Journal
ACS NANO
Volume 6, Issue 10, Pages 9229-9236Publisher
AMER CHEMICAL SOC
DOI: 10.1021/nn3035765
Keywords
ZnO-CdS core-shell micro/nanowire; Schottky contact; piezopotential; photodetector; piezo-phototronic effect
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Funding
- Airforce, MURI, U.S. Department of Energy, Office of Basic Energy Sciences [DE-FG02-07ER46394]
- NSF [CMMI 0403671]
- Knowledge Innovation Program of the Chinese Academy of Sciences [KJCX2-YW-M13]
- National Nature Science Foundation of China [21275018]
- 111 Project in China [807012]
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The piezo-phototronic effect is about the use of the piezoelectric potential created inside some materials for enhancing the charge carrier generation or separation at the metal-semiconductor contact or pn junction. In this paper, we demonstrate the impact of the piezo-phototronic effect on the photon sensitivity for a ZnO-CdS core-shell micro/nanowire based visible and UV sensor. CdS nanowire arrays were grown on the surface of a ZnO micro/nanowire to form a ZnO-CdS core-shell nanostructure by a facile hydrothermal method. With the two ends of a ZnO-CdS wire bonded on a polymer substrate, a flexible photodetector was fabricated, which is sensitive simultaneously to both green light (548 nm) and UV light (372 nm). Furthermore, the performance of the photon sensor is much enhanced by the strain-induced piezopotential in the ZnO core through modulation of the Schottky barrier heights at the source and drain contacts. This work demonstrates a new application of the piezotronic effect in photon detectors.
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