Semiconducting polymers

Conjugated polymer comprising one or more identical or different repeating units of formula I

• wherein the asterisks indicate a link to neighboring groups,
• Ar1 is on each occurrence identically or differently a group selected from the following formulae
• Ar2 is on each occurrence identically or differently a group selected from the following formulae
• wherein ** indicates the position of attachment to the thienothiophene ring,
• W is S, Se or O,
• V is CH or N,
• X1 and X2 are, on each occurrence identically or differently, and independently of each other, O, S or Se
• X is H or F,
• R on each occurrence identically or differently, denotes F, Cl, Br, I, CN, or straight-chain, branched or cyclic alkyl with 1 to 35 C atoms, in which one or more non-adjacent C atoms are optionally replaced by —O—, —S—, —CO—, —CO—O—, —O—CO—, —O—CO—O—, —CR0═CR00— or —C≡C— and in which one or more H atoms are optionally replaced by F, Cl, Br, I or CN, or denotes aryl, heteroaryl, aryloxy, heteroaryloxy, arylcarbonyl, heteroarylcarbonyl, arylcarbonyloxy, heteroarylcarbonyloxy, aryloxycarbonyl or heteroaryloxycarbonyl having 4 to 30 ring atoms that is unsubstituted or substituted by one or more non-aromatic groups R1,
• R0 and R00 are independently of each other H or optionally substituted carbyl or hydrocarbyl optionally comprising one or more hetero atoms,
• R1 is on each occurrence identically or differently 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, optionally substituted silyl, carbyl or hydrocarbyl with 1 to 40 C atoms that is optionally substituted and optionally comprises one or more hetero atoms, or P-Sp-,
• R2 and R3 on each occurrence identically or differently, and independently of each other, are selected from straight-chain alkyl, alkoxy and thioalkyl with 1 to 20 C atoms, or are selected from branched alkyl, alkoxy and thioalkyl with 3 to 20 C atoms, wherein in all the aforementioned groups one or more H atoms are optionally replaced by F, or are selected from aryloxy, heteroaryl or heteroaryloxy that is optionally alkylated or alkoxylated and has 4 to 30 ring atoms,
• R4 has on each occurrence identically or differently one of the meanings given for R or R1,
• P is a polymerisable or crosslinkable group,
• Sp is a spacer group or a single bond,
• X0 is halogen.