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
15 ذو القعدة 1440
Accepted
20 محرم 1441
First published
20 محرم 1441

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

To request permission to reproduce material from this article, please go to the Copyright Clearance Center request page.

If you are an author contributing to an RSC publication, you do not need to request permission provided correct acknowledgement is given.

If you are the author of this article, you do not need to request permission to reproduce figures and diagrams provided correct acknowledgement is given. If you want to reproduce the whole article in a third-party publication (excluding your thesis/dissertation for which permission is not required) please go to the Copyright Clearance Center request page.

Read more about how to correctly acknowledge RSC content.

Social activity

Spotlight

Advertisements