Band-bending in organic semiconductors: the role of alkali-halide interlayers.

Wang, Haibo; Amsalem, Patrick; Heimel, Georg; Salzmann, Ingo; Koch, Norbert; Oehzelt, Martin · Adv Mater · 2014

basic_science · Level V

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Abstract

Band-bending in organic semiconductors, occurring at metal/alkali-halide cathodes in organic-electronic devices, is experimentally revealed and electrostatically modeled. Metal-to-organic charge transfer through the insulator, rather than doping of the organic by alkali-metal ions, is identified as the origin of the observed band-bending, which is in contrast to the localized interface dipole occurring without the insulating buffer layer.