Patent ID: 8598450

Claim:
An optoelectronic device comprising an anode, a cathode optionally one or more anode interlayers, optionally one or more cathode interlayers, and in between the anode and the cathode a photoactive component, the photoactive component comprising a fullerene compound and a random copolymer, wherein the random copolymer is represented by formula (IVa) or (VIIIa): wherein: R a and R b are C 6-40 alkyl groups; R c and R d are C 6-40 alkyl groups identical to or different from R a and R b ; R 5a is a C 6-40 alkyl group; R 5b is H or a C 6-40 alkyl group; R 6a and R 6b are identical or different and independently are selected from —R 5 , —OR 5 , —SR 5 and —Y—R 5 , wherein Y is a divalent C 6-14 aryl group or a divalent 5-14 membered heteroaryl group; and R 5 , at each occurrence, independently is a C 6-40 alkyl group optionally substituted with 1-5 substituents independently selected from a halogen, —CN, —NH 2 , —NH(C 1-20 alkyl), —N(C 1-20 alkyl) 2 , —SiH 3 , —SiH(C 1-20 alkyl) 2 , —SiH 2 (C 1-20 alkyl), —Si(C 1-20 alkyl) 3 , an —O—C 1-20 alkyl group, and an —S—C 1-20 alkyl group; and p, q, s and t are real numbers representing mole fractions, wherein 0.025≦p≦0.975, 0.025≦q≦0.975, 0.025≦s≦0.975, 0.025≦t≦0.975, and the sum of p, q, s, and t is about 1; provided that at least one of the following is true: (a) R c and R d are C 6-40 alkyl groups different from R a and R b , (b) R 5a is a C 6-40 alkyl group and R 5b is H; and (c) R 6a and R 6b are different; and wherein the random copolymer has a molecular weight in the range of about 1,000 to about 500,000.