Journal
ACS NANO
Volume 4, Issue 10, Pages 6285-6291Publisher
AMER CHEMICAL SOC
DOI: 10.1021/nn1022878
Keywords
ZnO nanowire; Schottky contact; piezopotential; photodetector; piezo-phototronic effect
Categories
Funding
- BES DOE [DE-FG02-07ER46394]
- Airforce
- NSF [DMS0706436, CMMI0403671]
- NSFC [60706020]
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We demonstrate the piezoelectric effect on the responsivity of a metal-semiconductor-metal ZnO micro-/nanowire photodetector. The responsivity of the photodetector is respectively enhanced by 530%, 190%, 9%, and 15% upon 4.1 pW, 120.0 pW, 4.1 nW, and 180.4 nW UV light illumination onto the wire by introducing a -0.36% compressive strain in the wire, which effectively tuned the Schottky barrier height at the contact by the produced local piezopotential. After a systematic study on the Schottky barrier height change with tuning of the strain and the excitation light intensity, an in-depth understanding is provided about the physical mechanism of the coupling of piezoelectric, optical, and semiconducting properties. Our results show that the piezo-phototronic effect can enhance the detection sensitivity more than 5-fold for pW levels of light detection.
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