Conjugated Polymer selected of formula II wherein A is on each occurrence identically or differently a repeating unit of formula I. wherein X 1 and X 3 denote S, and X 2 and X 4 denote CH, R on each occurrence identically or differently denotes 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-, -CR 0 =CR 00 - 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 2 to 40 C atoms that is unsubstituted or substituted by one or more non-aromatic groups R 1, R 0 and R 00 are independently of each other H or optionally substituted carbyl or hydrocarbyl optionally comprising one or more hetero atoms, R 1 is on each occurrence identically or differently H, halogen, -CN, -NC, -NCO, -NCS, -OCN, -SCN, - C(=O)NR 0 R 00 -C(=O)X 0, -C(=O)R 0, -NH 2, -NR 0 R 00, -SH. -SR 0, -SO 3 H, -SO 2 R 0, -OH, -NO 2, -CF 3, -SF 5, 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-, P is a polymerisable group, Sp is a spacer group or a single bond, X 0 is halogen, Ar is on each occurrence identically or differently optionally substituted aryl or heteroaryl, Y 1 and Y 2 are independently of each other H, F, Cl or CN, m is on each occurrence identically or differently 1, 2 or 3, x is on each occurrence identically or differently 0 or 1, wherein in at least one sub-unit ((Ar) y - x is 1. y is on each occurrence identically or differently 0 or 1, n is an integer > 1. A is on each occurrence identically or differently a repeating unit of formula I. R on each occurrence identically or differently denotes 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-, -CR 0 =CR 00 - 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 2 to 40 C atoms that is unsubstituted or substituted by one or more non-aromatic groups R 1, R 0 and R 00 are independently of each other H or optionally substituted carbyl or hydrocarbyl optionally comprising one or more hetero atoms, R 1 is on each occurrence identically or differently H, halogen, -CN, -NC, -NCO, -NCS, -OCN, -SCN, - C(=O)NR 0 R 00 -C(=O)X 0, -C(=O)R 0, -NH 2, -NR 0 R 00, -SH. -SR 0, -SO 3 H, -SO 2 R 0, -OH, -NO 2, -CF 3, -SF 5, 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-, P is a polymerisable group, Sp is a spacer group or a single bond, X 0 is halogen, Ar is on each occurrence identically or differently optionally substituted aryl or heteroaryl, Y 1 and Y 2 are independently of each other H, F, Cl or CN, m is on each occurrence identically or differently 1, 2 or 3, x is on each occurrence identically or differently 0 or 1, wherein in at least one sub-unit ((Ar) y - x is 1. y is on each occurrence identically or differently 0 or 1, n is an integer > 1.