NDLI: Near-field spectral mapping of individual exciton complexes of monolayer WS<sub>2</sub> correlated with local defects and charge population

Content Provider	Royal Society of Chemistry (RSC)
Author	Yun, Seok Joon Sood, A. K. Lee, Yongjun Kim, Jeongyong Kim, Youngbum Kim, Min Su Han, Gang Hee
Copyright Year	2017
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.
Starting Page	2272
Ending Page	2278
Page Count	7
File Format	HTM / HTML PDF
ISSN	20403364
Volume Number	9
Issue Number	6
Journal	Nanoscale
DOI	10.1039/c6nr08813a
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	Chalcogenide Spectroscopy Exciton Molybdenum disulfide Medical optical imaging Tungsten
Content Type	Text
Resource Type	Article
Subject	Nanoscience and Nanotechnology

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