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

摘要

Polymers which can be used in p-type materials for organic electronic devices and photovoltaic cells. Compounds, monomers, dimers, trimers, and polymers comprising:;
Good photovoltaic efficiency and lifetime can be achieved. The R group can provide solubility, environmental stability, and fine tuning of spectroscopic and/or electronic properties. Different polymer microstructures can be prepared which encourage multiple band gaps and broad and strong absorptions. The carbonyl can interact with adjacent thiophene rings to provide backbone with rigidity, induce planarity, and reduce and/or eliminate intramolecular chain twisting defects. Polymers comprising benzodithiophene and/or benzothiadiazole structures can show particularly high performance.

主权项

1. 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.