Dresden 2009 – wissenschaftliches Programm
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SYOP: Symposium Organic Photovoltaics: From Single Molecules to Devices
SYOP 4: Organic Photovoltaics: from Single Molecules to Devices
SYOP 4.57: Poster
Donnerstag, 26. März 2009, 16:30–19:00, P1A
The effect of polymer-fullerene interaction on film morphology and performance of polyfluorene-based solar cells — •Ana Sofia Anselmo1, Ellen Moons1, Krister Svensson1, Mats Andersson2, Andrzej Budkowski3, and Andrzej Bernasik4 — 1Karlstad University, Karlstad, Sweden — 2Chalmers University of Technology, Göteborg, Sweden — 3Jagiellonian University, Kraków, Poland — 4AGH - University of Science and Technology, Kraków, Poland
In our research project, we focus on morphological issues in thin-films spin-coated from blends of low-bandgap polyfluorenes and a fullerene derivative (PCBM). Characterization of the thin-film topography is performed through AFM, and the in-depth organization of the blend components through dynamic SIMS. Solar cell devices are fabricated to correlate device performance and film morphology.
Previous studies have shown multilayer-structured films of polyfluorene:fullerene blends to form spontaneously under specific conditions, which improved solar cell performance [1]. The mechanisms leading to these results can be rationalized with thermodynamic and kinetic models of nucleation and phase separation [2]. Recently an increased tendency for self-stratification was found in a series of films prepared from PCBM blended with polyfluorene copolymers that had been especially synthesized with a varying fraction of a phenolic monomer for enhanced polymer-fullerene interaction.
[1] Björström, C.M. et al J. Phys.:Condens. Matter 2005, 17, L529-L534; [2] Nilsson, S. et al Macromol. 2007, 40, 8291-8301.