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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 20, Iss. 6 — Mar. 12, 2012
  • pp: 5936–5941

Ultraviolet photodetector with high internal gain enhanced by TiO2/SrTiO3 heterojunction

Min Zhang, Haifeng Zhang, Kaibo Lv, Weiyou Chen, Jingran Zhou, Liang Shen, and Shengping Ruan  »View Author Affiliations


Optics Express, Vol. 20, Issue 6, pp. 5936-5941 (2012)
http://dx.doi.org/10.1364/OE.20.005936


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Abstract

In this letter, TiO2 nanocrystalline film was prepared on SrTiO3 (001) substrate to form an n-n heterojunction active layer. Interdigitated Au electrodes were deposited on the top of TiO2 film to fabricate modified HMSM (heterojunction metal-semiconductor-metal) ultraviolet photodetector. At 10 V bias, the dark current of the detector was only 0.2 nA and the responsivity was 46.1 A/W at 260 nm. The rise and fall times of the device were 3.5 ms and 1.4 s, respectively. The TiO2/SrTiO3 heterojunction contributed a lot to the high responsivity and reduced the fall time, which improved the device performance effectively. These results demonstrate the excellent application of TiO2/SrTiO3 heterojunction in fabricating high performance UV photodetectors.

© 2012 OSA

OCIS Codes
(040.5160) Detectors : Photodetectors
(250.0250) Optoelectronics : Optoelectronics

ToC Category:
Detectors

History
Original Manuscript: December 9, 2011
Revised Manuscript: February 9, 2012
Manuscript Accepted: February 14, 2012
Published: February 27, 2012

Citation
Min Zhang, Haifeng Zhang, Kaibo Lv, Weiyou Chen, Jingran Zhou, Liang Shen, and Shengping Ruan, "Ultraviolet photodetector with high internal gain enhanced by TiO2/SrTiO3 heterojunction," Opt. Express 20, 5936-5941 (2012)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-20-6-5936


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