| Exciton Dynamics in Suspended Monolayer and Few-Layer MoS2 2D Crystals. | |
| | |
MedLine Citation:
|
PMID: 23273148 Owner: NLM Status: Publisher |
Abstract/OtherAbstract:
|
Femtosecond transient absorption spectroscopy and microscopy were employed to study exciton dynamics in suspended and Si3N4 substrate-supported monolayer and few-layer MoS2 2D crystals. Exciton dynamics for the monolayer and few-layer structures were found to be remarkably different from those of thick crystals when probed at energies near that of the lowest energy direct exciton (A exciton). The intraband relaxation rate was enhanced by more than 40 fold in the monolayer in comparison to that observed in the thick crystals, which we attributed to defect assisted scattering. Faster electron-hole recombination was found in monolayer and few-layer structures due to quantum confinement effects that lead to an indirect-direct band-gap crossover. Nonradiative rather than radiative relaxation pathways dominate the dynamics in the monolayer and few-layer MoS2. Fast trapping of excitons by surface trap states was observed in monolayer and few-layer structures, pointing to the importance of controlling surface properties in atomically thin crystals such as MoS2 along with controlling their dimensions. |
| | |
Authors:
|
Hongyan Shi; Rusen Yan; Simon Bertolazzi; Jacopo Brivio; Bo Gao; Andras Kis; Debdeep Jena; Huili Grace Xing; Libai Huang |
Related Documents
:
|
22523998 - Improvement in performances of dye-sensitized solar cell with sio2-coated tio2 photoele... 22463628 - New measurements of high-momentum nucleons and short-range structures in nuclei. 210198 - An ultrastructural study of the formation of "dark" and "light" cytoplasmic inclusions ... 23194158 - Hot electrons do the impossible: plasmon-induced dissociation of h2 on au. 11491258 - Corroded nitinol wires in explanted aortic endografts: an important mechanism of failure? 19392148 - Superconducting transition at 38 k in insulating-overdoped la2cuo4-la1.64sr0.36cuo4 sup... |
Publication Detail:
|
Type: JOURNAL ARTICLE Date: 2012-12-30 |
Journal Detail:
|
Title: ACS nano Volume: - ISSN: 1936-086X ISO Abbreviation: ACS Nano Publication Date: 2012 Dec |
Date Detail:
|
Created Date: 2012-12-31 Completed Date: - Revised Date: - |
Medline Journal Info:
|
Nlm Unique ID: 101313589 Medline TA: ACS Nano Country: - |
Other Details:
|
Languages: ENG Pagination: - Citation Subset: - |
Export Citation:
|
APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
|
|
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
Previous Document: (95)Mo Solid-State Nuclear Magnetic Resonance Spectroscopy and Quantum Simulations: Synergetic Tools...
Next Document: Numerical analysis of electron emission site distribution of carbon nanofibers for field emission pr...