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

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

doi:10.1038/srep02004

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

Journal Article · Tue Jun 18 00:00:00 EDT 2013 · Scientific Reports

DOI:https://doi.org/10.1038/srep02004· OSTI ID:1382294

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

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.

Research Organization:: Energy Frontier Research Centers (EFRC) (United States). Center for Advanced Solar Photophysics (CASP)

Sponsoring Organization:: USDOE SC Office of Basic Energy Sciences (SC-22)

DOE Contract Number:: AC52-06NA25396

OSTI ID:: 1382294

Journal Information:: Scientific Reports, Journal Name: Scientific Reports Journal Issue: 1 Vol. 3; ISSN 2045-2322

Publisher:: Nature Publishing Group

Country of Publication:: United States

Language:: English

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