ACS Nano, volume 8, issue 12, pages 12883-12894

High Infrared Photoconductivity in Films of Arsenic-Sulfide-Encapsulated Lead-Sulfide Nanocrystals

Sergii Yakunin 1, 2, 3
Dmitry N. Dirin 2, 3
Loredana Protesescu 2, 3
Mykhailo Sytnyk 1
Sajjad Tollabimazraehno 4
Markus Humer 1
Florian Hackl 1
Thomas Fromherz 1
Wolfgang Heiss 1, 5, 6
1
 
Institute of Semiconductor and Solid State Physics, Johannes Kepler University Linz, Altenbergerstraße 69, Linz 4040, Austria
4
 
Zentrum für Oberflächen- und Nanoanalytik, University Linz, Altenbergerstraße 69, Linz 4040, Austria
6
 
Energie Campus Nürnberg (EnCN), Fürther Straße 250, 90429 Nürnberg, Germany
Publication typeJournal Article
Publication date2014-12-08
Journal: ACS Nano
Quartile SCImago
Q1
Quartile WOS
Q1
Impact factor17.1
ISSN19360851, 1936086X
General Physics and Astronomy
General Materials Science
General Engineering
Abstract
Highly photoconductive thin films of inorganic-capped PbS nanocrystal quantum dots (QDs) are reported. Stable colloidal dispersions of (NH4)3AsS3-capped PbS QDs were processed by a conventional dip-coating technique into a thin homogeneous film of electronically coupled PbS QDs. Upon drying at 130 °C, (NH4)3AsS3 capping ligands were converted into a thin layer of As2S3, acting as an infrared-transparent semiconducting glue. Photodetectors obtained by depositing such films onto glass substrates with interdigitate electrode structures feature extremely high light responsivity and detectivity with values of more than 200 A/W and 1.2×10(13) Jones, respectively, at infrared wavelengths up to 1400 nm. Importantly, these devices were fabricated and tested under ambient atmosphere. Using a set of time-resolved optoelectronic experiments, the important role played by the carrier trap states, presumably localized on the arsenic-sulfide surface coating, has been elucidated. Foremost, these traps enable a very high photoconductive gain of at least 200. The trap state density as a function of energy has been plotted from the frequency dependence of the photoinduced absorption (PIA), whereas the distribution of lifetimes of these traps was recovered from PIA and photoconductivity (PC) phase spectra. These trap states also have an important impact on carrier dynamics, which led us to propose a kinetic model for trap state filling that consistently describes the experimental photoconductivity transients at various intensities of excitation light. This model also provides realistic values for the photoconductive gain and thus may serve as a useful tool to describe photoconductivity in nanocrystal-based solids.

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Yakunin S. et al. High Infrared Photoconductivity in Films of Arsenic-Sulfide-Encapsulated Lead-Sulfide Nanocrystals // ACS Nano. 2014. Vol. 8. No. 12. pp. 12883-12894.
GOST all authors (up to 50) Copy
Yakunin S., Dirin D. N., Protesescu L., Sytnyk M., Tollabimazraehno S., Humer M., Hackl F., Fromherz T., Bodnarchuk M. I., Kovalenko M. V., Heiss W. High Infrared Photoconductivity in Films of Arsenic-Sulfide-Encapsulated Lead-Sulfide Nanocrystals // ACS Nano. 2014. Vol. 8. No. 12. pp. 12883-12894.
RIS |
Cite this
RIS Copy
TY - JOUR
DO - 10.1021/nn5067478
UR - https://doi.org/10.1021/nn5067478
TI - High Infrared Photoconductivity in Films of Arsenic-Sulfide-Encapsulated Lead-Sulfide Nanocrystals
T2 - ACS Nano
AU - Tollabimazraehno, Sajjad
AU - Humer, Markus
AU - Hackl, Florian
AU - Yakunin, Sergii
AU - Dirin, Dmitry N.
AU - Protesescu, Loredana
AU - Sytnyk, Mykhailo
AU - Fromherz, Thomas
AU - Bodnarchuk, Maryna I.
AU - Kovalenko, Maksym V.
AU - Heiss, Wolfgang
PY - 2014
DA - 2014/12/08 00:00:00
PB - American Chemical Society (ACS)
SP - 12883-12894
IS - 12
VL - 8
SN - 1936-0851
SN - 1936-086X
ER -
BibTex |
Cite this
BibTex Copy
@article{2014_Yakunin,
author = {Sajjad Tollabimazraehno and Markus Humer and Florian Hackl and Sergii Yakunin and Dmitry N. Dirin and Loredana Protesescu and Mykhailo Sytnyk and Thomas Fromherz and Maryna I. Bodnarchuk and Maksym V. Kovalenko and Wolfgang Heiss},
title = {High Infrared Photoconductivity in Films of Arsenic-Sulfide-Encapsulated Lead-Sulfide Nanocrystals},
journal = {ACS Nano},
year = {2014},
volume = {8},
publisher = {American Chemical Society (ACS)},
month = {dec},
url = {https://doi.org/10.1021/nn5067478},
number = {12},
pages = {12883--12894},
doi = {10.1021/nn5067478}
}
MLA
Cite this
MLA Copy
Yakunin, Sergii, et al. “High Infrared Photoconductivity in Films of Arsenic-Sulfide-Encapsulated Lead-Sulfide Nanocrystals.” ACS Nano, vol. 8, no. 12, Dec. 2014, pp. 12883-12894. https://doi.org/10.1021/nn5067478.
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