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Title: Nonblinking, intense two-dimensional light emitter: Monolayer WS 2 Triangles
Authors: Peimyoo, N.
Shang, J.
Cong, C.
Shen, X.
Wu, X.
Yeow, E.K.L.
Yu, T. 
Keywords: CVD
temperature dependence
Issue Date: 23-Dec-2013
Citation: Peimyoo, N., Shang, J., Cong, C., Shen, X., Wu, X., Yeow, E.K.L., Yu, T. (2013-12-23). Nonblinking, intense two-dimensional light emitter: Monolayer WS 2 Triangles. ACS Nano 7 (12) : 10985-10994. ScholarBank@NUS Repository.
Abstract: Monolayer WS2 (1L-WS2), with a direct band gap, provides an ideal platform to investigate unique properties of two-dimensional semiconductors. In this work, light emission of a 1L-WS2 triangle has been studied by using steady-state, time-resolved, and temperature-dependent photoluminescence (PL) spectroscopy. Two groups of 1L-WS2 triangles have been grown by chemical vapor deposition, which exhibit nonuniform and uniform PL, respectively. Observed nonuniform PL features, i.e., quenching and blue-shift in certain areas, are caused by structural imperfection and n-doping induced by charged defects. Uniform PL is found to be intrinsic, intense, and nonblinking, which are attributed to high crystalline quality. The binding energy of the A-exciton is extracted experimentally, which gives direct evidence for the large excitonic effect in 1L-WS2. These superior photon emission features make 1L-WS2 an appealing material for optoelectronic applications such as novel light-emitting and biosensing devices. © 2013 American Chemical Society.
Source Title: ACS Nano
ISSN: 19360851
DOI: 10.1021/nn4046002
Appears in Collections:Staff Publications

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