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Optics Express

Optics Express

  • Editor: Andrew M. Weiner
  • Vol. 22, Iss. 1 — Jan. 13, 2014
  • pp: 908–915

Dual detection of ultraviolet and visible lights using a DNA-CTMA/GaN photodiode with electrically different polarity

M. Siva Pratap Reddy, Bong-Joong Kim, and Ja-Soon Jang  »View Author Affiliations

Optics Express, Vol. 22, Issue 1, pp. 908-915 (2014)

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We demonstrated the dual-detectable DNA-CTMA/n-GaN photodiode (DG-PD) for ultraviolet and visible lights. Halogen and UV lamps are employed to recognize the visible and UV wavelength, respectively. The DG-PD under dark condition has a negative-bias shift of current-voltage (I-V) curves by 0.78 V compared to reference diode without DNA. However, the I-V curves move towards positive bias side by 0.75 V and 1.02 V for the halogen- and UV-exposed photodiode, respectively. These cause electrically different polarity and amount for halogen- and UV-induced photocurrents, indicating that the DNA-CTMA on n-GaN is quite effective for recognizing visible and UV lights as a dual-detectable photodiode. The formation and charge transport mechanisms are also discussed.

© 2014 Optical Society of America

OCIS Codes
(230.5160) Optical devices : Photodetectors
(250.0250) Optoelectronics : Optoelectronics
(250.2080) Optoelectronics : Polymer active devices

ToC Category:

Original Manuscript: November 6, 2013
Revised Manuscript: December 5, 2013
Manuscript Accepted: December 31, 2013
Published: January 8, 2014

M. Siva Pratap Reddy, Bong-Joong Kim, and Ja-Soon Jang, "Dual detection of ultraviolet and visible lights using a DNA-CTMA/GaN photodiode with electrically different polarity," Opt. Express 22, 908-915 (2014)

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