Ultrathin polymer gate buffer layer for air-stable, low-voltage, n-channel organic thin-film transistors

Shinji Tanida, Kei Noda, Hiroshi Kawabata, Kazumi Matsushige

Research output: Contribution to journalArticlepeer-review

10 Citations (Scopus)


An ultrathin poly(methyl methacrylate) (PMMA) buffer layer was developed to improve the performance of n-channel organic thin-film transistors (OTFTs). The 8 nm-thick PMMA film, prepared by spin-coating, provided a very smooth surface and a uniform coverage on SiO2 surface reproducibly, which was confirmed by X-ray reflectivity (XR) measurement. Then, we fabricated N,N'-ditridecyl-3,4,9,10-perylenetetracarboxylic diimide (PTCDI-C13) thin-film transistors with and without this 8 nm-thick PMM2 A insulating layer on SiO2 gate insulators and achieved one-order increase of field-effect mobility (up to 0.11 cm2/(Vs) in a vacuum), one-half decrease of threshold voltage, and reduction of current hysteresis with the PMMA layer2. Only TFTs with the PMMA layer displayed n-channel operation in air and showed field-effect mobility of 0.10 cm2/(Vs). We consider that electrical characteristics of n-channel OTFTs were considerably improved because the ultrathin PMMA film could effectively passivate the SiO2 insulator surface and decrease interfacial electron traps. This result suggests the importance of the ultrathin PMMA layer for controlling the interfacial state at the semiconductor/insulator interface and the device characteristics of OTFTs.

Original languageEnglish
Pages (from-to)528-532
Number of pages5
JournalPolymers for Advanced Technologies
Issue number7
Publication statusPublished - 2010 Jul 1
Externally publishedYes


  • Air stability
  • Electron traps
  • N-channel operation
  • Organic thin-film transistor
  • Polymer gate buffer layer

ASJC Scopus subject areas

  • Polymers and Plastics


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