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

An organic semiconductor polymer comprising a structural unit represented by Chemical Formula 1:

• wherein in Chemical Formula 1,
• R1, R2, R3, and R4 are each independently a substituted or unsubstituted C1 to C30 alkyl group,
• R5, R6, R7, and R8 are each independently 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, or a combination thereof,
• X1, X2, X3, and X4 are each independently S, Se, or Te,
• a1 and a2 are each independently an integer from 1 to 5,
• a3 is an integer from 0 to 5,
• b1 is 0 or 1,
• n is an integer from 2 to 5,
• p and q are each independently an integer from 1 to 20, and
• r and s are each independently an integer from 1 to 20.