Organic thin film transistor

Abstract

A thin film transistor comprising at least three terminals consisting of a gate electrode, a source electrode and a drain electrode; an insulator layer and an organic semiconductor layer on a substrate, which controls its electric current flowing between the source and the drain by applying a electric voltage across the gate electrode, wherein the organic semiconductor layer comprises a styryl derivative having a styryl structure expressed by C 6 H 5 —CH═CH—C 6 H 5 , or a distyryl structure expressed by C 6 H 5 —CH═CH—C 6 H 5 —CH═CH—C 6 H 5 each without molecular weight distribution. The transistor has a fast response speed (driving speed), and further, achieves a large On/Off ratio getting an enhanced performance as a transistor.

1 - 16 . (canceled) 
     
     
         17 . A thin film transistor comprising at least three terminals consisting of a gate electrode, a source electrode and a drain electrode; an insulator layer and an organic semiconductor layer on a substrate, which controls its electric current flowing between the source and the drain by applying a electric voltage across the gate electrode, wherein the organic semiconductor layer comprises a styryl compound represented by a following general formula (b): 
       
         
           
           
               
               
           
         
         wherein R 23  to R 27  each independently represents a hydrogen atom, a halogen atom, a cyano group, an alkyl group having 1 to 30 carbon atoms, a haloalkyl group having 1 to 30 carbon atoms, an alkoxyl group having 1 to 30 carbon atoms, a haloalkoxyl group having 1 to 30 carbon atoms, an alkylthio group having 1 to 30 carbon atoms, a haloalkylthio group having 1 to 30 carbon atoms, an alkylamino group having 1 to 30 carbon atoms, a dialkylamino group having 2 to 60 carbon atoms and whose alkyl groups may bond to each other to form a ring structure containing a nitrogen atom, an alkylsulfonyl group having 1 to 30 carbon atoms, or a haloalkylsulfonyl group having 1 to 30 carbon atoms, all of those may have a substituent and 
         p, q and r each represents an integer of 0 to 10; and a sum of p+q+r makes an integer of 0 to 20.