Dresden 2014 – wissenschaftliches Programm
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DS: Fachverband Dünne Schichten
DS 35: Poster I: Application of thin films; Focus session: Sensoric micro and nano-systems; Focus Session: Sustainable photovoltaics with earth abundant materials; Graphen (joint session with TT; MA; HL; DY; O); Ion and electron beam induced processes; Layer properties: electrical, optical, and mechanical properties; Magnetic/organic interfaces, spins in organics and molecular magnetism; Micro- and nanopatterning (jointly with O); Organic electronics and photovoltaics (jointly with CPP, HL, O); Thermoelectric materials
DS 35.63: Poster
Mittwoch, 2. April 2014, 17:00–20:00, P1
Morphology of Small Molecule Vacuum Deposited Organic Solar Cells from Analytical Transmission Electron Microscopy — •Felix Schell1,2, Tobias Jenne1,2, Diana Nanova1,2,3, Anne Katrin Kast1,2,4, Michael Scherer1,3, Robert Lovrincic1,3, Rasmus R. Schröder1,4, and Wolfgang Kowalsky1,2,3 — 1InnovationLab GmbH, Heidelberg, Germany — 2Kirchhoff-Institute for Physics, Heidelberg University, Germany — 3Institute for High-Frequency Technology, TU Braunschweig, Germany — 4CellNetworks, BioQuant, Heidelberg University, Germany
For efficient charge generation and extraction in bulk heterojunction (BHJ) organic solar cells a suitable morphology of the active layer is crucial. However, most imaging techniques cannot distinguish among typical donor/acceptor systems used in BHJs, as these have similar characteristics. It has been shown that spectral information obtained by electron energy loss spectroscopy (EELS) and electron spectroscopic imaging (ESI) can be combined with multivariate statistics and machine learning to yield contrast between the two materials of the interpenetrating network of polymer solar cells. We extend these techniques to small molecule co-evaporated devices using fluorinated zinc phthalocyanine (F4ZnPc) as donor and the fullerene C60 as acceptor. F4ZnPc exhibits strong optical absorption features in EELS. Vacuum deposition of materials allows better control of morphology compared to solution processing, making it possible to directly correlate microstructural with electrical properties and ultimately with the performance of photovoltaic devices.