ACS Nano, volume 6, issue 9, pages 8448-8455

A charge-orbital balance picture of doping in colloidal quantum dot solids.

David Zhitomirsky 1
Zhijun Ning 1
Edward H Sargent 1
1
 
Department of Electrical and Computer Engineering, University of Toronto, 10 King’s College Road, Toronto, Ontario, M5S 3G4, Canada
Publication typeJournal Article
Publication date2012-09-07
Journal: ACS Nano
Quartile SCImago
Q1
Quartile WOS
Q1
Impact factor17.1
ISSN19360851, 1936086X
General Physics and Astronomy
General Materials Science
General Engineering
Abstract
We present a framework--validated using both modeling and experiment--to predict doping in CQD films. In the ionic semiconductors widely deployed in CQD films, the framework reduces to a simple accounting of the contributions of the oxidation state of each constituent, including both inorganic species and organic ligands. We use density functional theory simulations to confirm that the type of doping can be reliably predicted based on the overall stoichiometry of the CQDs, largely independent of microscopic geometrical bonding configurations. Studies employing field-effect transistors constructed from CQDs that have undergone various chemical treatments, coupled with Rutherford backscattering and X-ray photoelectron spectroscopy to provide compositional analysis, allow us to test and confirm the proposed model in an experimental framework. We investigate both p- and n-type electronic doping spanning a wide range of carrier concentrations from 10(16) cm(-3) to over 10(18) cm(-3), and demonstrate reversible switching between p- and n-type doping by changing the CQD stoichiometry. We show that the summation of the contributions from all cations and anions within the film can be used to predict accurately the majority carrier type. The findings enable predictable control over majority carrier concentration via tuning of the overall stoichiometry.

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GOST |
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GOST Copy
Voznyy O. et al. A charge-orbital balance picture of doping in colloidal quantum dot solids. // ACS Nano. 2012. Vol. 6. No. 9. pp. 8448-8455.
GOST all authors (up to 50) Copy
Voznyy O., Zhitomirsky D., Stadler P., Ning Z., Hoogland S., Sargent E. H. A charge-orbital balance picture of doping in colloidal quantum dot solids. // ACS Nano. 2012. Vol. 6. No. 9. pp. 8448-8455.
RIS |
Cite this
RIS Copy
TY - JOUR
DO - 10.1021/nn303364d
UR - https://doi.org/10.1021/nn303364d
TI - A charge-orbital balance picture of doping in colloidal quantum dot solids.
T2 - ACS Nano
AU - Zhitomirsky, David
AU - Voznyy, Oleksandr
AU - Stadler, Philipp
AU - Ning, Zhijun
AU - Hoogland, Sjoerd
AU - Sargent, Edward H
PY - 2012
DA - 2012/09/07 00:00:00
PB - American Chemical Society (ACS)
SP - 8448-8455
IS - 9
VL - 6
SN - 1936-0851
SN - 1936-086X
ER -
BibTex |
Cite this
BibTex Copy
@article{2012_Voznyy,
author = {David Zhitomirsky and Oleksandr Voznyy and Philipp Stadler and Zhijun Ning and Sjoerd Hoogland and Edward H Sargent},
title = {A charge-orbital balance picture of doping in colloidal quantum dot solids.},
journal = {ACS Nano},
year = {2012},
volume = {6},
publisher = {American Chemical Society (ACS)},
month = {sep},
url = {https://doi.org/10.1021/nn303364d},
number = {9},
pages = {8448--8455},
doi = {10.1021/nn303364d}
}
MLA
Cite this
MLA Copy
Voznyy, Oleksandr, et al. “A charge-orbital balance picture of doping in colloidal quantum dot solids..” ACS Nano, vol. 6, no. 9, Sep. 2012, pp. 8448-8455. https://doi.org/10.1021/nn303364d.
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