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In organic solar cells based on polymer:fullerene blends, energy is lost due to electron transfer from polymer to fullerene. Minimizing the difference between the energy of the polymer exciton (ED*) and the energy of the charge transfer state (ECT) will optimize the open‐circuit voltage (Voc). In this work, this energy loss ED*‐ECT is measured directly via Fourier‐transform photocurrent spectroscopy...
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