Patent ID: 7892454

Claim:
A field effect transistor device comprising a thin film semiconductor comprising a compound having the formula: wherein: R a is a straight chain C 1-10 alkyl group, a branched chain C 1-10 alkyl group, a straight chain C 1-10 haloalkyl group, a branched chain C 1-10 haloalkyl group, a straight chain C 2-10 alkenyl group, a branched chain C 2-10 alkenyl group, a C 3-10 cycloalkyl group, a C 6-14 aryl group, or a —C 1-6 alkyl-C 6-14 aryl group, wherein the C 6-14 aryl group is optionally substituted with 1-5 halogen groups; R 9 and R 10 independently are CH or CR g ; R g , at each occurrence, independently is Br, F, CN, or CF 3 ; q and q′ independently are 0, 1, or 2; provided that the total number of R g groups is 1 to 6; and wherein the field effect transistor device exhibits an on/off ratio of at least about 10 5 , and a field effect electron mobility greater than about 0.001 cm 2 /Vs.