Dr. Konstantinos Fostiropoulos
Helmholtz-Zentrum Berlin für Materialien und Energie
Helmholtz-Zentrum Berlin für Materialien und Energie
12:30, Auditorium A31
Abstract:
We present an overview on the fundamental problems of organic photovoltaic (OPV) systems with molecular organic absorber layers prepared by evaporation techniques. Limitations of the transport properties at hybrid interfaces between transparent conductive oxide electrodes and organic absorber layers are discussed. Preparation methods for oriented growth of molecular absorber layers in bilayer heterojunction OPV architectures as well as optimized internal morphology of phase seperated organic donor-acceptor blends in bulk heterojunction OPV architectures. For the analysis of the electronic properties and molecular orientation at the hybrid interface x-ray spectroscopic methods (XPS, NEXAFS) are applied, whereas the bulk structure and nano-morphology of ultra-thin organic layers was analyzed by scattering (XRD, TEM) methods. Phase seperation processes on nanometer scale in organic blends are displayed through energy filtered transmission electron microscopy spectral imaging (EFTEM SI).
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