Dresden 2017 – wissenschaftliches Programm
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DS: Fachverband Dünne Schichten
DS 21: Thin Film Characterisation: Structure Analysis and Composition II
DS 21.9: Vortrag
Dienstag, 21. März 2017, 11:45–12:00, CHE 91
Analytical Electron Microscopy Study to Resolve the Phase Morphology of Organic Solar Cell Blends — •Mona Sedighi1,2, Falk Röder3, Markus Löffler1, Petr Formanek2, and Ehrenfried Zschech4 — 1Dresden Center for Nanoanalysis, Center for Advancing Electronics Dresden (cfaed), Technische Universität Dresden — 2Leibniz-Institut für Polymerforschung Dresden e.V., Dresden — 3Helmholtz-Zentrum Dresden-Rossendorf, Institute of Ion Beam Physics and Materials Research, Dresden, Germany — 4Fraunhofer-Institut für Keramische Technologien und Systeme (IKTS), Dresden
To increase the efficiency of bulk heterojunctions for organic photovoltaic devices (OPV), the complicated photon-to-electron conversion process has to be understood in detail. Most OPV consist of a single bulk-heterojunction active layer; the blend of electron donor (conjugated polymer) and electron acceptor (fullerene) which makes an interpenetrating network of domains, ideally on the length scale of the exciton diffusion length. Therefore, morphology of the active layer significantly contributes to the overall performance of OPV.
Obtaining insights into the morphology of the active layer requires the spatial resolution and a contrast mechanism to discriminate two phases with similar average atomic number. To tackle this challenge, we combine electron microscopy imaging with different analytical techniques; energy dispersive X-ray spectroscopy (EDX) and electron energy loss spectroscopy (EELS) in TEM. We imaged different phases of the donor and acceptor, forming ordered and non-ordered regions, depending on the way the heterojunction is fabricated.