| CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES |
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Dynamical Process of Dissociation of Excitons in Polymer Chains with Impurities |
| ZHAO Hong-Xia, ZHAO Hui**, CHEN Yu-Guang
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Department of Physics, Tongji University, Shanghai 200092
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ZHAO Hong-Xia, ZHAO Hui, CHEN Yu-Guang 2011 Chin. Phys. Lett. 28 097201 |
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Abstract Within an extended Su–Schrieffer–Heeger model including impurity interactions, the dynamical process of exciton dissociation in the presence of an external electric field is investigated by using a non-adiabatic evolution method. Under the action of impurities, the stability as well as the effective mass of the exciton is reduced. Our results show that the field required to dissociate the excitons depends sensitively on the strength of the impurity potential. As the impurity potential strength increases, the dissociation field decreases effectively. The theoretical results are expected to provide useful predictions concerning which polymers with properly impurity-assisted interactions are likely to be more suitable for use in organic solar cells.
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| Keywords:
72.80.Le
71.35.Aa
71.35.-y
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Received: 02 March 2011
Published: 30 August 2011
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| PACS: |
72.80.Le
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(Polymers; organic compounds (including organic semiconductors))
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71.35.Aa
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(Frenkel excitons and self-trapped excitons)
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71.35.-y
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(Excitons and related phenomena)
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