Volume 128, Issue 11 pp. 3778-3782
Zuschrift

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

Kyungnam Kim

Kyungnam Kim

Nanomechanical Systems Research Division, Korea Institute of Machinery and Materials, Daejeon, 34103 Korea

These authors contributed equally to this work.

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Dongsuk Yoo

Dongsuk Yoo

Graduate School of Nanoscience and Technology, Korea Advanced Institute of Science and Technology (KAIST), Daejeon, 34141 Korea

These authors contributed equally to this work.

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Hyekyoung Choi

Hyekyoung Choi

Nanomechanical Systems Research Division, Korea Institute of Machinery and Materials, Daejeon, 34103 Korea

Department of Nanomechatronics, Korea University of Science and Technology (UST), Daejeon, 34113 Korea

These authors contributed equally to this work.

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Dr. Sudarsan Tamang

Dr. Sudarsan Tamang

Nanomechanical Systems Research Division, Korea Institute of Machinery and Materials, Daejeon, 34103 Korea

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Jae-Hyeon Ko

Jae-Hyeon Ko

Graduate School of Nanoscience and Technology, Korea Advanced Institute of Science and Technology (KAIST), Daejeon, 34141 Korea

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Sungwoo Kim

Sungwoo Kim

Nanomechanical Systems Research Division, Korea Institute of Machinery and Materials, Daejeon, 34103 Korea

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Prof. Yong-Hyun Kim

Corresponding Author

Prof. Yong-Hyun Kim

Graduate School of Nanoscience and Technology, Korea Advanced Institute of Science and Technology (KAIST), Daejeon, 34141 Korea

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Prof. Sohee Jeong

Corresponding Author

Prof. Sohee Jeong

Nanomechanical Systems Research Division, Korea Institute of Machinery and Materials, Daejeon, 34103 Korea

Department of Nanomechatronics, Korea University of Science and Technology (UST), Daejeon, 34113 Korea

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First published: 05 February 2016
Citations: 23

Abstract

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 (2×2) 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.

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