Confined-but-Connected Quantum Solids via Controlled Ligand Displacement

Handle URI:
http://hdl.handle.net/10754/597828
Title:
Confined-but-Connected Quantum Solids via Controlled Ligand Displacement
Authors:
Baumgardner, William J.; Whitham, Kevin; Hanrath, Tobias
Abstract:
Confined-but-connected quantum dot solids (QDS) combine the advantages of tunable, quantum-confined energy levels with efficient charge transport through enhanced electronic interdot coupling. We report the fabrication of QDS by treating self-assembled films of colloidal PbSe quantum dots with polar nonsolvents. Treatment with dimethylformamide balances the rates of self-assembly and ligand displacement to yield confined-but-connected QDS structures with cubic ordering and quasi-epitaxial interdot connections through facets of neighboring dots. The QDS structure was analyzed by a combination of transmission electron microscopy and wide-angle and small-angle X-ray scattering. Excitonic absorption signatures in optical spectroscopy confirm that quantum confinement is preserved. Transport measurements show significantly enhanced conductivity in treated films. © 2013 American Chemical Society.
Citation:
Baumgardner WJ, Whitham K, Hanrath T (2013) Confined-but-Connected Quantum Solids via Controlled Ligand Displacement. Nano Lett 13: 3225–3231. Available: http://dx.doi.org/10.1021/nl401298s.
Publisher:
American Chemical Society (ACS)
Journal:
Nano Letters
KAUST Grant Number:
KUS-C1-018-02
Issue Date:
10-Jul-2013
DOI:
10.1021/nl401298s
PubMed ID:
23777454
Type:
Article
ISSN:
1530-6984; 1530-6992
Sponsors:
This publication is based on work supported in part by Award No. KUS-C1-018-02, made by King Abdullah University of Science and Technology (KAUST). This work made use of the Cornell Center for Materials Research Shared Facilities which are supported through the NSF MRSEC program (DMR-1120296). X-ray scattering was conducted at the Cornell High Energy Synchrotron Source (CHESS) which is supported by the National Science Foundation and the National Institutes of Health/National Institute of General Medical Sciences under NSF award DMR-0936384. The authors thank Detlef Smilgies for assistance with structure characterization by X-ray scattering. W.B. was supported by Award No. KUS-C1-018-02, made by King Abdullah University of Science and Technology (KAUST). K.W. was supported by the Basic Energy Sciences Division of the Department of Energy through Grant ER46821 "Charge Transfer Across the Boundary of Photon-Harvesting Nanocrystals".
Appears in Collections:
Publications Acknowledging KAUST Support

Full metadata record

DC FieldValue Language
dc.contributor.authorBaumgardner, William J.en
dc.contributor.authorWhitham, Kevinen
dc.contributor.authorHanrath, Tobiasen
dc.date.accessioned2016-02-25T12:57:24Zen
dc.date.available2016-02-25T12:57:24Zen
dc.date.issued2013-07-10en
dc.identifier.citationBaumgardner WJ, Whitham K, Hanrath T (2013) Confined-but-Connected Quantum Solids via Controlled Ligand Displacement. Nano Lett 13: 3225–3231. Available: http://dx.doi.org/10.1021/nl401298s.en
dc.identifier.issn1530-6984en
dc.identifier.issn1530-6992en
dc.identifier.pmid23777454en
dc.identifier.doi10.1021/nl401298sen
dc.identifier.urihttp://hdl.handle.net/10754/597828en
dc.description.abstractConfined-but-connected quantum dot solids (QDS) combine the advantages of tunable, quantum-confined energy levels with efficient charge transport through enhanced electronic interdot coupling. We report the fabrication of QDS by treating self-assembled films of colloidal PbSe quantum dots with polar nonsolvents. Treatment with dimethylformamide balances the rates of self-assembly and ligand displacement to yield confined-but-connected QDS structures with cubic ordering and quasi-epitaxial interdot connections through facets of neighboring dots. The QDS structure was analyzed by a combination of transmission electron microscopy and wide-angle and small-angle X-ray scattering. Excitonic absorption signatures in optical spectroscopy confirm that quantum confinement is preserved. Transport measurements show significantly enhanced conductivity in treated films. © 2013 American Chemical Society.en
dc.description.sponsorshipThis publication is based on work supported in part by Award No. KUS-C1-018-02, made by King Abdullah University of Science and Technology (KAUST). This work made use of the Cornell Center for Materials Research Shared Facilities which are supported through the NSF MRSEC program (DMR-1120296). X-ray scattering was conducted at the Cornell High Energy Synchrotron Source (CHESS) which is supported by the National Science Foundation and the National Institutes of Health/National Institute of General Medical Sciences under NSF award DMR-0936384. The authors thank Detlef Smilgies for assistance with structure characterization by X-ray scattering. W.B. was supported by Award No. KUS-C1-018-02, made by King Abdullah University of Science and Technology (KAUST). K.W. was supported by the Basic Energy Sciences Division of the Department of Energy through Grant ER46821 "Charge Transfer Across the Boundary of Photon-Harvesting Nanocrystals".en
dc.publisherAmerican Chemical Society (ACS)en
dc.subjectcharge transporten
dc.subjectcouplingen
dc.subjectligand displacementen
dc.subjectnonsolventen
dc.subjectPbSeen
dc.subjectQuantum dotsen
dc.titleConfined-but-Connected Quantum Solids via Controlled Ligand Displacementen
dc.typeArticleen
dc.identifier.journalNano Lettersen
dc.contributor.institutionCornell University, Ithaca, United Statesen
kaust.grant.numberKUS-C1-018-02en

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