Semiconducting compounds and optoelectronic devices incorporating same

A compound represented by formula I:

• wherein:
• Ar is an optionally substituted C6-20 aryl group or an optionally substituted 5-20 membered heteroaryl group;
• Ar′ is an optionally substituted C6-20 aryl group or an optionally substituted 5-20 membered heteroaryl group;
• R1 and R2, at each occurrence, independently are selected from the group consisting of a halogen, —CN, and -L-R, wherein L, at each occurrence, is selected from —O—, —S—, —Se—, —C(O)—, —OC(O)—, —C(O)O—, and a covalent bond;
• and R, at each occurrence, independently is selected from the group consisting of a C1-40 alkyl group, a C2-40 alkenyl group, a C2-40 alkynyl group, and a C1-40 haloalkyl group;
• X is selected from the group consisting of —O—, —S—, and —Se—;
• X′ is —CR3, wherein R3 is selected from the group consisting of H, a halogen, —CN, and -L′-R′, wherein L′ is selected from the group consisting of —O—, —S—, —Se—, —C(O)—, —OC(O)—, —C(O)O—, and a covalent bond;
• and R′ is selected from the group consisting of a C1-40 alkyl group, a C2-40 alkenyl group, a C2-40 alkynyl group, and a C1-40 haloalkyl group;
• Y and Y′, independently, are CH or N;
• m is 0, 1, 2, 3, 4 or 5;
• n is 0, 1, 2, 3 or 4;
• and
• p is 0 or 1.