Photogeneration of charge carriers in organic solar cells. The role of nonequilibrium states for electrons and holes

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Abstract

The aim of this study is to consider a photogeneration of charge carriers in nano-structured blends of the donor (D) and acceptor (A) materials. Upon optical excitation photons absorbed in one of these materials produce intramolecular excitons which can diffuse to the D–A interface and form at the interface the interfacial CT states. The interfacial CT state dissociates into a geminate pair of the non-equilibrium mobile electron and hole. In the present study, an empirical model describing thermalization of the non-equilibrium charges within the Coulomb well is proposed. Efficiency of the interfacial CT state dissociation into a pair of free charges is found as a function of the electric field applied, effective temperature and diffusion length of non-equilibrium electron-hole pairs.

About the authors

L. V. Lukin

Semenov Federal Research Center for Chemical Physics, Russian Academy of Sciences

Author for correspondence.
Email: leonid.v.lukin@gmail.com
Russian Federation, Moscow

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