TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preparation (claimed): The polymer is prepared by performing aryl-aryl coupling reaction to above monomers with each other, and/or with one or more monomers selected from formula R3-Ar3-R4 or R3-D-R4.    TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Components: The mixture or blend comprises the n-type organic semiconductor compound comprising fullerene or substituted fullerene.    TECHNOLOGY FOCUS - POLYMERS - Preferred Composition: The polymer comprises one or more units of -((Ar1)a-(U')b-(Ar2)c-(Ar3)d)- (II); -((Ar1)a(D)b(Ar2)c(Ar3)d- (III); asterisk-((A)x-(B')y)n-asterisk (IV); or R3-chain-R4 (V). The compound (IV) is of formula asterisk-((Ar1-U'-Ar2) (Ar3)y)n-asterisk (IVa); asterisk-((Ar1-U'-Ar2)x(Ar3-Ar3)y)n-asterisk (IVb); asterisk-((Ar1-U'-Ar2)c(Ar3Ar3 Ar3)y)n-asterisk (IVc); asterisk-((Ar1)a(U')b(Ar2)c(Ar3)d)n-asterisk (IVd); or asterisk-(((Ar1)a(U')b(Ar2)(Ar3)d)x((Ar1)(D')b(Ar2)(Ar3)d)y)n-asterisk (IVe), where above compounds can be alternating or random copolymers. The compound (IV) is of formula (IV1) or (IV2).U'=compound (I);Ar1-Ar3=aryl or heteroaryl that is different from U', preferably has 5-30 ring atoms and is optionally substituted, preferably by one or more groups R1;R1=F, Br, Cl, -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 1-40C atoms that is optionally substituted and optionally comprises one or more hetero atoms, or P'-Sp-;R0, R00=H or optionally substituted 1-40C carbyl or hydrocarbyl;P'=polymerizable or crosslinkable group;Sp=a spacer group or a single bond;X0=halo, preferably F, CI or Br;a-c=0-2;d=0-10;D=aryl or heteroaryl group that is different from U', preferably 1,4-phenylene, pyridine-2,5-diyl, pyrimidine-2,5-diyl, naphthalene-2,6-diyl, thiophene-2, 5-diyl, selenophene-2,5-diyl, thieno(3,2-b)thiophene-2 ,5-diyl, thieno(2,3-b)thiophene-2, 5-diyl, selenopheno(3,2-b)selenophene-2,5-diyl, selenopheno(2,3-b)selenophene-2,5-diyl, selenopheno(3,2-b)thiophene-2,5-diyl, selenopheno(2 ,3-b)thiophene-2,5-diyl, benzo(1 ,2-b:4,5-b')di- thiophene-2 ,6-diyl, 2 ,2'-dithiophene-5,5'-diyl, 2 ,2'-d iselenophene-5, diyl, dithieno(3,2-b:2',3'-d)silole-5,5-diyl, dithieno(3,2-b;2',3'-d)pyrrole- 5,5-diyl, 4H-cyclopenta(2,1-b:3,4-b')dithiophene-2 ,6-diyl, carbazole-2,7-diyl, fluorene-2,7-diyl, indaceno(1 ,2-b:5,6-b')dithiophene-2,7-diyl, benzo(1'',2'':4,5;4'',5'':4',5')bis(silolo(3,2-b:3',2'-b')thiophene)-2,7-diyl, phenanthro(1 ,10,9,8-c,d,e,f,g)carbazole-2,7-diyl, dihydrobenzo(def)carbazole-2,7-diyl, all of which are unsubstituted, or mono or polysubstituted;A=compound (I) or compound (II);B'=unit that is different from A and comprises one or more aryl or heteroaryl groups that are optionally substituted, and is preferably selected from formula (III);x, y=0-1; orx+y=1;n=greater than 1;chain=polymer chain of compound (IV) or compounds (IVa)- (IVe);R3, R4=F, Br, Cl, H, -CH2Cl, -CHO, -CH=CH2, -SiR'R"R", -SnR'R"R", -B'R'R", -B'(OR')(OR"), -B'(OH)2, or P'-Sp-; orAr1, Ar2=one or more of 11 group of compounds e.g. of formula (1) or (2);R=R1; orAr3=1,4-phenylene, pyridine-2,5-diyl, pyrimidine-2,5-diyl, naphthalene-2,6-diyl, thiophene-2, 5-diyl, selenophene-2 ,5-diyl,thieno(3,2-b)thiophene-2,5-diyl, thieno(2 , 3-b)thiophene-2,5-diyl, selenopheno(3,2-b)selenophene-2,5-diyl, selenopheno(2,3-b)selenophene-2,5-diyl, selenopheno(3,2-b)thiophene-2,5-diyl, selenopheno(2,3-b)thiophene-2,5-diyl, benzo(1 ,2-b:4,5-b')d ithiophene-2,6-diyl, 2,2'-dithiophene-5,5'-diyl, 2,2'-diselenophene-5,5'- diyl, dithieno(3,2-b:2',3'-d)silole-5,5-diyl, dithieno(3,2-b;2',3'-d)pyrrole-5,5-diyl, 4H-cyclopenta(2, 1 -b:3,4-b')d ithiophene-2 ,6-diyl, carbazole2,7-diyl, fluorene-2,7-diyl, indaceno(1 ,2-b:5,6-b')dithiophene-2,7-diyl, benzo(1",2":4,5;4",5":4', 5')bis(silolo(3,2-b:3',2'-b')thiophene)-2 ,7-diyl, phenanthro(1,10,9,8-c,d,e,f,g)carbazole-2,7-diyl, dihydrobenzo(def)carbazole-2,7-diyl, benzo(2,1,3)thiadiazole-4,7-diyl, benzo(2,1,3)selenadiazole-4,7-diyl, benzo(2,1,3)oxadiazole-4,7-diyl, 2H-benzotriazole-4,7-diyl, quinoxaline-5, 8-diyl, thieno(3,4-b)pyrazine-2,5-diyl, thieno(3,4-b)thiophene-4,6-d iyl, thieno(2, 1 ,3)thiadiazole-2,5-diyl, 3,6-di-thien-2-yl-pyrrolo(3,4-c)pyrrole-1 ,4-dione, or (1,3)thiazolo(5,4-d)(1 ,3)thiazole-2,5-diyl, all of which are unsubstituted, or mono- or polysubstituted; andR6, R7=R1, where unfused thiophene rings are optionally substituted by one or two 1-20C alkyl, and compound (IV2) denotes random copolymer. Preferred Definitions:    R1, R2=straight-chain, branched or cyclic alkyl with 1-35C atoms, in which one or more non-adjacent C atoms are optionally replaced by -O-, -S-, -C(O)-, - C(O)-O-, -O-C(O)-, -O-C(O)-O-, -CR0=CR00- or -CC- and in which one or more H atoms are optionally replaced by F, Cl, Br, I or CN, or denote aryl, heteroaryl, aryloxy, heteroaryloxy, arylcarbonyl, heteroarylcarbonyl, arylcarbonyloxy, heteroarylcarbonyloxy, aryloxycarbonyl or heteroaryloxycarbonyl, each of which has 4-30 ring atoms and is optionally substituted by one or more non-aromatic groups L; and    L=halo, -CN, -NC, -NCO, -NCS, -OCN, -SCN, - C(=O)N0R00, -C(=O)X0, -C(=O)R0, -NH2, -NR0R00, -SH, -SR0, - SO3H, -SO2R0, -OH, -NO2, -CF3, -SF5, P'-Sp-, or optionally substituted silyl, carbyl or hydrocarbyl with 1-40C atoms that is optionally substituted and optionally comprises one or more hetero atoms, and is preferably alkyl, alkoxy, thiaalkyl, alkylcarbonyl, alkoxycarbonyl or alkoxycarbonyloxy with 1-20 C atoms that is optionally fluorinated.    EXAMPLE - No suitable example given.