4.5 Article

Improving the Field-Effect Performance of Bi2S3 Single Nanowires by an Asymmetric Device Fabrication

Journal

CHEMPHYSCHEM
Volume 16, Issue 1, Pages 99-103

Publisher

WILEY-V C H VERLAG GMBH
DOI: 10.1002/cphc.201402594

Keywords

asymmetric electrodes; band alignment; Bi2S3 nanowires; carrier mobility; photoresponse

Funding

  1. National Natural Science Foundation of China [91233120]
  2. National Basic Research Program of China [2011CB921901]

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High-quality Bi2S3 nanowires are synthesized by chemical vapor deposition and their intrinsic photoresponsive and field-effect characteristics are explored in detail. Among the studied Au-Au, Ag-Ag, and Au-Ag electrode pairs, the device with stepwise band alignment of asymmetric Au-Ag electrodes has the highest mobility. Furthermore, it is shown that light can cause a sevenfold decrease of the on/off ratio. This can be explained by the photoexcited charge carriers that are more beneficial to the increase of I-off than I-on. The photoresponsive properties of the asymmetric Au-Ag electrode devices were also explored, and the results show a photoconductive gain of seven with a rise time of 2.9 s and a decay time of 1.6 s.

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