Jump to main content
Jump to site search

Issue 61, 2018
Previous Article Next Article

Self-doped colloidal semiconductor nanocrystals with intraband transitions in steady state

Author affiliations

Abstract

The tunable bandgap energy has been recognized as a prominent feature of the colloidal semiconductor nanocrystal, also called the colloidal quantum dot (CQD). Due to the broken degeneracy caused by the quantum confinement effect, the electronic states of the conduction band (CB) are separated by a few hundred meV. The electronic transition occurring in the conduction band is called the intraband transition and has been regarded as a fast electron relaxation process that cannot be readily observed under steady state. However, recent progress in the studies of intraband transitions allowed the observation of the mid-IR intraband transition in steady state and ambient condition, providing a pathway to exploit the mid-IR electronic transition for various optoelectronic applications. The observation of the steady state intraband transitions has been possible due to the electron filling of the lowest electronic state (1Se) of the conduction band in the semiconductor nanocrystal. Specifically, the nanocrystals are “self-doped” with electrons through chemical synthesis – that is, without the need of adding heterogeneous impurity or applying an electrical potential. In this feature article, we summarize the recent advances in the study on intraband electronic transitions along with the interesting findings on the magnetic and electronic properties of the self-doped colloidal metal chalcogenide semiconductor nanocrystals. The mid-IR intraband transitions of non-toxic nanocrystals, which exclude the toxic mercury and cadmium constituents, are also highlighted, which hold promise for safer applications utilizing the higher quantum states of nanocrystals.

Graphical abstract: Self-doped colloidal semiconductor nanocrystals with intraband transitions in steady state

Back to tab navigation

Article information


Submitted
27 Mar 2018
Accepted
26 Jun 2018
First published
26 Jun 2018

Chem. Commun., 2018,54, 8435-8445
Article type
Feature Article

Self-doped colloidal semiconductor nanocrystals with intraband transitions in steady state

J. Kim, D. Choi and K. S. Jeong, Chem. Commun., 2018, 54, 8435 DOI: 10.1039/C8CC02488J

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

Search articles by author

Spotlight

Advertisements