Patent ID: 8058457

Claim:
An organic thin film transistor comprising a substrate, a gate electrode, a gate insulating layer, an organic active layer and source-drain electrodes wherein the organic active layer is made of a star-shaped oligothiophene-arylene compound including an oligothiophene having p-type semiconductor characteristics bonded to an arylene having n-type semiconductor characteristics, the oligothiophene positioned in a central moiety of the molecule, represented by Formula 1 below, to form a star shape with the arylene: wherein Ar is selected from groups represented by Formula 2 below: wherein R 1 , R 2 , R 3 , and R 4 are independently hydrogen, hydroxyl, amine group, C 1-20 linear, branched or cyclic alkyl, alkoxy, C 1-20 alkoxyalkyl, alkylamine group, ester group or amide group, wherein Ar 1 is selected from groups represented by Formula 3 below: wherein R 5 , R 6 , R 7 , R 8 , R 9 , R 10 , R 11 , R 12 , R 13 are independently hydrogen, a hydroxyl group, an amine group, a C 1-20 linear, branched or cyclic alkyl group, an alkoxy group, a C 1-20 alkoxyalkyl group, an alkylamine group, an ester group or an amide group, wherein Ar 2 is selected from groups represented by Formula 4 below: wherein R 14 , R 15 , R 16 , R 17 , R 18 , R 19 , R 20 , R 21 , are independently hydrogen, a hydroxyl group, an amine group, a C 1-20 linear, branched or cyclic alkyl group, an alkoxy group, a C 1-20 alkoxyalkyl group, an alkylamine group, an ester group or an amide group, R is hydrogen, a hydroxyl group, an amine group, a C 1-20 linear, branched or cyclic alkyl group, an alkoxy group, a C 1-20 alkoxyalkyl group, an alkylamine group, an ester group or an amide group, n is an integer between 3 and 8, n 1 and n 3 are each independently an integer between 0 and 6, and n 2 is an integer between 2 and 8.