Halide-Amine Co-Passivated Indium Phosphide Colloidal Quantum Dots in Tetrahedral Shape

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Wet chemical synthesis of covalent III-V colloidal quantum dots (CQDs) has been challenging because of uncontrolled surfaces and a poor understanding of surface-ligand interactions. We report a simple acid-free approach to synthesize highly crystalline indium phosphide CQDs in the unique tetrahedral shape by using tris(dimethylamino) phosphine and indium trichloride as the phosphorus and indium precursors, dissolved in oleylamine. Our chemical analyses indicate that both the oleylamine and chloride ligands participate in the stabilization of tetrahedral-shaped InP CQDs covered with cation-rich (111) facets. Based on density functional theory calculations, we propose that fractional dangling electrons of the In-rich (111) surface could be completely passivated by three halide and one primary amine ligands per the (2x2) surface unit, satisfying the 8-electron rule. This halide-amine co-passivation strategy will benefit the synthesis of stable III-V CQDs with controlled surfaces.
Publisher
WILEY-V C H VERLAG GMBH
Issue Date
2016-02
Language
English
Article Type
Article
Keywords

RAY PHOTOELECTRON-SPECTROSCOPY; LIGHT-EMITTING-DIODES; INP/ZNS NANOCRYSTALS; INP; PRECURSOR; SURFACE; STABILITY; CHEMISTRY; EMISSION; PARTICLE

Citation

ANGEWANDTE CHEMIE-INTERNATIONAL EDITION, v.55, no.11, pp.3714 - 3718

ISSN
1433-7851
DOI
10.1002/anie.201600289
URI
http://hdl.handle.net/10203/208331
Appears in Collection
NT-Journal Papers(저널논문)
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