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US 8,894,887 B2Granted
Organic photovoltaic devices comprising fullerenes and derivatives thereof
AssigneesSolvay USA Inc., Nano-C, Inc.
InventorsDarin W. Laird, Reza Stegamat, Henning Richter, Victor Vejins, Lawrence T. Scott, Thomas A. Lada, II
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Abstract
Photovoltaic cells comprising an active layer comprising, as p-type material, conjugated polymers such as polythiophene and regioregular polythiophene, and as n-type material at least one fullerene derivative. The fullerene derivative can be C60, C70, or C84. The fullerene also can be functionalized with indene groups. Improved efficiency can be achieved.
Claims15
A composition adapted for a photovoltaic device comprising a mixture comprising:
- (I) at least one p-type material, wherein the p-type material comprises a conjugated polymer, and (ii) at least one n-type material, wherein the n-type material comprises a fullerene derivative represented by:
- F*—(R)n
- and solvates, salts, and mixtures thereof, wherein n is at least one, F* comprises a fullerene having a surface which comprises six-membered and five-membered rings;
- R comprises an optionally substituted indene;
- and wherein R is covalently bonded to the fullerene by two bonds and wherein the fullerene comprises a C60 fullerene.
2 more elements
Dependencies are inferred from the claim text.