Patent ID: 8691931

Claim:
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 polymer backbone moiety: wherein A 1 and A 2 each independently comprise a fused ring system comprising at least two fused rings directly covalently linked to the substructure of VIII represented as substructure IX: wherein R groups R 1 and R 2 each comprise optionally substituted alkyl, optionally substituted linear alkyl, optionally substituted branched alkyl, optionally substituted cycloalkyl, optionally substituted aryl, optionally substituted alkylaryl, optionally substituted arylalkyl, optionally substituted alkoxy, or optionally substituted aryloxy, and optionally, wherein R groups R 1 and R 2 further comprises fluorine, and wherein the polymer comprises a donor-acceptor structure, and A 1 and A 2 comprise the donor which comprises at least one tricyclic unit comprising three fused rings.