Organic semiconductor composition containing cis-decalin

1. An organic semiconductor composition, comprising:

an organic semiconductor material having a structural unit including at least one thiophene ring as a repeating unit; and

an organic solvent including cis-decalin, wherein the organic solvent includes 15 wt % or more cis-decalin.

2. The organic semiconductor composition according to claim 1 , further comprising:

a substance whose second virial coefficient to the organic semiconductor material is smaller than a second virial coefficient of cis-decalin.

3. The organic semiconductor composition according to claim 2 , wherein the substance is trans-decalin.

4. The organic semiconductor composition according to claim 3 , wherein a volume ratio of cis-decalin to trans-decalin in the organic solvent is from 3:7 to 7:3.

5. The organic semiconductor composition according to claim 1 , wherein the structural unit includes a Π conjugated structure on a main chain.

6. The organic semiconductor composition according to claim 5 , wherein the Π conjugated structure is a fluorine ring.

7. The organic semiconductor composition according to claim 6 , wherein the structural unit includes an alkyl chain bound to the fluorine ring.

8. The organic semiconductor composition according to claim 1 , wherein the structural unit includes an alkyl chain.

9. The organic semiconductor composition according to claim 7 , wherein the alkyl chain includes carbon numbers of from 4 to 20.

10. The organic semiconductor composition according to claim 1 , wherein the organic semiconductor material includes numbers of the repeating unit of from 2 to 500 in average.

11. The organic semiconductor composition according to claim 1 , wherein the organic semiconductor composition includes 0.1 wt % to 5 wt % of the organic semiconductor material.