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H. J. Snaith, N. C. Greenham and R. H. Friend The Origin of Collected Charge and Open-Circuit Voltage in Blended Polyfluorene Photovoltaic Devices Advanced Materials 16

Version of Record online: 14 OCT 2004 | DOI: 10.1002/adma.200305766

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Polymer blend photovoltaic devices (see Figure) are investigated and the characteristic electron and hole lengths estimated. It is found that for a polymer film exhibiting fine-scale phase separation, only charges generated close to the electrode can be collected. The open-circuit voltage for polymer blend devices is found to be lower than that for bilayer devices, a result of the direct paths from cathode to anode within each blend component.

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