Polymers derived from bis(thienocyclopenta) benzothiadiazole and their use as organic semiconductors

Monomer of formula II

• wherein
• X1 and X2 denote independently of each other S, Se or —CR1=CR2—,
• R1-4 are identical or different groups independently of each other selected from H, halogen, —CN, —NC, —NCO, —NCS, —OCN, —SCN, —C(=O)NR0R00, —C(=O)X0,—C(=O)R0, —NH2, —NR0R00, —SH, —SR0, —SO3H, —SO2R0, —OH, —NO2 —CF3—SF5, P-Sp-, optionally substituted silyl, or carbyl or hydrocarbyl with 1 to 40 C atoms that is optionally substituted and optionally comprises one or more hetero atoms,
• Ar is in each occurrence independently of one another are an optionally substituted aryl or heterorayl group, —CY1=CY2-or —C≡C—,
• m is in each occurrence independently of one another 0, 2, 2, 3 or 4,
• R7 and R8 denote independently of each other halogen, —CH2Cl, —CHO, —CH═CH2 —SiR′R″R′″, —SnR′R″R′″, —BR′R″, —B(OR′)(OR″), —B(OH)2, a leaving group or P-Sp,
• P is a polymerisable group,
• Sp is a spacer group or a single bond, and
• R′, R″ and R′″ are, have independently of each other halogen, H or an optionally substituted carbyl or hydrocarbyl group optionally comprising one or more hetero atoms, and R′ and R″ may also form a ring together with the hetero atom to which the are attached.