Diffusion length and Langevin recombination of singlet and triplet excitons in organic heterojunction solar cells

Chemphyschem : a European Journal of Chemical Physics and Physical Chemistry
David Ompong, Jai Singh

Abstract

We derived new expressions for the diffusion length of singlet and triplet excitons by using the Föster and Dexter transfer mechanisms, respectively, and have found that the diffusion lengths of singlet and triplet excitons are comparable. By using the Langevin recombination theory, we derived the rate of recombination of dissociated free charges into their excitonic states. We found that in some organic polymers the probabilities of recombination of free charge carriers back into the singlet and triplet states are approximately 65.6 and 34.4 %, respectively, indicating that Langevin-type recombination into triplet excitons in organic semiconductors is less likely. This implies that the creation of triplet excitons may be advantageous in organic solar cells, because this may lead to dissociated free charge carriers that can be collected at their respective electrodes, which should result in better conversion efficiency.

References

Dec 17, 2004·Physical Review Letters·V D MihailetchiP W M Blom
Apr 20, 2006·Chemical Communications : Chem Comm·Fengqi GuoKirk S Schanze
Nov 29, 2007·Angewandte Chemie·Barry C Thompson, Jean M J Fréchet
Dec 14, 2012·International Journal of Molecular Sciences·Krishna FeronPaul C Dastoor
Jan 16, 2014·Annual Review of Physical Chemistry·Girish LakhwaniRichard H Friend

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Citations

Apr 9, 2019·Advanced Materials·Yingzhi JinFengling Zhang

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