Abstract
The authors show that the photogenerated polarons in the PTB7/PCBM copolymer blend, used in organic photovoltaic (OPV) solar cells, couple strongly to six vibrational modes that can be described by the amplitude-mode model. From the relative strengths of the doping-induced absorption of the polaron vibrations and electronic transitions, the polaron's effective mass is obtained, and its influence on carrier mobility unraveled. This understanding of the photophysics of such blends is the next step in engineering lightweight, low-cost, high-efficiency OPV solar panels.
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