Au/TiO2 nanorod-based Schottky-type UV photodetectors

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Karaagac H., Aygun L. E., PARLAK M., Ghaffari M., Biyikli N., Okyay A. K.

PHYSICA STATUS SOLIDI-RAPID RESEARCH LETTERS, vol.6, no.11, pp.442-444, 2012 (SCI-Expanded) identifier identifier

  • Publication Type: Article / Article
  • Volume: 6 Issue: 11
  • Publication Date: 2012
  • Doi Number: 10.1002/pssr.201206379
  • Journal Name: PHYSICA STATUS SOLIDI-RAPID RESEARCH LETTERS
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Page Numbers: pp.442-444
  • Keywords: nanorods, photodetectors, responsivity, Schottky diodes, TiO2, hydrothermal growth
  • Middle East Technical University Affiliated: Yes

Abstract

TiO2 nanorods (NRs) were synthesized on fluorine-doped tin oxide (FTO) pre-coated glass substrates using hydrothermal growth technique. Scanning electron microscopy studies have revealed the formation of vertically-aligned TiO2 NRs with length of similar to 2 mu m and diameter of 110128 nm, homogenously distributed over the substrate surface. 130 nm thick Au contacts using thermal evaporation were deposited on the n-type TiO2 NRs at room temperature for the fabrication of NR-based Schottky-type UV photodetectors. The fabricated Schottky devices functioned as highly sensitive UV photodetectors with a peak responsivity of 134.8 A/W (lambda = 350 nm) measured under 3 V reverse bias. (c) 2012 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim