Patent ID: 7829373

Claim:
A method of forming an organic polymer semiconductor thin film, comprising: applying a solution of an organic polymer semiconductor compound of a polythiophene derivative represented by Formulas 3 or 4 below, to form a coating film; and treating the coating film using heat or light or undergoing a radical reaction such that a removable substituent is removed therefrom, wherein the organic polymer semiconductor compound is converted to an insoluble organic polymer semiconductor thin film that is insoluble in a solvent used in the solution of the organic polymer semiconductor compound: wherein in Formulas 3 and 4, R 2′ is independently a linear or branched alkyl group having from 1 to 30 carbon atoms; an alkoxyalkyl group having from 1 to 30 carbon atoms; an alkyl group, including a siloxy group, having from 1 to 30 carbon atoms; or a perfluoroalkyl group having from 1 to 30 carbon atoms, wherein R 3 and R 4 are independently hydrogen; a linear or branched alkyl group having from 1 to 12 carbon atoms; or an alkoxyalkyl group having from 1 to 12 carbon atoms, wherein m is an integer ranging from 1 to 2, wherein 0≦x≦3 and y=1, wherein x is an integer, and wherein n is an integer ranging from about 10 to about 1,000.