Polymer bilayer films with semi-interpenetrating semiconducting/insulating microstructure for field-effect transistor applications

Fu Chiao Wu, Horng Long Cheng, Yu Ta Chen, Ming Feng Jang, Wei Yang Chou

Research output: Contribution to journalArticlepeer-review

12 Citations (Scopus)

Abstract

We report an unexpected improvement in the microstructural and electrical properties of regioregular poly(3-hexylthiophene) (P3HT) as an active layer in field-effect transistors (FETs) by introducing soft insulating chains from poly(methyl methacrylate) (PMMA) as a cover layer in a solvent mode-dependent manner. A joint experimental and theoretical spectroscopic and electrical analysis is provided to study the P3HT/PMMA bilayer films with semi-interpenetrating semiconducting/insulating interlocked interdiffusion microstructures. Absorption and Raman studies reveal that disordered P3HT chains in films cast from a low-boiling point (bp) solvent favor reorganization into more ordered structures during PMMA covering, thus enhancing the electrical and switch behaviors of FETs. Although high-bp solvents initially create highly crystalline P3HT films, the films are significantly destroyed after the deposition of the PMMA layer, thus dramatically degrading FET characteristics. The semi-interpenetrating semiconducting/insulating microstructures in the designed bilayer films indicate the possibility of ameliorating field-effects in polymer FETs, especially in subthreshold swing and switch on-off behaviors.

Original languageEnglish
Pages (from-to)11103-11110
Number of pages8
JournalSoft Matter
Volume7
Issue number23
DOIs
Publication statusPublished - 2011 Nov 7

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Condensed Matter Physics

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