ZnO nanorods array as light absorption antenna for high-gain UV photodetectors

Haorong Zheng, Yurong Jiang, Shengyi Yang*, Yong Zhang, Xuefeng Yan, Jinming Hu, Yuansheng Shi, Bingsuo Zou

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

49 Citations (Scopus)

Abstract

Hydrothermal method provides the advantages of simple, low-temperature growth conditions, low cost and large surface areas for the samples. Also, exciton dissociation can be enhanced by surface plasmon resonance (SPR) due to the plasmonic absorption enhancement of incident light. In this paper, high-gain ultraviolet (UV) photodetectors based on vertically aligned ZnO nanorods (ZnO-NRs) array as light absorption antenna were presented, in which ZnO-NRs array was prepared by hydrothermal method. Our experimental data showed that the device performance of the UV photodetector Au/ZnO(ZnO-NRs:Au-NPs)/Au can be further enhanced after the gaps of ZnO-NRs array were filled with Au nanoparticles (Au-NPs). The photo-to-dark current ratio and the specific detectivity of the UV photodetector Au/ZnO(ZnO-NRs:Au-NPs)/Au reached to 1 × 105 and 1.84 × 1013 Jones at 2 V under 100 μW/cm2 365 nm illumination, respectively. The physical mechanism for the enhanced performance of the UV photodetectors is discussed.

Original languageEnglish
Article number152158
JournalJournal of Alloys and Compounds
Volume812
DOIs
Publication statusPublished - 5 Jan 2020

Keywords

  • Hydrothermal method
  • Schottky contact
  • Surface plasmon resonance (SPR)
  • Ultraviolet (UV) photodetectors
  • ZnO nanorods (ZnO-NRs) array

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