Patent ID: 7847284

Claim:
An organic semiconductor device comprising a substrate, a gate electrode, a gate insulating layer, an organic semiconductor layer, a drain electrode, and a source electrode, said organic semiconductor layer being formed of the organic semiconductor material wherein the organic semiconductor material comprises a polymeric compound and a monomeric compound, said polymeric compound having a side chain comprising a core structure a core structure comprising a π electron ring selected from a group consisting of L 6π electron rings, M 8π electron rings, N 10π electron rings, O 12π electron rings, P 14π electron rings, Q 16π electron rings, R 18π electron rings, S 20π electron rings, T 22π electron rings, U 24π electron rings, and V 26π electron rings, wherein L, M, N, O, P, Q, R, S, T, U, and V are each an integer of 0 (zero) to 6 and L+M+N+O+P+Q+R+S+T+U+V=1 to 6, said monomeric compound having the core structure and at least one of a first terminal group in one end of the core structure and a second terminal group in an other end of the core structure being capable of developing liquid crystallinity, wherein the molar ratio of the monomeric compound to the polymeric compound is 1:1 to 1:100, the core structure is selected from the group consisting of structures represented by the following formula: wherein R 3 ′s which may be the same or different, represent a trifluoromethyl group, an alkyl group, a nitro group, a halogen atom, or a hydrogen atom; X represents CH or N; and Y represents S or O, the first terminal group in the one end of the core structure is a hydrogen atom, a halogen atom, a cyano group, a nitro group or a hydroxyl group, the second terminal group in the other end of the core structure is a substituted or unsubstituted alkyl group, a substituted or unsubstituted alkylthio group, a substituted or unsubstituted alkoxyl group, a substitute or unsubstituted alkoxycarbonyl group, or a substituted or unsubstituted alkylcarbonyl group, and the organic semiconductor material is anisotropically oriented in such a direction that, in the core structure, the direction of the overlap of electron orbits is coincident with a charge transport direction.