Anisotropy of Charge Transport in a Uniaxially Aligned Fused Electron-Deficient Polymer Processed by Solution Shear Coating.
Lee, Seon Baek
Perdigão, Luís MA
Warr, Daniel A
Senanayak, Satyaprasad P
Advanced materials (Deerfield Beach, Fla.)
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Xiao, M., Kang, B., Lee, S. B., Perdigão, L. M., Luci, A., Warr, D. A., Senanayak, S. P., et al. (2020). Anisotropy of Charge Transport in a Uniaxially Aligned Fused Electron-Deficient Polymer Processed by Solution Shear Coating.. Advanced materials (Deerfield Beach, Fla.), 32 (23), e2000063. https://doi.org/10.1002/adma.202000063
Precise control of the microstructure in organic semiconductors (OSC) is essential for developing high-performance organic electronic devices. Here we report a comprehensive charge transport characterization of two recently reported rigid rod conjugated polymers that do not contain single bonds in the main chain. We demonstrate that the molecular design of the polymer makes it possible to achieve an extended linear backbone structure which could be directly visualized by high-resolution scanning tunneling microscopy (STM). The rigid structure of the polymers allows the formation of thin films with uniaxially aligned polymer chains by using a simple one-step, solution-shear / bar coating technique. These aligned films show a high optical anisotropy with a dichroic ratio of up to a factor of 6. Transport measurements performed using top-gate bottom-contact field-effect transistors exhibit a high saturation electron mobility of 0.2 cm2 V1s1 along the alignment direction, which is more than six times higher than the value reported in our previous work. This work demonstrates that this new class of polymers is able to achieve mobility values comparable to state-of-the-art n-type polymers and identifies an effective processing strategy for this class of rigid-rod polymer system to optimize their charge transport properties.
European Research Council (610115)
External DOI: https://doi.org/10.1002/adma.202000063
This record's URL: https://www.repository.cam.ac.uk/handle/1810/303862
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