Core-Expanded Naphthalene Diimides Fused with 2-(1,3-Dithiol-2-Ylidene)Malonitrile Groups for High-Performance, Ambient-Stable, Solution-Processed n-Channel Organic Thin Film Transistors

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• 作者：Xike Gao ; Chong-an Di ; Yunbin Hu ; Xiaodi Yang ; Hongyu Fan ; Feng Zhang ; Yunqi Liu ; Hongxiang Li ; Daoben Zhu
• 刊名：Journal of the American Chemical Society
• 出版年：2010
• 出版时间：March 24, 2010
• 年：2010
• 卷：132
• 期：11
• 页码：3697-3699
• 全文大小：186K
• 年卷期：v.132,no.11(March 24, 2010)
• ISSN：1520-5126

文摘

A new class of n-type semiconductors for organic thin film transistors (OTFTs), based on core-expanded naphthalene diimides fused with 2-(1,3-dithiol-2-ylidene)malonitrile groups, is reported. The first two representatives of these species, derived from long branched N-alkyl chains, have been successfully used as active layers for high-performance, ambient-stable, solution-processed n-channel OTFTs. Their bottom-gate top-contact devices fabricated by spin-coating methods exhibit high electron mobilities of up to 0.51 cm² V⁻¹ s⁻¹ with current on/off ratios of 10⁵−10⁷, and small threshold voltages below 10 V under ambient conditions. As this class of n-type organic semiconductors has relatively low-lying LUMO levels and good film-formation ability, they also displayed good environmental stability even with prolonged exposure to ambient air. Both the device performance and the ambient stability are among the best for n-channel OTFTs reported to date.