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Charge transfer modulation in charge transfer co-crystals driven by crystal structure morphology.

Federica Solano1, Paolo Inaudi1, Ornella Abollino1

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Summary

This study investigates the electronic properties of Perylene:F4-TCNQ organic co-crystals. Researchers found good agreement between experimental and theoretical band gaps, suggesting potential for electronic applications.

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Area of Science:

  • Materials Science
  • Organic Electronics
  • Solid-State Chemistry

Background:

  • Organic co-crystals offer tunable electronic properties.
  • Charge-transfer complexes are key in organic semiconductors.
  • Perylene:F4-TCNQ (PE:F4) is a donor-acceptor system with potential applications.

Purpose of the Study:

  • To experimentally and theoretically investigate the electronic properties of PE:F4 co-crystals.
  • To determine the band gap and understand charge transport mechanisms.
  • To explore the role of defects and radical species.

Main Methods:

  • Electron Paramagnetic Resonance (EPR) spectroscopy.
  • Solid-state cyclic voltammetry (CV) on single crystals.
  • Density Functional Theory (DFT) calculations (PAW and molecular cluster methods).

Main Results:

  • Solid-state electrochemistry effectively probes macroscopic electronic characteristics.
  • EPR detected spin ½ radicals localized on F4 molecules, potentially indicating defects.
  • Experimental (0.336 eV) and theoretical (0.303 eV) band gaps show good agreement.
  • Differences with optical bandgaps are attributed to excitonic effects.

Conclusions:

  • PE:F4 co-crystals exhibit promising semiconducting properties.
  • Combined experimental and theoretical approaches provide comprehensive electronic characterization.
  • The study highlights the importance of defect analysis in organic electronic materials.