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Effect of exciton-spin-orbit-photon interaction in the performance of organic solar cells

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Abstract

Photon absorptions leading to singlet and triplet excitonic states in organic solar cells are presented in this study. Applying Fermi’s golden rule, the rates of absorption of singlet and triplet excitons are derived using singlet exciton-photon and triplet exciton-spin-orbit-photon-interaction, respectively, as perturbation operators. The rate of triplet absorption depends on the square of the atomic number and hence heavier atoms play the dominant role. Incorporation of heavy metal atoms in the donor organic material enhances the absorption rate and hence absorption, leading of higher generation of excited charge carriers. This increases the conversion efficiency of organic solar cells. The results are compared with experimental studies.

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Authors and Affiliations

  1. Centre for Renewable Energy and Low Emissions Technology, Research Institute of the Environment and Livelihoods, Charles Darwin University, 0909, Darwin, NT, Australia

    Monishka Rita Narayan

  2. School of Engineering and IT, Charles Darwin University, 0909, Darwin, NT, Australia

    Jai Singh

Authors
  1. Monishka Rita Narayan
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  2. Jai Singh
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Correspondence to Monishka Rita Narayan.

Additional information

Contribution to the Topical Issue “Excitonic Processes in Condensed Matter, Nanostructured and Molecular Materials”, edited by Maria Antonietta Loi, Jasper Knoester and Paul H. M. van Loosdrecht.

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Narayan, M.R., Singh, J. Effect of exciton-spin-orbit-photon interaction in the performance of organic solar cells. Eur. Phys. J. B 86, 47 (2013). https://doi.org/10.1140/epjb/e2012-30614-0

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  • DOI: https://doi.org/10.1140/epjb/e2012-30614-0

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