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[摘要]：Organic field-effect transistors based on two derivatives of annelated beta-oligothiophenes are fabricated. High mobility of 2.2 cm(2) V(-1) s(-1) is obtained for 2,5-distyryl-dithieno[2,3-b:3',2'-d]thiophene (DEP-DTT) while 2,5-diphenyl-dithieno[2,3-b:3',2'-d]thiophene (DP-DTT) presents no field-effect characteristics. The existence of S-pi intermolecular interaction in DEP-DTT, which is introduced by C=C double bonds, plays an important role in the molecular arrangement both in single crystal and thin film structures, and the charge transport of organic field-effect transistors. |
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