Patent ID: 8158881
Filing Date: 2012-04-17
Classification: B82Y,H01L,Y02E

Abstract:
1. A system, comprising: first and second electrodes; a recombination layer between the first and second electrodes; a first photoactive layer between the first electrode and the recombination layer, the first photoactive layer consisting of a single layer that comprises a first organic electron donor material and a first organic electron acceptor material; and a second photoactive layer between the second electrode and the recombination layer, the second photoactive layer consisting of a single layer that comprises a second organic electron donor material and a second organic electron acceptor material; wherein at least one of the first and second organic electron donor materials comprises a polysilacyclopentadithiophene copolymer, the recombination layer comprises third, fourth, and fifth layers, the fifth layer is between the third and fourth layers, and the system is configured as a photovoltaic system; and wherein the polysilacyclopentadithiophene copolymer comprises a first comonomer repeat unit and a second comonomer repeat unit different from the first comonomer repeat unit, the first comonomer repeat unit comprises a silacyclopentadithiophene moiety; and the second comonomer repeat unit comprises a benzothiadiazole moiety, a thiadiazoloquinoaline moiety, a cyclopentadithiophene oxide moiety, a benzoisothiazole moiety, a benzothiazole moiety, a thiophene oxide moiety, a thienothiophene moiety, a thienothiophene oxide moiety, a dithienothiophene moiety, a dithienothiophene oxide moiety, a tetrahydroisoindole moiety, a fluorene moiety, a silole moiety, a eyclopentadithiophene moiety, a fluorenone moiety, a thiazole moiety, a selenophene moiety, a thiazolothiazole moiety, a cyclopentadithiazole moiety, a naphthothiadiazole moiety, a thienopyrazine moiety, a silacyclopentadithiophene moiety, an oxazole moiety, an imidazole moiety, a pyrimidine moiety, a benzoxazole moiety, or a benzimidazole moiety.