Fabrication and characterization of indium-tin-oxide/GaN visible-blind UV detectors

H. F. Lui, W. K. Fong, C. Surya, C. H. Cheung, A. B. Djurišić

Research output: Contribution to journalConference articlepeer-review

3 Citations (Scopus)

Abstract

We report the fabrication and characterization of visible-blind GaN-based UV photodetectors with indium-tin-oxide (ITO)/GaN Schottky junctions. We have systematically studied the optimal growth conditions for the ITO layers. Responsivity of 0.041 A/W was obtained for the optimised ITO/GaN UV detectors at 350nm. The I-V characteristics show that the reverse leakage currents of the devices are strongly dependent on the deposition conditions of the ITO. The experimental results indicate that interfacial traps play an important role on the optoelectronic properties of the devices. To improve the ITO/GaN interface, a thin Ni layer was deposited between the ITO and the GaN. Our results show that this leads to significant improvements in the leakage current, low-frequency excess noise and the UV-to-visible rejection ratio.

Original languageEnglish
Pages (from-to)2295-2298
Number of pages4
JournalPhysica Status Solidi (C) Current Topics in Solid State Physics
Volume3
DOIs
Publication statusPublished - Jul 31 2006
Externally publishedYes
Event6th International Conference on Nitride Semiconductors, ICNS-6 - Bremen, Germany
Duration: Aug 28 2005Sep 2 2005

ASJC Scopus subject areas

  • Condensed Matter Physics

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