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Improving the Field‐Effect Performance of Bi 2 S 3 Single Nanowires by an Asymmetric Device Fabrication
Author(s) -
Lu Fangyuan,
Li Renxiong,
Li Yan,
Huo Nengjie,
Yang Juehan,
Li Yongtao,
Li Bo,
Yang Shengxue,
Wei Zhongming,
Li Jingbo
Publication year - 2015
Publication title -
chemphyschem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.016
H-Index - 140
eISSN - 1439-7641
pISSN - 1439-4235
DOI - 10.1002/cphc.201402594
Subject(s) - nanowire , electrode , fabrication , photoconductivity , materials science , chemical vapor deposition , optoelectronics , deposition (geology) , electron mobility , nanotechnology , electric field , chemistry , medicine , paleontology , alternative medicine , physics , pathology , quantum mechanics , sediment , biology
High‐quality Bi 2 S 3 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.