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Synthesis of Cyclic Polymers and Characterization of Their Diffusive Motion in the Melt State at the Single Molecule Level
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A Nonorthogonal Configuration Interaction Approach to Singlet Fission in Perylenediimide Compounds.

C Sousa1, A Sánchez-Mansilla2, R Broer3

  • 1Departament de Ciència de Materials i Química Física and Institut de Química Teòrica i Computacional, Universitat de Barcelona, 08028 Barcelona, Spain.

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Perylenediimide molecules can boost organic solar cell efficiency through singlet fission. Optimal crystal packing, with specific PDI dimer arrangements, is crucial for efficient singlet fission, influencing electronic couplings and charge transfer states.

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Area of Science:

  • Materials Science
  • Organic Electronics
  • Photochemistry

Background:

  • Perylenediimide (PDI) molecules are chromophores capable of singlet fission.
  • Singlet fission converts one singlet excited state into two triplet excited states, potentially enhancing organic solar cell efficiency.

Purpose of the Study:

  • To investigate how crystal packing affects singlet fission in PDI derivatives.
  • To analyze the impact of PDI molecular arrangements on singlet and triplet state energies and electronic couplings.

Main Methods:

  • Utilized the nonorthogonal configuration interaction method for theoretical calculations.
  • Studied the influence of different crystal packing arrangements on PDI derivatives.

Main Results:

  • Identified specific dimer conformations (large long-axis, short short-axis displacements) as favorable for singlet fission.
  • Revealed the significant role of charge transfer states in the singlet fission mechanism.
  • Found that imide group substituents affect electronic couplings but not energies, potentially causing computational artifacts.

Conclusions:

  • Crystal packing significantly influences singlet fission efficiency in PDI molecules.
  • Specific PDI dimer arrangements are key for optimizing singlet fission.
  • Care must be taken when modeling PDI molecules, as substituents can alter computational results.