Tracey M. Clarke, Amy M. Ballantyne, Jenny Nelson, Donal D. C. Bradley and James R. Durrant Free Energy Control of Charge Photogeneration in Polythiophene/Fullerene Solar Cells: The Influence of Thermal Annealing on P3HT/PCBM Blends Advanced Functional Materials 18
The improved short circuit current of P3HT/PCBM solar cells with annealing is examined using transient absorption spectroscopy. A two-fold increase in the polaron yield is observed, correlated with a decrease in P3HT ionization potential. This agrees with a model in which efficient dissociation of the bound radical pair is dependent upon it being thermally hot, enabling it to overcome its coulombic binding energy.
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