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

Shinji Tanida, Kei Noda, Hiroshi Kawabata, Kazumi Matsushige

研究成果: Article査読

9 被引用数 (Scopus)

抄録

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.

本文言語English
ページ(範囲)528-532
ページ数5
ジャーナルPolymers for Advanced Technologies
21
7
DOI
出版ステータスPublished - 2010 7 1
外部発表はい

ASJC Scopus subject areas

  • ポリマーおよびプラスチック

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