Steven A. Hawks, Florent Deledalle, Jizhong Yao, Dylan G. Rebois, Gang Li, Jenny Nelson, Yang Yang, Thomas Kirchartz and James R. Durrant Relating Recombination, Density of States, and Device Performance in an Efficient Polymer:Fullerene Organic Solar Cell Blend Advanced Energy Materials 3
The high performance PBDTTT-C:PC71BM BHJ system is limited by recombination of a nongeminate and non-Langevin origin. Both the mobility and carrier lifetime are increased with higher PC71BM content around the optimal range of 50–67 wt.% PC71BM. The likely origin of this observation is a significant shift in density of states with increased PC71BM concentration.
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