Spatially resolved drying kinetics of multi-component solution cast films for organic electronics |
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| Authors: | Benjamin Schmidt-Hansberg Michael Baunach Joachim Krenn Stefan Walheim Uli Lemmer Philip Scharfer Wilhelm Schabel |
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| Affiliation: | 1. Institute of Thermal Process Engineering, Thin Film Technology, Karlsruhe Institute of Technology (KIT), Kaiserstraße 12, D-76131 Karlsruhe, Germany;2. Institute of Nanotechnology, Karlsruhe Institute of Technology (KIT), D-76344 Eggenstein-Leopoldshafen, Germany;3. Light Technology Institute, Karlsruhe Institute of Technology (KIT), Kaiserstraße 12, D-76131 Karlsruhe, Germany;1. Institute of Physics, National Chiao Tung University, 1001, Ta-Hsueh Rd, Hsinchu 300, Taiwan;2. Department of Photonics and Institute of Electro-Optical Engineering, National Chiao Tung University, 1001, Ta-Hsueh Rd, Hsinchu 300, Taiwan;3. Department of Mechanical Engineering, National Chiao Tung University, 1001, Ta-Hsueh Rd, Hsinchu 300, Taiwan |
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| Abstract: | The use of multi-component solvent/additive systems can be beneficial in the manufacturing process of organic and printed electronics because they can provide an extended degree of freedom, in terms of optimized wetting properties or their influence on the molecular ordering during solvent evaporation. For a systematic investigation of the drying process of such systems a technique for the measurement of the evaporation kinetics for micrometer to nanometer thin films is required. Since large area films are drying faster at the edges, we determine the drying kinetics spatially resolved in a linear array of 5 reflectometers simultaneously for single and binary solvent systems for polymer–fullerene (P3HT:PCBM) solutions as used in organic photovoltaic.In order to design a specific drying process, e.g. combined fast and slow evaporation of high or less solving solvents, a spatial resolved numerical investigation of solvent mass transfer is addressed. A numerical approach including the effect of a moving drying front shows reasonable agreement for single and binary solvent systems with spatially resolved experimental data. The effect of the moving drying front accelerates the drying kinetics at a distinct position as the front approaches and must also be considered for integral measurements (e.g. gravimetric experiments). |
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