Nature Nanotechnology, volume 7, issue 9, pages 577-582

Hybrid passivated colloidal quantum dot solids.

Alexander H. Ip 1
Susanna M Thon 1
Sjoerd Hoogland 1
Oleksandr Voznyy 1
David Zhitomirsky 1
Ratan Debnath 1
Larissa Levina 1
Lisa R Rollny 1
Graham H. Carey 1
Armin Fischer 1
Kyle W Kemp 1
Illan J Kramer 1
Zhijun Ning 1
Andre J Labelle 1
Kang Wei Chou 2
Aram Amassian 2
Edward H Sargent 1
Publication typeJournal Article
Publication date2012-07-29
Quartile SCImago
Q1
Quartile WOS
Q1
Impact factor38.3
ISSN17483387, 17483395
Atomic and Molecular Physics, and Optics
Condensed Matter Physics
General Materials Science
Electrical and Electronic Engineering
Bioengineering
Biomedical Engineering
Abstract
Colloidal quantum dot (CQD) films allow large-area solution processing and bandgap tuning through the quantum size effect. However, the high ratio of surface area to volume makes CQD films prone to high trap state densities if surfaces are imperfectly passivated, promoting recombination of charge carriers that is detrimental to device performance. Recent advances have replaced the long insulating ligands that enable colloidal stability following synthesis with shorter organic linkers or halide anions, leading to improved passivation and higher packing densities. Although this substitution has been performed using solid-state ligand exchange, a solution-based approach is preferable because it enables increased control over the balance of charges on the surface of the quantum dot, which is essential for eliminating midgap trap states. Furthermore, the solution-based approach leverages recent progress in metal:chalcogen chemistry in the liquid phase. Here, we quantify the density of midgap trap states in CQD solids and show that the performance of CQD-based photovoltaics is now limited by electron-hole recombination due to these states. Next, using density functional theory and optoelectronic device modelling, we show that to improve this performance it is essential to bind a suitable ligand to each potential trap site on the surface of the quantum dot. We then develop a robust hybrid passivation scheme that involves introducing halide anions during the end stages of the synthesis process, which can passivate trap sites that are inaccessible to much larger organic ligands. An organic crosslinking strategy is then used to form the film. Finally, we use our hybrid passivated CQD solid to fabricate a solar cell with a certified efficiency of 7.0%, which is a record for a CQD photovoltaic device.

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Ip A. H. et al. Hybrid passivated colloidal quantum dot solids. // Nature Nanotechnology. 2012. Vol. 7. No. 9. pp. 577-582.
GOST all authors (up to 50) Copy
Ip A. H., Thon S. M., Hoogland S., Voznyy O., Zhitomirsky D., Debnath R., Levina L., Rollny L. R., Carey G. H., Fischer A., Kemp K. W., Kramer I. J., Ning Z., Labelle A. J., Chou K. W., Amassian A., Sargent E. H. Hybrid passivated colloidal quantum dot solids. // Nature Nanotechnology. 2012. Vol. 7. No. 9. pp. 577-582.
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RIS Copy
TY - JOUR
DO - 10.1038/nnano.2012.127
UR - https://doi.org/10.1038/nnano.2012.127
TI - Hybrid passivated colloidal quantum dot solids.
T2 - Nature Nanotechnology
AU - Ip, Alexander H.
AU - Thon, Susanna M
AU - Hoogland, Sjoerd
AU - Voznyy, Oleksandr
AU - Zhitomirsky, David
AU - Debnath, Ratan
AU - Levina, Larissa
AU - Rollny, Lisa R
AU - Carey, Graham H.
AU - Fischer, Armin
AU - Kemp, Kyle W
AU - Kramer, Illan J
AU - Ning, Zhijun
AU - Labelle, Andre J
AU - Chou, Kang Wei
AU - Amassian, Aram
AU - Sargent, Edward H
PY - 2012
DA - 2012/07/29 00:00:00
PB - Springer Nature
SP - 577-582
IS - 9
VL - 7
SN - 1748-3387
SN - 1748-3395
ER -
BibTex |
Cite this
BibTex Copy
@article{2012_Ip,
author = {Alexander H. Ip and Susanna M Thon and Sjoerd Hoogland and Oleksandr Voznyy and David Zhitomirsky and Ratan Debnath and Larissa Levina and Lisa R Rollny and Graham H. Carey and Armin Fischer and Kyle W Kemp and Illan J Kramer and Zhijun Ning and Andre J Labelle and Kang Wei Chou and Aram Amassian and Edward H Sargent},
title = {Hybrid passivated colloidal quantum dot solids.},
journal = {Nature Nanotechnology},
year = {2012},
volume = {7},
publisher = {Springer Nature},
month = {jul},
url = {https://doi.org/10.1038/nnano.2012.127},
number = {9},
pages = {577--582},
doi = {10.1038/nnano.2012.127}
}
MLA
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MLA Copy
Ip, Alexander H., et al. “Hybrid passivated colloidal quantum dot solids..” Nature Nanotechnology, vol. 7, no. 9, Jul. 2012, pp. 577-582. https://doi.org/10.1038/nnano.2012.127.
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