Trialkylsilylethynyl-Functionalized Tetraceno[2,3-b]thiophene and Anthra[2,3-b]thiophene Organic Transistors

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• 作者：Ming L. Tang ; Anna D. Reichardt ; Theo Siegrist ; Stefan C. B. Mannsfeld ; Zhenan Bao
• 刊名：Chemistry of Materials
• 出版年：2008
• 出版时间：July 22, 2008
• 年：2008
• 卷：20
• 期：14
• 页码：4669 - 4676
• 全文大小：2422K
• 年卷期：v.20,no.14(July 22, 2008)
• ISSN：1520-5002

文摘

A series of ethynyl-substituted molecules with the tetraceno[2,3-b]thiophene and anthra[2,3-b]thiophene core have been synthesized. The aim was to investigate the impact of differently bulky side-chain substituents on the packing of the molecule in thin film and hence its thin-film transistor (TFT) mobility. Three R groups were used, namely, the tri-isopropyl-, triethyl-, and trimethylsilylethynyl groups. We did not observe a direct correlation between substituent size and TFT mobility. However, the 5,12-bis(tri-isopropylsilylethynyl)tetraceno[2,3-b]thiophene has a mobility as high as 1.25 cm²/V·s, the 5,12-bis(trimethylsilylethynyl)tetraceno[2,3-b]thiophene has a mobility of about 0.00616 cm²/V·s, while 5,10-bis(triethylsilylethynyl)anthra[2,3-b]thiophene and 5,10-bis(trimethylsilylethynyl)anthra[2,3-b]thiophene have a mobility of 10⁻⁴cm²/V·s on phenylsilane- and octadecyltrichlorosilane-treated surfaces respectively.