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나노 구조 물리 연구단
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Near-field spectral mapping of individual exciton complexes of monolayer WS2 correlated with local defects and charge population

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Title
Near-field spectral mapping of individual exciton complexes of monolayer WS2 correlated with local defects and charge population
Author(s)
Yongjun Lee; Seok Joon Yun; Young Bum Kim; Min Su Kim; Gang Hee Han; A. K. Sood; Jeongyong Kim
Publication Date
2017-02
Journal
Nanoscale, v.9, no.6, pp.2272 - 2278
Publisher
ROYAL SOC CHEMISTRY
Abstract
Exciton transitions are mostly responsible for the optical properties of transition metal dichalcogenide monolayers (1L-TMDs). Extensive studies of optical and structural characterization indicated that the presence of local structural defects and charge population critically influence the exciton emissions of 1L-TMDs. However, due to large variations of sample and experimental conditions, the exact mechanism of the exciton emission influenced by local structural defects and charge population is not clearly understood. In this work by using near-field scanning optical imaging and spectroscopy, we directly visualized spatially-and spectrally-resolved emission profiles of excitons, trions and defect bound excitons in CVD-grown monolayer tungsten disulfide (1L-WS2) with ∼70 nm spatial resolution. We found that exciton emission is spatially uniform while emission of trions and defect bound excitons was strongly modulated by the presence of structural features such as defects and wrinkles. We also visually observe a strong correlation between local charge accumulation and the trion formation upon increased photo-excitation. © The Royal Society of Chemistry
URI
https://pr.ibs.re.kr/handle/8788114/3461
ISSN
2040-3364
Appears in Collections:
Center for Integrated Nanostructure Physics(나노구조물리 연구단) > Journal Papers (저널논문)
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