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Surface Energy Modification of Semi-Random P3HTT-DPP.

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Side chains on conjugated polymers like poly(3-hexylthiophene-thiophene-diketopyrrolopyrrole) (P3HTT-DPP) can tune material properties. Oligo-ether chains enhanced crystallinity, while semifluoro chains reduced it, impacting device performance.

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Area of Science:

  • Materials Science
  • Polymer Chemistry
  • Organic Electronics

Background:

  • Conjugated polymers are crucial for organic electronics.
  • Alkyl side chains on polymers influence their properties.
  • Tuning surface energy without altering optical/electronic properties is desirable.

Purpose of the Study:

  • To investigate the effect of oligo-ether and semifluoro alkyl side chains on semi-random poly(3-hexylthiophene-thiophene-diketopyrrolopyrrole) (P3HTT-DPP).
  • To characterize the impact of these side chains on polymer device, optical, electronic, structural, and thermal properties.

Main Methods:

  • Synthesis of P3HTT-DPP polymers with oligo-ether (P3HTMETT-DPP) and semifluoro alkyl (P3HTFHTT-DPP) side chains.
  • Characterization of optical, electronic, structural (crystallinity, lamellar packing), and thermal properties.
  • Fabrication and testing of polymer devices under identical processing conditions.

Main Results:

  • P3HTMETT-DPP showed higher crystallinity, closer lamellar packing, and lower thermal transition temperatures.
  • P3HTFHTT-DPP exhibited reduced crystallinity, larger lamellar packing distances, and higher thermal transition temperatures.
  • P3HTMETT-DPP devices performed similarly to the base P3HTT-DPP, while P3HTFHTT-DPP devices had reduced short-circuit current (JSC) due to solubility issues.

Conclusions:

  • Side chain engineering of P3HTT-DPP significantly alters structural and thermal properties.
  • Oligo-ether side chains promote crystallinity and maintain device performance.
  • Semifluoro alkyl side chains decrease crystallinity and negatively impact device performance due to solubility limitations.