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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

Enhancing optoelectronic properties of SiC-grown graphene by a surface layer of colloidal quantum dots Thumbnail


Authors

N. Mori

Mark Greenaway

Laurence Eaves

Amalia Patan�

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., Fromhold, M., Lara-Avila, S., Kubatkin, S., & 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 Jun 19, 2017
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
Contract Date Jun 6, 2017

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