Voltage-Induced Infrared Spectra from Polymer Field-Effect Transistors

Yukio Furukawa*, Jun Yamamoto, Don Chan Cho, Tatsuo Mori

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

22 Citations (Scopus)


Charge-induced infrared absorption spectra from the metal-insulator-semiconductor diodes fabricated with aluminum oxide, poly(p-xylylene), and SiO2 as gate dielectric and regioregular poly(3-octylthiophene) as organic semiconductor have been measured in situ with reflection or transmission configurations by the FT-IR difference-spectrum method. The observed bands have been attributed to the carriers injected into the polymer layers under the application of minus gate bias. The wavenumber of the band around 1300 cm-1 depends on the gate voltage, indicating that the structure of the carriers depends on the carrier concentration. There exist upper limits in the concentrations of the injected carriers. In situ infrared absorption measurements provide the information about the injected carriers, which affect the properties and the functions of polymer field-effect devices.

Original languageEnglish
Pages (from-to)9-18
Number of pages10
JournalMacromolecular Symposia
Publication statusPublished - 2004 Jan


  • Conjugated polymers
  • Field-effect transistors
  • Infrared spectroscopy
  • Metal-insulator-semiconductor diodes

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Organic Chemistry
  • Polymers and Plastics
  • Materials Chemistry


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