Frequency response analysis of pentacene thin-film transistors with low impedance contact by interface molecular doping

Tetsuhiko Miyadera, Takeo Minari, Kazuhito Tsukagoshi, Hiromi Ito, Yoshinobu Aoyagi

Research output: Contribution to journalArticlepeer-review

53 Citations (Scopus)

Abstract

Frequency response measurements were performed on top-contact pentacene organic thin-film transistors (OTFTs). The ac characteristics of OTFTs are strongly limited by the contact interface between a metallic electrode and a pentacene thin film. Local doping of a charge transfer molecule (CTM) into the contact interface efficiently improves the ac characteristics. Metal-insulator-semiconductor capacitance measurements revealed that the interface contains parasitic impedance composed of capacitance and resistance in parallel. The parasitic impedance was suppressed by CTM doping of the interface. The limitation factors for the frequency of operation in such an OTFT are discussed based on the experimental results and an equivalent circuit model.

Original languageEnglish
Article number013512
JournalApplied Physics Letters
Volume91
Issue number1
DOIs
Publication statusPublished - 2007
Externally publishedYes

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)

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