Journal
POLYMERS FOR ADVANCED TECHNOLOGIES
Volume 21, Issue 7, Pages 528-532Publisher
WILEY
DOI: 10.1002/pat.1474
Keywords
organic thin-film transistor; polymer gate buffer layer; n-channel operation; air stability; electron traps
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Funding
- Ministry of Education, Culture, Sports, Science, and Technology of Japan
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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'-ditridecy1-3,4,9,10-perylenetetracarboxylic diimide (PTCDI-C13) thin-film transistors with and without this 8 nm-thick PMMA insulating layer on SiO2 gate insulators and achieved one-order increase of field-effect mobility (up to 0.11 cm(2)/(Vs) in a vacuum), one-half decrease of threshold voltage, and reduction of current hysteresis with the PMMA layer. Only TFTs with the PMMA layer displayed n-channel operation in air and showed field-effect mobility of 0.10 cm(2)/(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. Copyright (C) 2009 John Wiley & Sons, Ltd.
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