Colloidal CuInSe2 nanocrystals: From gradient stoichiometry toward homogeneous alloyed structure mediated by conducting polymer P3HT

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DOIResolve DOI: http://doi.org/10.1021/am3032212
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TypeArticle
Journal titleACS Applied Materials and Interfaces
ISSN1944-8244
Volume5
Issue10
Pages41004106; # of pages: 7
SubjectComposition gradient; Copper-indium-selenide; Core shell structure; poly(3-hexyl thiophene); Polymer-assisted; Quaternary compound; Single-step synthesis; Tri-n-octylphosphine; Coordination reactions; Copper; Indium; Nanocrystals; Stoichiometry; Synthesis (chemical); Conducting polymers
AbstractWe report, for the first time, the synthesis of colloidal copper indium selenide (CuInSe2) nanocrystals (NCs) possessing a gradient stoichiometry that is potentially tunable by the presence of a conducting polymer, i.e., poly(3-hexyl thiophene) (P3HT) in the synthesis medium. Dibenzyl ether (DBE) was used as a reaction medium, whereas copper acetylacetonate (Cu(acac)2), indium acetylacetonate (In(acac)3), and selenium powder were used as Cu, In, and Se sources, respectively. The Se precursor was tri-n-octylphosphine selenide (TOP-Se). Without the presence of P3HT, the resulting NCs consist of a p-type (Cu1+ rich) core and an n-type (In3+ rich) shell. Such a gradient stoichiometry was moderated to be substantially more homogeneous because the presence of P3HT is believed to have significantly reduced the reactivity difference between Cu(acac) 2 and In(acac)3, as well as and their respective monomers. Furthermore, the P3HT also acts as a surface coordination species, contributing to the readily preparation of conducting polymer-NCs hybrids by a single-step synthesis. The understandings of this work can serve as a guide for design and synthesis of conducting polymer-NCs hybrids based on various ternary or quaternary compound semiconductors with different core-shell composition gradient. © 2013 American Chemical Society.
Publication date
LanguageEnglish
AffiliationNational Research Council Canada (NRC-CNRC); NRC Steacie Institute for Molecular Sciences (SIMS-ISSM)
Peer reviewedYes
NPARC number21269601
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Record identifierc215f983-9df2-4947-8ebf-c9a46af3fc10
Record created2013-12-13
Record modified2016-05-09
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