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

Makarovsky, Oleg and Turyanska, Lyudmila and Mori, Nobuya and Greenaway, Mark and Eaves, Laurence and Patané, Amalia and Fromhold, Mark and Lara-Avila, Samuel and Kubatkin, Sergey and Yakimova, Rositsa (2017) Enhancing optoelectronic properties of SiC-grown graphene by a surface layer of colloidal quantum dots. 2D Materials, 4 (3). 031001. ISSN 2053-1583

Full content URL: http://dx.doi.org/10.1088/2053-1583/aa76bb

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

Keywords:graphene, quantum dots, charge correlation
Subjects:F Physical Sciences > F200 Materials Science
Divisions:College of Science > School of Chemistry
ID Code:27684
Deposited On:20 Jun 2017 09:27

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