High quality ZnO-TiO 2 core-shell nanowires for efficient ultraviolet sensing

Dali Shao, Hongtao Sun, Guoqing Xin, Jie Lian, Shayla Sawyer

Research output: Contribution to journalArticlepeer-review

38 Scopus citations

Abstract

High quality ZnO-TiO 2 core-shell nanowires (NWs) have been fabricated via a facile two-step method: growth of ZnO nanowires by hydrothermal synthesis and then coating of highly uniform TiO 2 shell using atomic layer deposition (ALD) technique. The ultraviolet (UV) emission intensity of the ZnO-TiO 2 core-shell NWs is largely quenched due to an efficient electron-hole separation that reduces the band-to-band recombinations. To the contrary, the absorption of the ZnO-TiO 2 core-shell NWs in both UV and visible region is enhanced, which is attributed to the antireflection properties of the TiO 2 shell. An UV photodetector fabricated from the ZnO-TiO 2 core-shell NWs showed a maximum photoresponsivity as high as 495 A/W at 373 nm under -10 V, which is ∼8 times higher than that of the photodetector fabricated from bare ZnO NWs. In addition, the transient response of the ZnO-TiO 2 core-shell NWs is improved by 6 times as compared to that of the bare ZnO NWs. The results presented in this work suggest that ZnO-TiO 2 core-shell NWs may be promising for various optoelectronics applications including: UV photodetectors, optical switches, optical fibers and solar cells.

Original languageEnglish (US)
Pages (from-to)872-876
Number of pages5
JournalApplied Surface Science
Volume314
DOIs
StatePublished - Sep 30 2014
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Condensed Matter Physics
  • Physics and Astronomy(all)
  • Surfaces and Interfaces
  • Surfaces, Coatings and Films

Keywords

  • Heterojunction
  • Photoresponsivity
  • UV photodetector

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