The charge generation mechanism in organic photovoltaics is a fundamental yet heavily debated issue. All the generated charges recombine at the open-circuit voltage (VOC), so that investigation of recombined charges at VOC provides a unique approach to understanding charge generation. At low temperatures, we observe a decrease of VOC, which is attributed to reduced charge separation. Comparison between benchmark polymer:fullerene and polymer:polymer blends highlights the critical role of charge delocalization in charge separation and emphasizes the importance of entropy in charge generation.
CITATION STYLE
Gao, F., Tress, W., Wang, J., & Inganäs, O. (2015). Temperature dependence of charge carrier generation in organic photovoltaics. Physical Review Letters, 114(12). https://doi.org/10.1103/PhysRevLett.114.128701
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