Berlin 2015 – scientific programme
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DS: Fachverband Dünne Schichten
DS 39: Poster Session II
DS 39.29: Poster
Thursday, March 19, 2015, 16:00–18:30, Poster F
Analytical Transmission Electron Microscopy on Small Molecule Bulk Heterojunction Organic Solar Cells — Diana Nanova1,2,4, •Lars Müller1,2,4, Felix Schell2,4, Michael Scherer1,2,4, Anne K. Kast3,4, Pirmin Kükelhahn2,3, Rasmus R. Schröder3,4, Robert Lovrincic1,4, and Wolfgang Kowalsky1,4 — 1Institute for High-Frequency Technology, TU Braunschweig, Germany — 2Kirchhoff-Institute for Physics, Heidelberg University, Germany — 3CellNetworks, BioQuant, Heidelberg University, Germany — 4InnovationLab GmbH, Heidelberg, Germany
Understanding the interplay of morphology, material crystallinity and device performance in organic bulk heterojunction (BHJ) solar cells is crucial for the development of efficient devices. The application of electron energy loss spectroscopy (EELS), electron diffraction, and electron tomography in a transmission electron microscope (TEM) allows for a detailed analysis of the BHJ. Here, we investigate the influence of substrate composition and temperature during deposition on fluorinated zinc phthalocyanine / fullerene BHJs. Combined with device performance data, the influence of these two separately varied parameters is studied in terms of 3D-morphology and long range order within the materials. With additional EELS measurements that reveal electronic and even dielectric properties of the materials by application of the Kramers-Kronig relations, a diversified description of the investigated layer can be given.