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Nano-morphology characterization of organic bulk heterojunctions based on mono and bis-adduct fullerenes |
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| Authors: | Hamed Azimi Darcy Fournier Maarten Wirix Edmund Dobrocka Tayebeh Ameri Florian Machui Sheila Rodman Gilles Dennler Markus C. Scharber Kurt Hingerl Joachim Loos Christoph J. Brabec Mauro Morana |
| Affiliation: | 1. Konarka Austria, Altenbergerstrasse 69, A-4040 Linz, Austria;2. Konarka Technologies Inc. Boott Mill South, 116 John Street, Suite 12, Lowell, MA 01852, USA;3. Christian Doppler Laboratory for Surface Optics, Johannes Kepler University, A-4040 Linz, Austria;4. Laboratory of Materials and Interface Chemistry and Soft Matter CryoTEM Research Unit, Eindhoven University of Technology, PO Box 513, NL-5600 MB Eindhoven, The Netherlands;5. Institute of Electrical Engineering, SAS, Dúbravská cesta 9, 841 04 Bratislava, Slovakia;6. School of Physics and Astronomy, Kelvin Nanocharacterisation Centre, University of Glasgow, Glasgow G12 8QQ, Scotland, UK;7. Friedrich-Alexander-University, Martensstraße 7, 91058 Erlangen, Germany |
| Abstract: | We have studied organic bulk heterojunction photovoltaic devices based on a bridged-bithiophene donor–acceptor type low-band gap polymer blended with PCBM and bis-PCBM. The impact of the molecular arrangement is discussed in terms of the correlation between the solar-cell performance and the degree of crystallization. Differential scanning calorimetry (DSC) and grazing-incidence X-ray diffraction (GIXRD) prove that films with bis-PCBM typically result in more amorphous blends than comparable films with PCBM. Electron tomography (ET) is used to visualize the three dimensional morphology of photoactive layers, confirming the presence of nanofibers, formed in different scales through the thickness in the blended films with mono and bis-fullerenes. |
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