Three-Dimensional Atomic Imaging of Colloidal Core-Shell Nanocrystals

Journal article (2011)

Authors

S Bals External organisation
M Casavola External organisation
M.A. van Huis QN/High Resolution Electron Microscopy
S van Aert DISC - Mechanical, Maritime and Materials Engineering
KJ Batenburg External organisation
G van Tenderloo External organisation
D Vanmaekelbergh External organisation
Research Group
QN/High Resolution Electron Microscopy
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Published Date

2011

Language

English

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Research Group

QN/High Resolution Electron Microscopy

Abstract

Colloidal core-shell semiconductor nanocrystals form an important class of optoelectronic materials, in which the exciton wave functions can be tailored by the atomic configuration of the core, the interfacial layers, and the shell. Here, we provide a trustful 3D characterization at the atomic scale of a freestanding PbSe(core)-CdSe(shell) nanocrystal by combining electron microscopy and discrete tomography. Our results yield unique insights for understanding the process of cation exchange, which is widely employed in the synthesis of core-shell nanocrystals. The study that we present is generally applicable to the broad range of colloidal heteronanocrystals that currently emerge as a new class of materials with technological importance