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Exciton-Trion Conversion Dynamics in a Single Molecule. | LitMetric

Exciton-Trion Conversion Dynamics in a Single Molecule.

ACS Nano

Institute of Physics, Czech Academy of Sciences, Cukrovarnická 10/112, CZ16200 Praha 6, Czech Republic.

Published: April 2021

AI Article Synopsis

  • The study focuses on the behavior of trions, which are charged optical excitations, in single molecules, particularly using Zinc Phthalocyanine (ZnPc) on NaCl/Ag(111) substrates.
  • Researchers employ advanced techniques, like phase fluorometry and time-resolved single photon detection, to understand the fast dynamics of excitons and trions at the single molecule level.
  • The findings reveal how the effective lifetimes of these excitations are influenced by bias voltage, and establish a conversion mechanism from neutral excitons to trions, supported by a four-state model.

Article Abstract

Charged optical excitations (trions) generated by charge carrier injection are crucial for emerging optoelectronic technologies as they can be produced and manipulated by electric fields. Trions and neutral excitons can be efficiently induced in single molecules by means of tip-enhanced spectromicroscopic techniques. However, little is known of the exciton-trion dynamics at single molecule level as this requires methods permitting simultaneous subnanometer and subnanosecond characterization. Here, we investigate exciton-trion dynamics by phase fluorometry, combining radio frequency modulated scanning tunnelling luminescence with time-resolved single photon detection. We generate excitons and trions in single Zinc Phthalocyanine (ZnPc) molecules on NaCl/Ag(111), and trace the evolution of the system in the picosecond range. We explore the dependence of effective lifetimes on bias voltage and describe the conversion mechanism from neutral excitons to trions, via charge capture, as the primary pathway to trion formation. We corroborate the dynamics of the system by a causally deterministic four-state model.

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Source
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC7611190PMC
http://dx.doi.org/10.1021/acsnano.1c01318DOI Listing

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