Journal
JOURNAL OF CHEMICAL PHYSICS
Volume 151, Issue 16, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.5124898
Keywords
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Funding
- European Commission via the Marie-Sklodowska Curie action Phonsi [H2020-MSCA-ITN-642656]
- Research Foundation Flanders [17006602]
- Ghent University (GOA) [01G01513]
- China Scholarship Council (CSC)
- FWO-Vlaanderen
- Ghent University BOF
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In recent years, hot injection synthesis has emerged as a promising route for the production of nanostructured transition metal dichalcogenides, in large due to its better control over the crystallinity and monodispersity compared to other solution based methods. Understanding the photophysics of excitons in the thus obtained colloidal nanosheets is of great importance to explore their potential for applications in optoelectronics. Here, we study the carrier dynamics in these few-layer colloidal WS2 nanosheets by use of broadband transient absorption spectroscopy. The dynamics of both the bleach, linewidth broadening and energy shift across the entire visible and near-infrared spectrum, allows us to identify subpicosecond electron trapping as the main carrier loss channel. A more quantitative analysis shows that the intrinsic properties of colloidally synthesized nanosheets are on par with other synthesis methods, paving the way for this method to produce high quality nanosheets. Published under license by AIP Publishing.
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