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Hot electron and hole dynamics in quantum dots revealed by 2D spectroscopy

Overview

Colloidal quantum dots (QDs) have attracted interest as materials for opto-electronic applications, wherein their efficient energy use requires the understanding of carrier relaxation. In QDs capped by bifunctional thiols, used to attach the QDs to a surface, the relaxation is complicated by carrier traps.

Using 2D spectroscopy at 77 K, we followed excitations in thiol-capped CdSe QDs and identified the lowest state as an optically allowed hole trap as well as determined an electron trap with excited-state absorption. The presence of traps changes the initial dynamics entirely by offering a different relaxation channel. 2D electronic spectroscopy enabled us to pinpoint correlations between states and to separate relaxation from different starting states.

Groups Involved

Research publications

Collaborators

  • Department of Chemistry, Qena Faculty of Science, South Valley University, Egypt
  • Gas Processing Center, College of Engineering, Qatar University, Qatar
  • Regional Centre for Special Optics and Optoelectronic Systems (TOPTEC), Institute of Plasma Physics, Academy of Sciences of the Czech Republic, Czech Republic