| 主权项 |
1. An optoelectronic device comprising a first electrode, a second electrode, and a photoactive layer disposed between the first and second electrodes, the photoactive layer comprising a polymer-polymer blend semiconductor material, the polymer-polymer blend semiconductor material comprising an electron-donor polymer and an electron-acceptor polymer, wherein:
the electron-acceptor polymer is represented by Formula 1 or 2: wherein:π-1 and π-1′ are identical or different and independently are selected from the group consisting of: R1 and R1′ are identical or different and independently are selected from the group consisting of a C1-30 alkyl group, a C2-30 alkenyl group, a C1-30 haloalkyl group, a C6-20 aryl group and a 5-14 membered heteroaryl group, wherein the C6-20 aryl group and the 5-14 membered heteroaryl group optionally are substituted with a C1-30 alkyl group, a C2-30 alkenyl group, or a C1-30 haloalkyl group;Ma and Ma′ are identical or different and independently are a repeat unit comprising one or more conjugated moieties that does not include a rylene diimide;p and q independently are a real number, wherein 0.1≦p≦0.9, 0.1≦q≦0.9, and the sum of p and q is about 1; andn is an integer in the range of 2 to 5,000;provided that at least one of the following is true: (a) π-1′ is different from π-1, (b) R1′ is different from R1, or (c) Ma′ is different from Ma; and the electron-donor polymer has an alternating push-pull structure represented by:
*D-A*,wherein:the donor subunit (D) comprises a benzodithiophene moiety selected from the group consisting of: is selected from the group consisting of: each of which optionally is substituted with 1-2 Rb groups, and Rb, at each occurrence, independently is a C3-40 alkyl group or branched alkyl group; the acceptor subunit (A) comprises an electron-poor conjugated moiety; and either the donor subunit (D) or the acceptor subunit (A) comprises one or more thienyl or thienothienyl groups. |
