Effect of correlation and dielectric confinement on 1S1/2(e)nS3/2(h)Excitons in CdTe/CdSe and CdSe/CdTe Type-II quantum dots

Tyrrell, EJ; Tomic, S

Abstract

Controlled reduction of graphene oxide is an alternative and promising method to tune the electronic and optically active energy gap of this two-dimensional material in the energy range of the visible light spectrum. By means of ab initio calculations, based on hybrid density functional theory, that combine the Hartree–Fock method with the generalized gradient approximation (GGA), we investigated the electronic, optical, and radiative recombination properties of partially reduced graphene oxide, modelled as small islands of pristine graphene formed in an infinite sheet of graphene oxide. We predict that tuning of optically active gaps, in the wide range from ∼6.5 eV to ∼0.25 eV, followed by the electron radiative transition times in the range from ns to μs, can be effected by controlling the level of oxidization.

Citation

Tyrrell, E., & Tomic, S. (2015). Effect of correlation and dielectric confinement on 1S1/2(e)nS3/2(h)Excitons in CdTe/CdSe and CdSe/CdTe Type-II quantum dots. Journal of Physical Chemistry C, 119(22), 12720-12730. https://doi.org/10.1021/acs.jpcc.5b02789

• Journal Article Type: Article
• Acceptance Date: Jun 6, 2015
• Publication Date: May 5, 2015
• Deposit Date: Dec 8, 2015
• Publicly Available Date: Apr 5, 2016
• Journal: The Journal of Physical Chemistry C
• Print ISSN: 1932-7447
• Publisher: American Chemical Society
• Volume: 119
• Issue: 22
• Pages: 12720-12730
• DOI: https://doi.org/10.1021/acs.jpcc.5b02789
• Publisher URL: http://dx.doi.org/10.1021/acs.jpcc.5b02789
• Related Public URLs: http://pubs.rsc.org/en/journals/journalissues/tc#!recentarticles&all
• Additional Information: Funders : Engineering and Physical Sciences Research Council (EPSRC);EU-COST project “MultiscaleSolar” (MP1406);The Great Britain Sasakawa Foundation