Patent ID: 7425723

Claim:
An organic thin-film transistor having a p-type semiconducting layer, wherein the semiconducting layer comprises a crystalline conjugated polyarylamine having the chemical structure of Formula (I): wherein R 1 through R 5 are independently selected from hydrogen, alkyl having from about 1 to about 30 carbon atoms, aryl having from about 6 to about 40 carbon atoms, heteroaryl having from about 3 to about 40 atoms, alkoxy having from about 1 to about 30 carbon atoms, aryloxy having from about 6 to about 40 carbon atoms, and substituted derivatives thereof; wherein A and B are the same or different independently selected from arylenes having from about 6 to about 20 carbon atoms or heteroarylenes having from about 3 to about 20 carbon atoms; and wherein n is the degree of polymerization; and wherein the polyarylamine has a mobility (μ 0 ) of 10 −4 cm 2 /V·sec or greater.