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J. Mater. Chem., 2007, 17, 1421 - 1426, DOI: 10.1039/b616381e

Dibenzothiophene derivatives as new prototype semiconductors for organic field-effect transistors

Jianhua Gao, Liqiang Li, Qing Meng, Rongjin Li, Hui Jiang, Hongxiang Li and Wenping Hu

New prototype semiconductor materials based on dibenzothiophene (DBT) derivatives were successfully synthesized by a convergent approach using palladium catalyzed Stille coupling reactions. Thermogravimetric analysis, UV-vis spectra and electrochemistry results indicated these materials had good thermal and photooxidation stability. X-Ray diffraction measurements of the vacuum-evaporated films showed enhanced crystalline order with increasing substrate deposition temperature. The ordered vacuum-evaporated films with charge carrier mobility as high as 7.7 × 10–2 cm2 V–1 s–1 and an on/off ratio of nearly 1 × 107 had been achieved with 3,7-bis(5-hexyl-thiophen-2-yl)-dibenzothiophene (3,7-DHTDBTT). These results suggest that the 3,7-substituted DBT system is a good prototype for new type organic semiconductors and will play a more important role in organic semiconductors.

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