Aromatic compound, organic semiconductor layer and organic thin film transistor

An aromatic compound represented by Formula (1-I) or Formula (1-II) below:

• wherein Ar denotes a monocyclic ring or 2 to 6 fused ring;
• X1 and X2 each independently denote one of the group consisting of an oxygen atom, a sulfur atom, a selenium atom, NR3, or CR4═CR5;
• Y1 and Y2 each independently denote CR6 or a nitrogen atom;
• and
• R1 to R6 each independently denote one of the group consisting of a hydrogen atom, a halogen atom, an alkyl group having 1 to 20 carbon atoms, an alkenyl group having 2 to 20 carbon atoms, an alkynyl group having 2 to 20 carbon atoms, an alkadienyl group having 4 to 22 carbon atoms, an alkadiynyl group having 4 to 22 carbon atoms, an aryl group having 4 to 26 carbon atoms, or a group represented by Formula (2) below;
• and at least one of R1 to R6 is a group represented by Formula (2) below;
• wherein A denotes one of the group consisting of an alkenyl group having 2 to 20 carbon atoms, an alkynyl group having 2 to 20 carbon atoms, or an aryl group having 4 to 26 carbon atoms;
• 1 and n each independently denote 0 or 1;
• m denotes an integer of 1 to 20;
• and
• Z1 and Z2 are the same or different at each occurrence and denote one of the group consisting of a hydrogen atom, a halogen atom, and an alkyl group having 1 to 20 carbon atoms.