Exciton Dynamics in InSb Colloidal Quantum Dots

SILLS, Andrew, HARRISON, Paul and CALIFANO, Marco (2016). Exciton Dynamics in InSb Colloidal Quantum Dots. The Journal of Physical Chemistry Letters, 7 (1), 31-35.

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Official URL: http://pubs.acs.org/doi/abs/10.1021/acs.jpclett.5b...
Link to published version:: 10.1021/acs.jpclett.5b02408


Extraordinarily fast biexciton decay times and unexpectedly large optical gaps are two striking features observed in InSb colloidal quantum dots that have remained so far unexplained. The former, should its origin be identified as an Auger recombination process, would have important implications regarding carrier multiplication efficiency, suggesting these nanostructures as potentially ideal active materials in photovoltaic devices. The latter could offer new insights into the factors that influence the electronic structure and consequently the optical properties of systems with reduced dimensionality and provide additional means to fine-tune them. Using the state-of-the-art atomistic semiempirical pseudopotential method we unveil the surprising origins of these features and show that a comprehensive explanation for these properties requires delving deep into the atomistic detail of these nanostructures and is, therefore, outside the reach of less sophisticated, albeit more popular, theoretical approaches.

Item Type: Article
Research Institute, Centre or Group: Materials and Engineering Research Institute > Thin Films Research Centre
Identification Number: 10.1021/acs.jpclett.5b02408
Depositing User: Paul Harrison
Date Deposited: 16 Mar 2016 16:36
Last Modified: 20 Oct 2016 21:30
URI: http://shura.shu.ac.uk/id/eprint/11830

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