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Epitaxial growth and defect repair of heterostructured CuInSexS2−x/CdSeS/CdS quantum dots

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Abstract

Heterostructured quantum dots (hetero-QDs) have outstanding optical properties and chemical/photostability, which make them promising building blocks for use in various optoelectronic devices. Here, CuInSexS2−x/CdSeS/CdS hetero-QDs were synthesized through a facile two-step method. Their particle size, three-dimensional (3D) shapes and the epitaxial relationship between the CuInSexS2−x/CdSeS core and CdS shell were investigated by high-resolution transmission electron microscopy (HRTEM). Our investigation proves that the as-synthesized hetero-QDs have a regular tetrahedron 3D shape with four {111} crystal facets. The epitaxial relationship between the CuInSexS2−x/CdSeS core and CdS shell is determined to be [110]core//[110]shell, {112}core//{111}shell. In situ HRTEM observations show that the screw dislocation inside the hetero-QDs can be efficiently repaired using e-beam irradiation. These results may help in designing hetero-QDs with high-quality interfaces and identifying the strategies for synthesizing defect-free hetero-QDs.

Graphical abstract: Epitaxial growth and defect repair of heterostructured CuInSexS2−x/CdSeS/CdS quantum dots

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Publication details

The article was received on 18 Jul 2019, accepted on 19 Sep 2019 and first published on 19 Sep 2019


Article type: Paper
DOI: 10.1039/C9NR06110J
Nanoscale, 2019, Advance Article

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    Epitaxial growth and defect repair of heterostructured CuInSexS2−x/CdSeS/CdS quantum dots

    C. Wang, D. Barba, H. Zhao, X. Tong, Z. Wang and F. Rosei, Nanoscale, 2019, Advance Article , DOI: 10.1039/C9NR06110J

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