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|Title:||A transition solvent strategy to print polymer:fullerene films using halogen-free solvents for solar cell applications|
Organic solar cells
|Citation:||Lim, G.-H., Zhuo, J.-M., Wong, L.-Y., Chua, S.-J., Chua, L.-L., Ho, P.K.H. (2014-02). A transition solvent strategy to print polymer:fullerene films using halogen-free solvents for solar cell applications. Organic Electronics: physics, materials, applications 15 (2) : 449-460. ScholarBank@NUS Repository. https://doi.org/10.1016/j.orgel.2013.10.025|
|Abstract:||Inkjet printing is a mask-less non-contact deposition technique that is potentially suited for prototyping and manufacturing of thin-film polymer organic semiconductor devices from digital images. However new strategies are needed to achieve films with good macromorphology (i.e., high-fidelity footprint and uniform cross-section) and nanomorphology on unstructured substrates using a conventional ink-jet. Here we report a new transition solvent strategy to provide the desired film macromorphology and ultrafine nanomorphology in regioregular poly(3-hexylthiophene):phenyl-C61-butyric acid methyl ester (P3HT:PCBM) model films, without using chlorinated solvents. This strategy employs a good volatile solvent in combination with a miscible poor solvent that is much less volatile, which is the reverse of the usual low-high boiling-point solvent method. The good solvent suppresses premature aggregation in the ink head. Its removal by evaporation on the substrate leaves the poor solvent that triggers early π-stacking ordering and/or gelation of the polymer matrix that immobilizes the printed fluid on the substrate, suppressing both contact-line depinning and evaporation-induced solvent flow effects. The resultant donor-acceptor nanomorphology is further improved by vacuum drying at an optimal rate that avoids bubble formation. We have systematically characterized P3HT:PCBM films deposited with different solvents and platen temperatures to identify key macro- and nano-morphology determining processes. High-performance printed P3HT:PCBM solar cells were realized. These findings are applicable also to other printing and coating techniques based on low-viscosity inks. © 2013 The Authors. Published by Elsevier B.V. All rights reserved.|
|Source Title:||Organic Electronics: physics, materials, applications|
|Appears in Collections:||Staff Publications|
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