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Direct measurements of the field‐dependent efficiency with which electron‐hole pairs are dissociated (1) can be combined with direct measurement of the carrier‐density dependent rate at which they subsequently recombine (2) to determine the proportion of carriers which may be usefully extracted (3) for a class of solution‐processed organic small‐molecule bulk‐heterojunction solar cells.
The physical origin of the open‐circuit voltage in bulk heterojunction solar cells is still not well understood. While significant evidence exists to indicate that the open‐circuit voltage is limited by the molecular orbital energies of the heterojunction components, it is clear that this picture is not sufficient to explain the significant variations which often occur between cells fabricated from...
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