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The field dependence and yield of free charge carrier generation in polymer:fullerene blends with varying energetic offsets is not affected when the excitation energy is varied from above band‐gap to direct CT state excitation. Instead, the ability of the CT state to split is dictated by the energetic offset between the relaxed CT state and the charge separated (CS) state.
A so called “energy river” originates in the active layer of a bulk‐heterojunction solar cell as described in work by D. Neher, K. Vandewal, and co‐workers on page 2533. This river contains polymer chains and cools down from its hot origin to a cold front. The riverbank is created by “fullerene walls” with different heights. Flashes create hot electrons in the energy river. These electrons need to...
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