metal-semiconductor-metal ultraviolet (UV) photodetector (PD) was also fabricated for the GZO nanosheets. Results revealed that the photoresponses of the GZO UV PD were flat at short wavelengths. Meanwhile, a sharp cutoff was observed at 340 nm. The UV-to-visible rejection ratio of the fabricated PD was ~89 at 1 V bias voltage.
Keywords :
gallium; heat treatment; metal-semiconductor-metal structures; nanophotonics; nanostructured materials; optical fabrication; optical glass; photodetectors; ultraviolet spectra; visible spectra; zinc compounds; GZO UV PD; GZO nanosheet; UV-to-visible rejection ratio; ZnO:Ga; bias voltage; glass substrate; low-temperature hydrothermal method; metal-semiconductor-metal ultraviolet photodetector; monoclinic structures; nanosheet average length; nanosheet diameter; photoresponses; sharp cutoff; size 26 nm; temperature 90 degC; vertically aligned Ga-doped ZnO nanosheet structures; voltage 1 V; wavelength 340 nm; wurtzite structures; Educational institutions; Glass; Nanobioscience; Optical device fabrication; Photodetectors; Substrates; Zinc oxide; GZO; hydrothermal; nanosheet; photodetector;
Journal_Title :
Photonics Technology Letters, IEEE
DOI :
10.1109/LPT.2014.2322512
