Ultra-fast charge transfer in organic electronic materials and at hybrid interfaces studied using the core-hole clock technique

R. Friedlein, S. Braun, Machiel Pieter de Jong, W. Osikowicz, M. Fahlman, W.R. Salaneck

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    18 Citations (Scopus)

    Abstract

    The focus of this brief review is the use of resonant photoemission in its “core-hole clock‿ expression for the study of two important problems relevant for the field of organic electronics: the dynamical charge transfer across hybrid organic–inorganic interfaces, and the intermolecular charge transfer in the bulk of organic thin films. Following an outline of the technique, a discussion of its applicability and a short overview of experimental results obtained thus far, two examples are used to illustrate particular results relevant for the understanding of the charge transport in organic electronic devices. First, for Fe(II)-tetraphenylporphyrin molecules on semi-metallic molybdenum disulfide substrates, the electronic coupling to the substrate and the efficiency of charge transport across the interface different for the individual molecular electronic subsystems is discussed. And second, a discotic liquid crystalline material forming columnar assemblies is used to illustrate ultra-fast intermolecular charge transfer on the order of a few femtoseconds indicating an electronic coupling between the phthalocyanine units stronger than expected from the macroscopic charge transport characteristics of the material
    Original languageUndefined
    Pages (from-to)101-106
    Number of pages6
    JournalJournal of electron spectroscopy and related phenomena
    Volume183
    Issue number1-3
    DOIs
    Publication statusPublished - Jan 2011

    Keywords

    • EWI-21086
    • Photoelectron Spectroscopy
    • Organic electronics
    • IR-79223
    • Core-hole-clock
    • METIS-284940
    • Interfaces

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