Exciton Dynamics in InSb Colloidal Quantum Dots

Andrew Sills, Paul Harrison, Marco Califano

Research output: Contribution to journalArticlepeer-review

17 Citations (Scopus)

Abstract

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.

Original languageEnglish
Pages (from-to)31-35
Number of pages5
JournalJournal of Physical Chemistry Letters
Volume7
Issue number1
Early online date11 Dec 2015
DOIs
Publication statusPublished - 7 Jan 2016
Externally publishedYes

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