Crystalline organic semiconducting thin films cast from a novel thermolytic thiophene oligomer

Paul C. Chang*, Amanda R. Murphy, Josephine B. Lee, Jean Frechet, Vivek Subramanian

*Corresponding author for this work

Research output: Contribution to journalConference articlepeer-review

Abstract

Here we report on OTFTs made from a novel thermoresponsive thiophene based oligomer. The functionalized oligomer is soluble in common solvents, but loses its solubility upon thermolysis. Devices with channel lengths from 5 to 40 μm were fabricated from solution then subjected to thermolysis at temperatures ranging from 150-250°C. The initially amorphous materials reorganize into highly crystalline films upon thermolysis. Crystallinity was characterized by x-ray diffractometry and atomic force imaging. AFM studies depicted the nucleation of molecular terraces, where the formation and overall height of terraces was observed to be dependent upon the thermolysis temperature and solvent choice. These factors correlated to overall performance. For both dip-cast and spin-cast samples, devices were fabricated at a process temperature of 180°C with mobilities of 0.07 cm 2/Vs and on/off ratios > 10 5. The devices were relatively stable in both air and common solvents, with their mobility degrading only by ∼25% upon immersion in the original casting solvents. The solubility characteristics and process temperatures for these devices may be particularly suitable for solution processing on flexible substrates.

Original languageEnglish (US)
Pages (from-to)337-342
Number of pages6
JournalMaterials Research Society Symposium Proceedings
Volume814
StatePublished - Dec 1 2004
EventFlexible Electronics 2004 - Materials and Device Technology - San Francisco, CA, United States
Duration: Apr 13 2004Apr 16 2004

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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