Cureus | Heavily doped n-type PbSe and PbS nanocrystals using ground-state charge transfer from cobaltocene
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Research Article

Heavily doped n-type PbSe and PbS nanocrystals using ground-state charge transfer from cobaltocene

Weon-kyu Koh, Alexey Y. Koposov, John T. Stewart, Bhola N. Pal, Istvan Robel, Jeffrey M. Pietryga, Victor I. Klimov

Published: June 18, 2013

DOI: 10.1038/srep02004

License: Copyright © 2013, Macmillan Publishers Limited. All rights reserved2013Macmillan Publishers Limited. All rights reservedThis work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivs 3.0 Unported License. To view a copy of this license, visit http://creativecommons.org/licenses/by-nc-nd/3.0/

Abstract

Colloidal nanocrystals (NCs) of lead chalcogenides are a promising class of tunable infrared materials for applications in devices such as photodetectors and solar cells. Such devices typically employ electronic materials in which charge carrier concentrations are manipulated through “doping;” however, persistent electronic doping of these NCs remains a challenge. Here, we demonstrate that heavily doped n-type PbSe and PbS NCs can be realized utilizing ground-state electron transfer from cobaltocene. This allows injecting up to eight electrons per NC into the band-edge state and maintaining the doping level for at least a month at room temperature. Doping is confirmed by inter- and intra-band optical absorption, as well as by carrier dynamics. Finally, FET measurements of doped NC films and the demonstration of a p-n diode provide additional evidence that the developed doping procedure allows for persistent incorporation of electrons into the quantum-confined NC states.


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Scholarly Impact Quotient™ (SIQ™) is our unique post-publication peer review rating process. SIQ™ assesses article importance and quality by embracing the collective intelligence of the Cureus community-at-large. All registered users are invited to contribute to the SIQ™ of any published article. (Authors cannot rate their own articles.)

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