Theory of exciton dissociation at the interface between a conjugated polymer and an electron acceptor

A. V. Nenashev*, S. D. Baranovskii, M. Wiemer, F. Jansson, R. Osterbacka, A. V. Dvurechenskii, F. Gebhard

*Corresponding author for this work

    Research output: Contribution to journalArticleScientificpeer-review

    47 Citations (Scopus)

    Abstract

    It is a matter of controversy why excitons can efficiently dissociate into free electrons and holes at an intrinsic donor-acceptor interface despite the strong Coulomb interaction between the charges provided by the low dielectric constant in organic materials. We suggest an analytic theory based on the recently developed exact solution for the dissociation problem and show that delocalization of charge carriers along the polymer chains can help the carriers to overcome the Coulomb potential barrier. The main effect here is provided by the kinetic energy of charge carriers caused by quantization. Neglecting the quantization effects leads to underestimation of the dissociation probability by at least an order of magnitude. Particular attention in our study is given to the calculation of carrier energies, which shows that the parabolic approximation together with the first-order correction is sufficient to calculate such energies in most cases.

    Original languageEnglish
    Article number035210
    JournalPhysical Review B - Condensed Matter and Materials Physics
    Volume84
    Issue number3
    DOIs
    Publication statusPublished - 11 Jul 2011
    MoE publication typeA1 Journal article-refereed

    Fingerprint Dive into the research topics of 'Theory of exciton dissociation at the interface between a conjugated polymer and an electron acceptor'. Together they form a unique fingerprint.

    Cite this