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Experimental Methods for Trapping Ions Using Microfabricated Surface Ion Traps
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Exciton trapping with a twist.

Chinju Govind1, Israa Shioukhi2, Yinon Deree2

  • 1Department of Physical Chemistry, University of Geneva 30 Quai Ernest-Ansermet CH-1211 Geneva 4 Switzerland eric.vauthey@unige.ch.

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|December 22, 2025
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Summary
This summary is machine-generated.

Twisting the aromatic core of donor-acceptor molecules enhances triplet yield and exciton trapping. This distortion controls electronic excitation localization in conjugated systems by reducing interbranch coupling.

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Area of Science:

  • Photochemistry
  • Organic Electronics
  • Materials Science

Background:

  • Donor-acceptor (D-A) molecules are crucial in optoelectronics.
  • The performance of D-A molecules is sensitive to subunit orientation.
  • The impact of aromatic core curvature on D-A molecule excited states is under-explored.

Purpose of the Study:

  • To investigate the effect of aromatic core twisting in a symmetric double-branched D-π-A molecule.
  • To understand how molecular distortion influences excited-state properties and dynamics.
  • To explore distortion as a method for controlling electronic excitation localization.

Main Methods:

  • Computational modeling of a symmetric double-branched D-π-A molecule.
  • Analysis of excited-state properties, including chiroptical response and triplet yield.
  • Investigation of excited-state symmetry breaking (ESSB) and exciton dynamics.

Main Results:

  • Molecular twisting increases triplet yield and enhances excited-state symmetry breaking (ESSB).
  • Distortion decreases interbranch coupling, facilitating exciton trapping on a single D-π-A branch.
  • Exciton trapping occurs in less polar solvents due to reduced solvation energy requirements post-ESSB.

Conclusions:

  • Aromatic core distortion is a viable strategy for tuning excited-state behavior in D-A systems.
  • Twisting enables control over electronic excitation localization and exciton dynamics.
  • This provides a new design principle for advanced conjugated materials.