Change search
ReferencesLink to record
Permanent link

Direct link
Impact Ionization and Auger Recombination Rates in Semiconductor Quantum Dots
KTH, School of Biotechnology (BIO), Theoretical Chemistry.ORCID iD: 0000-0002-2442-1809
Show others and affiliations
2010 (English)In: The Journal of Physical Chemistry C, ISSN 1932-7447, E-ISSN 1932-7455, Vol. 114, no 9, 3743-3747 p.Article in journal (Refereed) Published
Abstract [en]

Impact ionization and Auger recombination in nanoscale spherical quantum dots (QDs) have been Studied theoretically. It is shown that due to the strong quantum confinement of both electrons in the conduction band and holes ill the valence band. impact ionization and Auger recombination energies in these QDs call be oil the order of a few millielectronvolts when various selection rules are fulfilled, which are Much higher than spontaneous radiative emission energies. This explains the experimentally reported high Occurrence rates of the multiple exciton generation (MEG) effect in QDs. However, due to quantum confinement, the energy States are discrete in QDs, especially for low-energy states where the densities of states are low. This implies that only a limited number of high-energy electron states call interact with (i.e., impact ionize) low-energy hole states in QDs having certain values of radii due to the energy conservation requirement. This explains the vastly scattered experimental data and difficulties ill Utilizing the MEG effect in practice.

Place, publisher, year, edition, pages
2010. Vol. 114, no 9, 3743-3747 p.
Keyword [en]
carrier multiplication, solar-cells, nanocrystals, efficiency, excitons
National Category
Theoretical Chemistry
URN: urn:nbn:se:kth:diva-19268DOI: 10.1021/jp9082486ISI: 000275045600004ScopusID: 2-s2.0-77949279996OAI: diva2:337315
QC 20100525Available from: 2010-08-05 Created: 2010-08-05 Last updated: 2011-01-21Bibliographically approved

Open Access in DiVA

No full text

Other links

Publisher's full textScopus

Search in DiVA

By author/editor
Fu, YingÅgren, Hans
By organisation
Theoretical Chemistry
In the same journal
The Journal of Physical Chemistry C
Theoretical Chemistry

Search outside of DiVA

GoogleGoogle Scholar
The number of downloads is the sum of all downloads of full texts. It may include eg previous versions that are now no longer available

Altmetric score

Total: 24 hits
ReferencesLink to record
Permanent link

Direct link