The origin of collected charge and open-circuit voltage in blended polyfluorene photovoltaic devices

  • Snaith H
  • Greenham N
  • Friend R
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Encouraging efficiencies for org. photovoltaic devices have been achieved with devices contg. blends of donor and acceptor materials. However, due to the complex microstructure of these systems, the detailed physics detg. device operation is difficult to elucidate. Bilayer devices with distinct layers of donor and acceptor materials are less efficient at exciton dissocn., but are easier to model quant. Layered structures contg. both pristine and blended layers were used here in order to study the transport properties of the blended layers, and hence to det. how the microstructure is related to performance in blended photovoltaic devices. Results for polymer blend films, spin-coated from chloroform solns., are presented. These films have a fine scale of phase sepn. due to the rapid evapn. of the solvent, freezing out the onset of spinodal decompn. It was shown that for a polymer blend device where there is a fine scale of phase sepn., only charges generated close to either electrode can be collected. The OCV of a polymer blend device is lower than that of a bilayer device as a result of direct paths from cathode to anode of each component of the blend. A charge injection barrier from the electrodes into the polymer film helps to retain a high OCV in the blend. [on SciFinder(R)]

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  • Henry J. Snaith

  • Neil C. Greenham

  • Richard H. Friend

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