Deep-ultraviolet Al0.75Ga0.25N photodiodes with low cutoff wavelength

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Butun S., Tut T., Butun B., Gokkavas M., Yu H., Ozbay E.

APPLIED PHYSICS LETTERS, vol.88, no.12, 2006 (SCI-Expanded) identifier identifier

  • Publication Type: Article / Article
  • Volume: 88 Issue: 12
  • Publication Date: 2006
  • Doi Number: 10.1063/1.2186974
  • Journal Name: APPLIED PHYSICS LETTERS
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Abdullah Gül University Affiliated: Yes

Abstract

Deep ultraviolet Al0.75Ga0.25N metal-semiconductor-metal photodetectors with high Al concentration have been demonstrated. A metal-organic chemical vapor deposition grown high quality Al0.75Ga0.25N layer was used as a template. Spectral responsivity, current-voltage, optical transmission, and noise measurements were carried out. The photodetectors exhibited a 229 nm cutoff wavelength and a peak responsivity of 0.53 A/W at 222 nm. Some 100x100 mu m(2) devices have shown a dark current density of 5.79x10(-10) A/cm(2) under 50 V bias. An ultraviolet-visible rejection ratio of seven orders of magnitude was obtained from the fabricated devices.