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A conjugated polymer pn junction.

Calvin H W Cheng1, Mark C Lonergan

  • 1Department of Chemistry, The Materials Science Institute, Oregon Nanoscience and Microtechnologies Institute, University of Oregon, Eugene, Oregon 97403, USA.

Journal of the American Chemical Society
|August 26, 2004
PubMed
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Researchers created a stable polyacetylene pn homojunction using internal compensation. This method covalently binds dopant counterions, overcoming decades of challenges in creating such conjugated polymer interfaces.

Area of Science:

  • Materials Science
  • Polymer Chemistry
  • Organic Electronics

Background:

  • Dopant counterion diffusion hinders the creation of stable conjugated polymer pn homojunctions.
  • Achieving metastable interfaces between dissimilarly doped conjugated polymers remains a significant challenge.

Purpose of the Study:

  • To report the electrochemical fabrication of a polyacetylene pn homojunction.
  • To demonstrate the utility of internal compensation for creating stable conjugated polymer pn homojunctions.

Main Methods:

  • Electrochemical fabrication of a polyacetylene pn homojunction.
  • Utilizing internally compensated polymers where dopant counterions are covalently bound to the polymer backbone.
  • Drying the fabricated junction under vacuum.

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Main Results:

  • The fabricated pn junction exhibits diode behavior.
  • A forward to reverse current ratio of 7 at 2 V was observed.
  • The study demonstrates the successful application of internal compensation for creating metastable interfaces.

Conclusions:

  • Internal compensation is a viable strategy for fabricating stable conjugated polymer pn homojunctions.
  • This approach overcomes the limitations posed by dopant counterion diffusion.
  • The developed method enables the creation of metastable interfaces essential for advanced electronic devices.