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Temperature dependence of charge carrier generation in organic photovoltaics
Feng Gao1,2, Wolfgang Tress1, Jianpu Wang2,3
1Biomolecular and Organic Electronics, IFM, Linköping University, Linköping 58183, Sweden.
Abstract:
The charge generation mechanism in organic photovoltaics is a fundamental yet heavily debated issue. All the generated charges recombine at the open-circuit voltage (V_{OC}), so that investigation of recombined charges at V_{OC} provides a unique approach to understanding charge generation. At low temperatures, we observe a decrease of V_{OC}, 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.
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