Organic semiconductor polymer, organic thin film transistor, and electronic device

An organic thin film transistor, comprising:

• a gate electrode;
• an organic semiconductor overlapping the gate electrode;
• and
• a source electrode and a drain electrode electrically connected to the organic semiconductor,
• the organic semiconductor including a moiety represented by the following Chemical Formula 1 and a heteroaromatic moiety having at least one of sulfur (S) and selenium (Se):
• wherein, in the Chemical Formula 1,
• each of R1, R2, R3a, R3b, R4a, R4b, R5a, and R5b are independently one of hydrogen, a substituted or unsubstituted C1 to C30 alkyl group, a substituted or unsubstituted C3 to C30 cycloalkyl group, a substituted or unsubstituted C6 to C30 aryl group, a substituted or unsubstituted C7 to C30 arylalkyl group, a substituted or unsubstituted C1 to C30 heteroalkyl group, a substituted or unsubstituted C2 to C30 heterocycloalkyl group, a substituted or unsubstituted C2 to C30 alkenyl group, a substituted or unsubstituted C2 to C30 alkynyl group, a hydroxy group, a halogen atom, and a combination thereof,
• each of a1 and a2 are independently integers ranging from 1 to 5, and
• each of b1 and b2 are independently integers ranging from 1 to 10.