Please use this identifier to cite or link to this item:
|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|
Show full item record
Files in This Item:
There are no files associated with this item.
checked on Mar 20, 2019
WEB OF SCIENCETM
checked on Mar 20, 2019
checked on Feb 8, 2019
Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.