Organic electronic devices and polymers, including photovoltaic cells and diketone-based polymers

A device comprising:

• at least one cathode;
• at least one anode;
• at least one photovoltaic active layer disposed between the cathode and anode and comprising at least one p-type material and at least one n-type material, wherein the p-type material comprises at least one polymer comprising a donor-acceptor structure, comprising a first acceptor backbone moiety:
• wherein R comprises optionally substituted alkyl, optionally substituted linear alkyl, optionally substituted branched alkyl, optionally substituted aryl, optionally substituted alkylaryl, optionally substituted arylalkyl, optionally substituted alkoxy, or optionally substituted aryloxy, and
• wherein the donor comprises at least one benzodithiophene structure, and the polymer comprises at least one second acceptor other than (I), wherein the second acceptor other than (I) comprises a benzothiadiazole structure, wherein the polymer is represented by:
• wherein the R groups of the benzodithiophene structures are alkyl groups, and wherein the R group of the formula (I) structure is as previously defined, and wherein n is adapted to provide the polymer with a number average molecular weight of at least 10,000, and wherein x and y are adapted to provide the polymer with a molar amount of 55-75% of the first acceptor having the formula (I) structure and a molar amount of 25-45% of the second acceptor having the benzothiadiazole structure relative to the total molar amount of the combined first and second structure.