Issue 41, 2019

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

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

Supplementary files

Article information

Article type
Paper
Submitted
18 Jul 2019
Accepted
19 Sep 2019
First published
19 Sep 2019

Nanoscale, 2019,11, 19529-19535

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, 11, 19529 DOI: 10.1039/C9NR06110J

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