An ultrafast response grating structural ZnO photodetector with back-to-back Schottky barriers produced by hydrothermal growth

Cheolmin Park; Jihye Lee; Hye-Mi So; Won Seok Chang

doi:10.1039/C4TC02821J

An ultrafast response grating structural ZnO photodetector with back-to-back Schottky barriers produced by hydrothermal growth

Cheolmin Park,^a^b Jihye Lee,^a^b Hye-Mi So^b and Won Seok Chang*^a^b

Author affiliations

* Corresponding authors

^a Nano-mechatronics Department, Korea University of Science and Technology (UST), 217 Gajeong-ro Yuseong-gu, Daejeon, Korea

^b Nano-convergence Mechanical System Research Division, Korea Institute of Machinery and Materials (KIMM), 156 Gajungbukno, Yuseong-gu, Daejeon, Korea
E-mail: paul@kimm.re.kr

Abstract

An ultrafast response metal–semiconductor–metal type ZnO ultraviolet photodetector was fabricated by ultraviolet nanoimprint lithography (UV-NIL) with hydrothermal synthesis. The extremely fast response time was due to the Schottky barrier formation attributed to the control of the hydrothermal growth time and grating structure of ZnO, produced by a position-controlled pattering method of UV-NIL. With an on/off frequency of ultraviolet light of 2 kHz using an optical chopper, the device exhibits a rising time of 43 μs and a falling time of 54 μs at a low bias voltage (0.5 V) with a responsivity of 22.1 A W⁻¹ in the active area of 5 × 5 μm². In comparison to other fast response ZnO photodetectors, our device definitely uses easy and low-cost fabrication methods as well as exhibits high performance.

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Publication details

The article was received on 08 Dec 2014, accepted on 25 Jan 2015 and first published on 27 Jan 2015

Article type: Communication

DOI: 10.1039/C4TC02821J

Author version available: Download Author version (PDF)

Citation: J. Mater. Chem. C, 2015,3, 2737-2743

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An ultrafast response grating structural ZnO photodetector with back-to-back Schottky barriers produced by hydrothermal growth

C. Park, J. Lee, H. So and W. S. Chang, J. Mater. Chem. C, 2015, 3, 2737
DOI: 10.1039/C4TC02821J
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Journal of Materials Chemistry C

An ultrafast response grating structural ZnO photodetector with back-to-back Schottky barriers produced by hydrothermal growth

Abstract

Supplementary files

Publication details

An ultrafast response grating structural ZnO photodetector with back-to-back Schottky barriers produced by hydrothermal growth

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