High-performance photodetectors for visible and near-infrared lights based on individual WS2 nanotubes

We propose that a photodetector based on nanotubes formed from layered structure may have a faster response than nanowires or nanobelts. The layered compound tungsten disulfide (WS2) can absorb visible and near-infrared lights. We fabricated photodetectors based on individual WS2 nanotubes. The phot...

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Veröffentlicht in:Applied physics letters 2012-06, Vol.100 (24)
Hauptverfasser: Zhang, Chaoying, Wang, Sheng, Yang, Leijing, Liu, Yang, Xu, Tingting, Ning, Zhiyuan, Zak, Alla, Zhang, Zhiyong, Tenne, Reshef, Chen, Qing
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Sprache:eng
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Zusammenfassung:We propose that a photodetector based on nanotubes formed from layered structure may have a faster response than nanowires or nanobelts. The layered compound tungsten disulfide (WS2) can absorb visible and near-infrared lights. We fabricated photodetectors based on individual WS2 nanotubes. The photodetectors exhibited a remarkable response to excitation with 633 and 785 nm light. The nanotube-based photodetectors exhibited short rise and decay times of a few hundred μs, high on/off ratio, and high spectral responsivity and external quantum efficiency. Our results imply that WS2 nanotubes are prospective candidates for high-performance nanoscale optoelectronic devices.
ISSN:0003-6951
1077-3118
DOI:10.1063/1.4729144