Advanced theory of multiple exciton generation effect in quantum dots

B. Oksengendler, N. Turaeva () and S. Rashidova

The European Physical Journal B: Condensed Matter and Complex Systems, 2012, vol. 85, issue 6, 1-5

Abstract: The theoretical aspects of the effect of multiple exciton generation (MEG) in quantum dots (QDs) have been analysed in this work. The statistical theory of MEG in QDs based on Fermi’s approach is presented, taking into account the momentum conservation law. According to Fermi this approach should give the ultimate quantum efficiencies of multiple particle generation. The microscopic mechanism of this effect is based on the theory of electronic “shaking”. According to this approach, the wave function of “shaking” electrons can be selected as Plato’s functions with effective charges depending on the number of generated excitons. From the theory it is known increasing the number of excitons leads to enhancement of the Auger recombination of electrons which results in reduced quantum yields of excitons. The deviation of the averaged multiplicity of the MEG effect from the Poisson law of fluctuations has been investigated on the basis of synergetics approaches. In addition the role of interface electronic states of QDs and ligands has been considered by means of quantum mechanical approaches. The size optimisation of QDs has been performed to maximise the multiplicity of the MEG effect. Copyright EDP Sciences, SIF, Springer-Verlag Berlin Heidelberg 2012

Keywords: Topical issue: From photophysics to optoelectronics of zero- and one-dimensional nanomaterials (search for similar items in EconPapers)
Date: 2012
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DOI: 10.1140/epjb/e2012-20444-5

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