OLEG MAKAROVSKIY Oleg.Makarovsky@nottingham.ac.uk
Associate Professor
Enhancing optoelectronic properties of SiC-grown graphene by a surface layer of colloidal quantum dots
Makarovsky, Oleg; Turyanska, Lyudmila; Mori, N.; Greenaway, Mark; Eaves, Laurence; Patan�, Amalia; Fromhold, Mark; Lara-Avila, Samuel; Kubatkin, Sergey; Yakimova, Rositsa
Authors
Dr LYUDMILA TURYANSKA LYUDMILA.TURYANSKA@NOTTINGHAM.AC.UK
Associate Professor
N. Mori
Mark Greenaway
LAURENCE EAVES laurence.eaves@nottingham.ac.uk
Research Professor
Amalia Patan�
MARK FROMHOLD mark.fromhold@nottingham.ac.uk
Professor of Physics
Samuel Lara-Avila
Sergey Kubatkin
Rositsa Yakimova
Abstract
We report a simultaneous increase of carrier concentration, mobility and photoresponsivity when SiC-grown graphene is decorated with a surface layer of colloidal PbS quantum dots, which act as electron donors. The charge on the ionised dots is spatially correlated with defect charges on the SiC-graphene interface, thus enhancing both electron carrier density and mobility. This charge-correlation model is supported by Monte Carlo simulations of electron transport and used to explain the unexpected 3-fold increase of mobility with increasing electron density. The enhanced carrier concentration and mobility give rise to Shubnikov-de Haas oscillations in the magnetoresistance, which provide an estimate of the electron cyclotron mass in graphene at high densities and Fermi energies up to 1.2 × 1013 cm-2 and 400 meV, respectively.
Citation
Makarovsky, O., Turyanska, L., Mori, N., Greenaway, M., Eaves, L., Patanè, A., …Yakimova, R. (in press). Enhancing optoelectronic properties of SiC-grown graphene by a surface layer of colloidal quantum dots. 2D Materials, 4(3), https://doi.org/10.1088/2053-1583/aa76bb
Journal Article Type | Article |
---|---|
Acceptance Date | Jun 2, 2017 |
Online Publication Date | Jun 19, 2017 |
Deposit Date | Jun 6, 2017 |
Publicly Available Date | Mar 29, 2024 |
Journal | 2D Materials |
Electronic ISSN | 2053-1583 |
Publisher | IOP Publishing |
Peer Reviewed | Peer Reviewed |
Volume | 4 |
Issue | 3 |
DOI | https://doi.org/10.1088/2053-1583/aa76bb |
Keywords | SiC-graphene, Unipolar charge correlation, Colloidal quantum dots, Monte Carlo simulations |
Public URL | https://nottingham-repository.worktribe.com/output/866859 |
Publisher URL | http://iopscience.iop.org/article/10.1088/2053-1583/aa76bb/meta |
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Copyright information regarding this work can be found at the following address: http://creativecommons.org/licenses/by/4.0
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Copyright Statement
Copyright information regarding this work can be found at the following address: http://creativecommons.org/licenses/by/4.0
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