Patent ID: 8022396

Claim:
A semiconductor device, comprising: a source electrode; a drain electrode; an organic semiconductor layer made of an organic semiconductor material; a gate electrode that applies an electric field to the organic semiconductor layer; a gate insulating layer that insulates the gate electrode from the organic semiconductor layer; and a lower insulating layer, the organic semiconductor layer being located between the gate insulating layer and the lower insulating layer, and the lower insulating layer being composed of a polymer having a fluorene skeleton, the gate insulating layer directly contacting one of the source electrode and the drain electrode, the gate insulating layer covering a side surface of the organic semiconductor layer, the side surface crossing to a direction from the source electrode to the drain electrode, and the polymer being obtained by copolymerizing a first polymerizable monomer, the first polymerizable monomer including the fluorene skeleton, and a second polymerizable monomer, the second polymerizable monomer including at least one of an epoxy group, an oxetane group, an acrylic acid group, and a methacrylic acid group; wherein the first polymerizable monomer has a structure shown in Structural Formula 1, and the second polymerizable monomer has a structure shown in Structural Formula 2 or Structural Formula 3: (wherein R 1 , R 2 , and R 3 in above formulas respectively represent the following: all of R 1 s are same substituents and have a hydrogen atom or a structure shown in any of Formulas 4 to 8; at least two of R 2 s are same substituents and R 2 s have a hydrogen atom or a structure shown in any of Formulas 4 to 8; and at least three of R 3 s are same substituents and R 3 s have a hydrogen atom or a structure shown in any of Formulas 4 to 8):