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Molecular iodine doping significantly enhances the conductivity and carrier mobility of two-dimensional conjugated covalent organic frameworks (2D c-COFs). This study reveals doping mitigates scattering mechanisms, paving the way for advanced optoelectronic devices.

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Area of Science:

  • Materials Science
  • Organic Electronics
  • Nanotechnology

Background:

  • Two-dimensional conjugated covalent organic frameworks (2D c-COFs) are promising semiconducting materials for optoelectronics and energy storage.
  • Understanding doping mechanisms is crucial for tuning charge transport properties in 2D c-COFs, but remains largely unexplored.

Purpose of the Study:

  • To investigate the effects of molecular iodine doping on a metal-phthalocyanine-based pyrazine-linked 2D c-COF.
  • To elucidate the mechanism behind enhanced charge transport properties upon doping.

Main Methods:

  • Synthesis of a metal-phthalocyanine-based pyrazine-linked 2D c-COF.
  • Molecular iodine doping of the 2D c-COF.
  • Electrical conductivity measurements.
  • Hall effect measurements to determine carrier concentration and mobility.

Main Results:

  • The iodine-doped 2D c-COF (ZnPc-pz-I) maintained structural integrity.
  • Conductivity was enhanced by three orders of magnitude due to increased carrier concentration.
  • Record carrier mobility of ~22 cm² V⁻¹ s⁻¹ was achieved, attributed to increased scattering time for charge carriers.

Conclusions:

  • Molecular iodine doping is an effective strategy to significantly enhance conductivity and carrier mobility in 2D c-COFs.
  • Doping mitigates scattering mechanisms, leading to improved charge transport.
  • This work provides a framework for assessing doping effects in COFs and highlights their potential for advanced optoelectronic applications.