Enhanced Ultraviolet Emission from Hydrothermally Grown ZnO Nano-Grass on Si Substrate

C. Yan, C.M. Raghavan, C. Ji, R. Sun, C.-P. Wong

Research output: Contribution to journalArticlepeer-review


Highly crystalline one-dimensional zinc oxide (ZnO) nano-grass was grown on silicon (Si) substrate by a modified hydrothermal method. A predominantly c-oriented ZnO nano-grass with an average diameter of 40–60 nm and length of 1.5–2.0 μm was obtained. From the photoluminescence (PL) measurement, we observed a defect-free, intense ultraviolet emission of as-grown ZnO nano-grass, confirming the absence of singly ionized oxygen vacancies. The absence of green deep-level emission in the PL spectrum further implies a high crystallinity of as-grown ZnO nano-grass. The high-quality ZnO nano-grass has potential applications in single nanowire-based light-emitting diodes, solar cells, themoresistive sensing, photocatalysis, ultraviolet photodetectors, optical switches, waveguides and nano-lasers.

Original languageEnglish
Pages (from-to)1540-1544
Number of pages5
JournalJournal of Electronic Materials
Issue number3
Early online date7 Jan 2019
Publication statusPublished - 1 Mar 2019


  • ZnO nanowires
  • annealing process
  • hydrothermal method
  • photoluminescence
  • ultraviolet emission


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