Hydrothermal Growth of Quasi-Monocrystal ZnO Thin Films and Their Application in Ultraviolet Photodetectors

Yung Chun Tu, Shui Jinn Wang, Tseng Hsing Lin, Chien Hsiung Hung, Tsung Che Tsai, Ru Wen Wu, Kai Ming Uang, Tron Min Chen

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4 Citations (Scopus)

Abstract

Quasi-monocrystal ZnO film grown using the hydrothermal growth method is used for the fabrication of Cu/ZnO heterojunction (HJ) ultraviolet photodetectors (UV-PDs). The HJ was formed via the sputtering deposition of p-type Cu onto hydrothermally grown ZnO film (HTG-ZnO-film). The effect of annealing temperature in the nitrogen ambient on the photoluminescence spectra of the synthesized ZnO film was studied. The optoelectronic properties of Cu/ZnO film with various Cu thicknesses (250-750 nm) under UV light (365 nm; intensity: 3 mW/cm2) were determined. The UV sensitivity of the HTG-ZnO-film-based UV-PDs and the sputtered ZnO-film-based UV-PDs were 55.6-fold (SHTG) and 8.8-fold (Ssputter), respectively. The significant gain in sensitivity (SHTG/Ssputter = 630%) of the proposed ZnO-film-based device compared to that for the device based on sputtered film can be attributed to the improved photoelectric properties of quasi-monocrystal ZnO film.

Original languageEnglish
Article number261372
JournalInternational Journal of Photoenergy
Volume2015
DOIs
Publication statusPublished - 2015

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Atomic and Molecular Physics, and Optics
  • Renewable Energy, Sustainability and the Environment
  • Materials Science(all)

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