ORGN 584 |
| Recent developments in heterojunction organic-based solar cell devices have triggered considerable interest in improving the mobility of electrons within the device. They most commonly contain a blend of electron-donating conducting polymer and an electron-accepting fullerene derivative. Close proximity of the electron accepting and donating moieties is necessary for efficient electron transfer to occur, but more importantly, charge separation needs to be promoted by a bicontinuous network of donor and acceptor systems. The tendency for C60 and fullerene derivatives to phase-separate from the polymer usually gives films of poor morphology, which results in charges being trapped in fullerene island with poor photovoltaic efficiencies. A good way to overcome this problem is the use of so-called “double-cable” polymers. Their main advantage is to link the electron donor and acceptor units. However, these polymers tend to be highly insoluble which renders them impractical for use in photovoltaic devices. We will report the synthesis of the first soluble double-cable polymers containing polythiophene and fullerene moieties. Desymmetrization of the fullerene unit was found to be the key in improving solubility of the polymer and was achieved by Bingel addition of various malonic esters to the fullerene core.
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Heterocycles, Aromatics, Metal-Mediated Reactions and Syntheses, Materials, Devices, and Switches
8:00 PM-10:00 PM, Wednesday, 29 March 2006 Georgia World Congress Center -- Ex. Hall B4, Poster
Sci-Mix
Division of Organic Chemistry |
