Journal
PHYSICAL REVIEW LETTERS
Volume 114, Issue 12, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.114.128701
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Funding
- National Basic Research Program of China [2015CB932200]
- Natural Science Foundation of Jiangsu [BK20131413]
- National Natural Science Foundation of China [11474164]
- Swedish Research Council (VR)
- European Commission Marie Sklodowska-Curie actions
- Swedish Energy Agency
- Knut and AliceWallenberg foundation (KAW)
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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.
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