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Advanced Electronic Materials, volume 1, issue 7, pages 1500062

Ligand‐Induced Control of Photoconductive Gain and Doping in a Hybrid Graphene–Quantum Dot Transistor

Lyudmila Turyanska 1
O.N. Makarovsky 1
Simon A Svatek 1
P.H. Beton 1
C. J. Mellor 1
A. Patane 1
L J. Eaves 1
N R Thomas 2
Michael Fay 3
Alexander J. Marsden 4
Neil Wilson 4
Publication typeJournal Article
Publication date2015-06-05
Quartile SCImago
Q1
Quartile WOS
Q1
Impact factor6.2
ISSN2199160X, 2199160X
Electronic, Optical and Magnetic Materials
Abstract
Recent advances in graphene-based electronics range from the discovery of fundamental physical phenomena to the development of new high-performance photosensitive devices. [ 1–5 ] These applications exploit not only the unique electronic properties of graphene but also additional functionalities that can be achieved by capping the graphene layer with another material or nanostructure, e.g., atomically thin fi lms, [ 6,7 ] carbon nanotubes [ 8 ] or inorganic nanoparticles. [ 8–10 ] Colloidal semiconductor quantum dots (QDs) are of particular interest as their optical properties can be fi ne-tuned by varying their size and/or composition. [ 11 ] In addition, colloidal synthesis enables QDs to be functionalized by doping [ 12 ] and/or surface encapsulation. [ 13 ] Recently, a photoresponsivity of 10 7 A W −1 was achieved by depositing QDs on graphene and explained in terms of trapping of photoexcited carriers on the QDs and charge transfer between them and the graphene layer. [ 9,10 ] This mechanism should be strongly dependent on the interface between the QDs and graphene. Furthermore, the ligands that encapsulate the QDs may provide a means of modifying the transfer of electronic charges and enhancing the electronic properties of the graphene layer. Here, we investigate the properties of single layer graphene (SLG) functionalized with an overlayer of near-infrared PbS colloidal quantum dots capped with thioglycerol/dithioglycerol or polyethylene glycol (PEG500 and PEG2000). We demonstrate that the polarity of the conductivity and the carrier concentration can be modifi ed, and photoresponsivity of SLG can be signifi cantly enhanced by the choice of ligands. By reducing the length of capping ligands, hence the thickness of the dielectric barrier between the QDs and the SLG, and by preserving the integrity of the ligand layer, we achieve the effi - cient transfer of photogenerated carriers from the QDs to the graphene before recombining, resulting in enhanced photoresponsivities of up to ≈10 9 A W −1 .

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Turyanska L. et al. Ligand‐Induced Control of Photoconductive Gain and Doping in a Hybrid Graphene–Quantum Dot Transistor // Advanced Electronic Materials. 2015. Vol. 1. No. 7. p. 1500062.
GOST all authors (up to 50) Copy
Turyanska L., Makarovsky O., Svatek S. A., Beton P., Mellor C. J., Patane A., Eaves L. J., Thomas N. R., Fay M., Marsden A. J., Wilson N. Ligand‐Induced Control of Photoconductive Gain and Doping in a Hybrid Graphene–Quantum Dot Transistor // Advanced Electronic Materials. 2015. Vol. 1. No. 7. p. 1500062.
RIS |
Cite this
RIS Copy
TY - JOUR
DO - 10.1002/aelm.201500062
UR - https://doi.org/10.1002/aelm.201500062
TI - Ligand‐Induced Control of Photoconductive Gain and Doping in a Hybrid Graphene–Quantum Dot Transistor
T2 - Advanced Electronic Materials
AU - Turyanska, Lyudmila
AU - Makarovsky, O.N.
AU - Svatek, Simon A
AU - Beton, P.H.
AU - Mellor, C. J.
AU - Patane, A.
AU - Eaves, L J.
AU - Thomas, N R
AU - Fay, Michael
AU - Marsden, Alexander J.
AU - Wilson, Neil
PY - 2015
DA - 2015/06/05 00:00:00
PB - Wiley
SP - 1500062
IS - 7
VL - 1
SN - 2199-160X
SN - 2199-160X
ER -
BibTex |
Cite this
BibTex Copy
@article{2015_Turyanska,
author = {Lyudmila Turyanska and O.N. Makarovsky and Simon A Svatek and P.H. Beton and C. J. Mellor and A. Patane and L J. Eaves and N R Thomas and Michael Fay and Alexander J. Marsden and Neil Wilson},
title = {Ligand‐Induced Control of Photoconductive Gain and Doping in a Hybrid Graphene–Quantum Dot Transistor},
journal = {Advanced Electronic Materials},
year = {2015},
volume = {1},
publisher = {Wiley},
month = {jun},
url = {https://doi.org/10.1002/aelm.201500062},
number = {7},
pages = {1500062},
doi = {10.1002/aelm.201500062}
}
MLA
Cite this
MLA Copy
Turyanska, Lyudmila, et al. “Ligand‐Induced Control of Photoconductive Gain and Doping in a Hybrid Graphene–Quantum Dot Transistor.” Advanced Electronic Materials, vol. 1, no. 7, Jun. 2015, p. 1500062. https://doi.org/10.1002/aelm.201500062.
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