Please use this identifier to cite or link to this item: https://doi.org/10.1021/nn305275h
DC FieldValue
dc.titleEvolution of electronic structure in atomically thin sheets of ws 2 and wse2
dc.contributor.authorZhao, W.
dc.contributor.authorGhorannevis, Z.
dc.contributor.authorChu, L.
dc.contributor.authorToh, M.
dc.contributor.authorKloc, C.
dc.contributor.authorTan, P.-H.
dc.contributor.authorEda, G.
dc.date.accessioned2014-10-16T09:24:33Z
dc.date.available2014-10-16T09:24:33Z
dc.date.issued2013-01-22
dc.identifier.citationZhao, W., Ghorannevis, Z., Chu, L., Toh, M., Kloc, C., Tan, P.-H., Eda, G. (2013-01-22). Evolution of electronic structure in atomically thin sheets of ws 2 and wse2. ACS Nano 7 (1) : 791-797. ScholarBank@NUS Repository. https://doi.org/10.1021/nn305275h
dc.identifier.issn19360851
dc.identifier.urihttp://scholarbank.nus.edu.sg/handle/10635/96532
dc.description.abstractGeometrical confinement effect in exfoliated sheets of layered materials leads to significant evolution of energy dispersion in mono- to few-layer thickness regime. Molybdenum disulfide (MoS2) was recently found to exhibit indirect-to-direct gap transition when the thickness is reduced to a single monolayer. Emerging photoluminescence (PL) from monolayer MoS2 opens up opportunities for a range of novel optoelectronic applications of the material. Here we report differential reflectance and PL spectra of mono- to few-layer WS2 and WSe2 that indicate that the band structure of these materials undergoes similar indirect-to-direct gap transition when thinned to a single monolayer. The transition is evidenced by distinctly enhanced PL peak centered at 630 and 750 nm in monolayer WS2 and WSe2, respectively. Few-layer flakes are found to exhibit comparatively strong indirect gap emission along with direct gap hot electron emission, suggesting high quality of synthetic crystals prepared by a chemical vapor transport method. Fine absorption and emission features and their thickness dependence suggest a strong effect of Se p-orbitals on the d electron band structure as well as interlayer coupling in WSe2. © 2012 American Chemical Society.
dc.description.urihttp://libproxy1.nus.edu.sg/login?url=http://dx.doi.org/10.1021/nn305275h
dc.sourceScopus
dc.subject2D crystals
dc.subjectphotoluminescence
dc.subjectWS2
dc.subjectWSe2
dc.typeArticle
dc.contributor.departmentPHYSICS
dc.description.doi10.1021/nn305275h
dc.description.sourcetitleACS Nano
dc.description.volume7
dc.description.issue1
dc.description.page791-797
dc.identifier.isiut000314082800085
Appears in Collections:Staff Publications

Show simple item record
Files in This Item:
There are no files associated with this item.

SCOPUSTM   
Citations

1,168
checked on Nov 30, 2020

WEB OF SCIENCETM
Citations

1,045
checked on Nov 30, 2020

Page view(s)

78
checked on Nov 29, 2020

Google ScholarTM

Check

Altmetric


Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.