Prof. K. George Thomas "Efficiency Determinants in Exciton–Biexciton Dynamics of Semiconductor Nanocrystals"

  Abstract

Developing semiconductor systems for light-energy harvesting and optoelectronic applications requires a detailed understanding of exciton and biexciton dynamics. We have recently shown that the exciton-to-biexciton quantum efficiency depends not only on the Auger–Meitner rate constant but also on the exciton/biexciton lifetime. To probe this aspect, we investigated exciton-to-biexciton dynamics and plasmonic coupling by positioning a single CdSe nanoplatelet at precisely controlled distances from Au nanofilms. The dependence of exciton-to-biexciton quantum efficiency was further established through two complementary approaches: (i) by varying the excitation wavelength of CdSe nanoplatelets, and (ii) by metal-ion doping using time-resolved single particle experiments. These aspects will be discussed in the presentation.

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Organizer  Cyriaque Genet