title: Temperature dependence of charge carrier generation in organic photovoltaics.
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.
authors: Biomolecular and Organic Electronics, IFM, Linköping University, Linköping 58183, Sweden.|Cavendish Laboratory, J J Thomson Avenue, Cambridge CB3 0HE, United Kingdom.
authors: Feng
authors: F
authors: Gao
authors: Biomolecular and Organic Electronics, IFM, Linköping University, Linköping 58183, Sweden.
authors: Wolfgang
authors: W
authors: Tress
authors: Cavendish Laboratory, J J Thomson Avenue, Cambridge CB3 0HE, United Kingdom.|Key Laboratory of Flexible Electronics (KLOFE) and Institute of Advanced Materials (IAM), National Synergistic Innovation Centre for Advanced Materials (SICAM), Nanjing Tech University, 30 South Puzhu Road, Nanjing 211816, China.
authors: Jianpu
authors: J
authors: Wang
authors: Biomolecular and Organic Electronics, IFM, Linköping University, Linköping 58183, Sweden.
authors: Olle
authors: O
authors: Inganäs