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Applied Optics

Applied Optics


  • Editor: Joseph N. Mait
  • Vol. 49, Iss. 29 — Oct. 10, 2010
  • pp: 5678–5681

Low-noise solar-blind photodetectors based on LaAlO 3 single crystal with transparent indium-tin-oxide electrode as detection window

Er-Jia Guo, Hui-Bin Lu, Meng He, Kui-Juan Jin, and Guo-Zhen Yang  »View Author Affiliations

Applied Optics, Vol. 49, Issue 29, pp. 5678-5681 (2010)

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The low-noise solar-blind photodetectors of indium-tin-oxide/ LaAlO 3 / Ag (ITO/LAO/Ag) have been fabricated based on the properties of LAO bandgap excitation and the transparent conductance of ITO thin film. The ITO thin films are epitaxially grown on LAO wafers as the electrodes and detection windows of the photodetectors. The photodetectors have low noise and excellent electromagnetic shielding. The influence of the thickness of ITO thin films on the responsivity of the photodetectors has been studied. The photocurrent responsivity can reach 10.3 mA / W under the irradiation of 200 220 nm for a photodetector with 5 nm thick ITO film. The noise current is 1 pA order magnitude under the sunlight at midday. The experiment results suggest that ITO/LAO/Ag is one of the promising structures for the solar-blind deep-ultraviolet photodetectors.

© 2010 Optical Society of America

OCIS Codes
(040.5150) Detectors : Photoconductivity
(040.5160) Detectors : Photodetectors
(040.7190) Detectors : Ultraviolet
(310.7005) Thin films : Transparent conductive coatings

ToC Category:

Original Manuscript: July 1, 2010
Revised Manuscript: September 10, 2010
Manuscript Accepted: September 13, 2010
Published: October 8, 2010

Er-Jia Guo, Hui-Bin Lu, Meng He, Kui-Juan Jin, and Guo-Zhen Yang, "Low-noise solar-blind photodetectors based on LaAlO3single crystal with transparent indium-tin-oxide electrode as detection window," Appl. Opt. 49, 5678-5681 (2010)

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