Patent ID: 7365359

Claim:
An organic semiconductor element comprising a functional layer comprising an aligned organic semiconductor material wherein the organic semiconductor material has rodlike low-molecular smectic liquid crystallinity, and comprises a skeleton structure comprising: L 6π electron aromatic rings, M 10π electron aromatic rings, and N 14π electron aromatic rings, wherein L, M, and N are each an integer of 0 (zero) to 4 and L+M+N=1 to 4; and a terminal structure attached to both ends of said skeleton structure, said terminal structure developing smectic liquid crystallinity, the charge mobility of said organic semiconductor material is not less than 5×10 −3 cm 2 V −1 s −1 when in a crystalline phase and not less than 5×10 −2 cm 2 V −1 s −1 when in a liquid crystal phase, and the phase angle θ of impedance of said organic semiconductor material is −80°≦θ≦−90° as determined in the measurement of impedance in a frequency f range of 100 Hz≦f≦1 MHz when said organic semiconductor material in an isotropic phase state is held between a pair of opposed substrates with an interelectrode spacing of 9 μm, wherein the functional layer has been formed by heating said organic semiconductor material to a temperature high enough for the organic semiconductor material to exhibit at least a smectic phase and then cooling the organic semiconductor material, and at least a part of the organic semiconductor material is in an aligned crystal phase.