Dissociation of charge transfer excitons at the donor–acceptor interface in bulk heterojunction organic solar cells

Jai Singh, Monishka Narayan, David Ompong, Furong Zhu

    Research output: Contribution to journalArticleResearchpeer-review

    Abstract

    It is emphasized that the formation of charge transfer (CT) excitons in bulk heterojunction (BHJ) organic solar cells (OSCs) does not automatically lead to the dissociation of excitons and generation of charge carriers due to the built-in electric field created by the difference in the work functions of the electrodes. Like Frenkel excitons, CT excitons are also charge neutral excited entities and cannot be efficiently dissociated by such electric field. A condition of the dissociation of CT excitons is proposed and used to derive the rates of exciton dissociation in BHJ OSCs. Results are calculated and compared with experiments for the BHJ OSC of PTB7: PC71BM and found to agree very well qualitatively.

    Original languageEnglish
    Pages (from-to)7095-7099
    Number of pages5
    JournalJournal of Materials Science: Materials in Electronics
    Volume28
    Issue number10
    DOIs
    Publication statusPublished - May 2017

    Fingerprint

    Excitons
    Heterojunctions
    Charge transfer
    heterojunctions
    solar cells
    charge transfer
    excitons
    dissociation
    Electric fields
    electric fields
    Charge carriers
    Organic solar cells
    LDS 751
    charge carriers
    Electrodes
    electrodes
    Experiments

    Cite this

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    title = "Dissociation of charge transfer excitons at the donor–acceptor interface in bulk heterojunction organic solar cells",
    abstract = "It is emphasized that the formation of charge transfer (CT) excitons in bulk heterojunction (BHJ) organic solar cells (OSCs) does not automatically lead to the dissociation of excitons and generation of charge carriers due to the built-in electric field created by the difference in the work functions of the electrodes. Like Frenkel excitons, CT excitons are also charge neutral excited entities and cannot be efficiently dissociated by such electric field. A condition of the dissociation of CT excitons is proposed and used to derive the rates of exciton dissociation in BHJ OSCs. Results are calculated and compared with experiments for the BHJ OSC of PTB7: PC71BM and found to agree very well qualitatively.",
    author = "Jai Singh and Monishka Narayan and David Ompong and Furong Zhu",
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    Dissociation of charge transfer excitons at the donor–acceptor interface in bulk heterojunction organic solar cells. / Singh, Jai; Narayan, Monishka; Ompong, David; Zhu, Furong.

    In: Journal of Materials Science: Materials in Electronics, Vol. 28, No. 10, 05.2017, p. 7095-7099.

    Research output: Contribution to journalArticleResearchpeer-review

    TY - JOUR

    T1 - Dissociation of charge transfer excitons at the donor–acceptor interface in bulk heterojunction organic solar cells

    AU - Singh, Jai

    AU - Narayan, Monishka

    AU - Ompong, David

    AU - Zhu, Furong

    PY - 2017/5

    Y1 - 2017/5

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    AB - It is emphasized that the formation of charge transfer (CT) excitons in bulk heterojunction (BHJ) organic solar cells (OSCs) does not automatically lead to the dissociation of excitons and generation of charge carriers due to the built-in electric field created by the difference in the work functions of the electrodes. Like Frenkel excitons, CT excitons are also charge neutral excited entities and cannot be efficiently dissociated by such electric field. A condition of the dissociation of CT excitons is proposed and used to derive the rates of exciton dissociation in BHJ OSCs. Results are calculated and compared with experiments for the BHJ OSC of PTB7: PC71BM and found to agree very well qualitatively.

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