期刊
NANO LETTERS
卷 14, 期 11, 页码 6202-6209出版社
AMER CHEMICAL SOC
DOI: 10.1021/nl5024854
关键词
plasmon; hot electron; nanowire; Au nanorod; photodetector
类别
资金
- European Commission [265073, 263091]
- Science Foundation Ireland [SFI/09RFP/CAP2455, 10/IN.1/I3000]
- Irish Higher Education Authority
- Science Foundation Ireland (SFI) [10/IN.1/I3000] Funding Source: Science Foundation Ireland (SFI)
In this Letter, we present a new class of near-infrared photodetectors comprising Au nanorods-ZnO nanowire hybrid systems. Fabricated hybrid FET devices showed a large photoresponse under radiation wavelengths between 650 and 850 nm, accompanied by an ultrafast transient with a time scale of 250 ms, more than 1 order of magnitude faster than the ZnO response under radiation above band gap. The generated photocurrent is ascribed to plasmonic-mediated generation of hot electrons at the metal-semiconductor Schottky barrier. In the presented architecture, Au-nanorod-localized surface plasmons were used as active elements for generating and injecting hot electrons into the wide band gap ZnO nanowire, functioning as a passive component for charge collection. A detailed investigation of the hot electron generation and injection processes is discussed to explain the improved and extended performance of the hybrid device. The quantum efficiency measured at 650 nm was calculated to be approximately 3%, more than 30 times larger than values reported for equivalent metal/semiconductor planar photodetectors. The presented work is extremely promising for further development of novel miniaturized, tunable photodetectors and for highly efficient plasmonic energy conversion devices.
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