Journal
ACS NANO
Volume 7, Issue 12, Pages 10985-10994Publisher
AMER CHEMICAL SOC
DOI: 10.1021/nn4046002
Keywords
WS2; photoluminescence; CVD; microspectroscopy; temperature dependence
Categories
Funding
- Singapore National Research Foundation under NRF [NRF-RF2010-07]
- MOE [MOE2012-T2-2-049]
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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.
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