NOVELTY - The organic-semiconductor structure has organic-semiconductor layer which consists of orientated liquid crystalline organic-semiconductor material in part at least. The liquid crystalline organic-semiconductor material consists of organic compound with core which contains L 6 pi-electron system ring, M 8 pi-electron system ring, N 10 pi-electron system ring, O 12 pi-electron system ring, P 14 pi-electron system ring, Q 16 pi-electron system ring, R 18 pi-electron system ring, S 20 pi-electron system ring, T 22 pi-electron system ring, U 24 pi-electron system ring and V 26 pi-electron system ring where L, M, N, O, P, Q, R, S, T, U, V = the integer 0-6, and L+M+N+O+P+Q+R+S+T+U+V=1-6. At temperature less than pyrolysis temperature, it has at least 1 type of liquid-crystal state.    USE - Used as an organic transistor, organic electroluminescent element, an organic electronic device, or an organic solar cell (claimed).    ADVANTAGE - An organic semiconductor layer is formed which has a large area, is even and has high charge-transfer characteristics.    DETAILED DESCRIPTION - INDEPENDENT CLAIMS are also included for (1) a method to manufacture the organic-semiconductor structure including the process which makes the liquid crystalline organic-semiconductor material into a liquid-crystal state by going through or maintaining the liquid-crystal temperature of liquid crystalline organic-semiconductor material, and the process which carries out the orientation crystallization of the liquid crystalline organic-semiconductor material by cooling the liquid organic-semiconductor material of a liquid-crystal state; and (2) the organic-semiconductor apparatus which comprises a substrate, a gate electrode, a gate insulating layer, an organic-semiconductor layer, a drain electrode, and a source electrode.    DESCRIPTION OF DRAWING(S) - Figure 3 shows the organic semiconductor device.    Substrate (11)    Gate electrode (12)    Gate insulating layer (13)    Organic semiconductor layer (14)    Drain electrode (15)    Source electrode (16)    Organic semiconductor device (101)