Low-Temperature-Processible, Transparent, and Air-Operable n-Channel Fluorinated Phenylethylated Naphthalenetetracarboxylic Diimide Semiconductors Applied to Flexible Transistors

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• 作者：Byung Jun Jung ; Jia Sun ; Taegweon Lee ; Amy Sarjeant ; Howard E. Katz
• 刊名：Chemistry of Materials
• 出版年：2009
• 出版时间：January 13, 2009
• 年：2009
• 卷：21
• 期：1
• 页码：94-101
• 全文大小：459K
• 年卷期：v.21,no.1(January 13, 2009)
• ISSN：1520-5002

文摘

New N,N′-disubstituted-1,4,5,8-naphthalene tetracarboxylic acid diimides (NTCDI) with fluorinated phenylethyl groups were synthesized. In particular, N,N′-bis(2-(pentafluorophenyl)ethyl)-1,4,5,8-naphthalene tetracarboxylic acid diimide (5FPE-NTCDI) showed high electron mobility, more than 0.1 cm²/(V s) in air, even though the film was deposited at room temperature. The correlation of the crystallinity, morphology, and mobility with the substrate temperature during deposition (T_sub) was studied using X-ray diffraction (XRD) and atomic force microscopy (AFM). The films of 5FPE-NTCDI exhibited a “thin film phase”, mixed phase, and crystal bulk phase as T_sub was increased. The mixed phase on an octadecyltrimethoxysilane (OTS)-treated substrate also has high electron mobility due to well connected long fiber-shaped grains. The high mobility at low T_sub has enabled fabrication of flexible transistors on the clear plastic substrate poly(ethylene terephthalate) (PET). The highest mobility for a flexible, transparent transistor was 0.23 cm²/(V s), obtained with low hysteresis.