3 years ago

Effect of Alkyl Chain Branching Point on 3D Crystallinity in High N-Type Mobility Indolonaphthyridine Polymers

Effect of Alkyl Chain Branching Point on 3D Crystallinity in High N-Type Mobility Indolonaphthyridine Polymers
Eric F. Manley, Nilushi Wijeyasinghe, Niall Goodeal, Thomas D. Anthopoulos, Tobin J. Marks, Lin X. Chen, Mohammed Al-Hashimi, Anastasia Leventis, Annikki Santala, David M. E. Freeman, Kealan J. Fallon, Hugo Bronstein
Herein, this study investigates the impact of branching-point-extended alkyl chains on the charge transport properties of three ultrahigh n-type mobility conjugated polymers. Using grazing incidence wide-angle X-ray scattering, analysis of the crystallinity of the series shows that while π–π interactions are increased for all three polymers as expected, the impact of the side-chain engineering on polymer backbone crystallinity is unique to each polymer and correlates to the observed changes in charge transport. With the three polymers exhibiting n-type mobilities between 0.63 and 1.04 cm2 V−1 s−1, these results ratify that the indolonaphthyridine building block has an unprecedented intrinsic ability to furnish high-performance n-type organic semiconductors. The effect of alkyl side-chain branching position on charge transport in organic semiconductors exhibiting high crystallinity is discussed herein. This study confirms that the indolonapthryidine building block has an intrinsic ability to facilitate ultrahigh n-type mobility in organic field-effect transistors, of which examples remain lacking, with recorded μe = 0.63–1.04 cm2 V−1 s−1.

Publisher URL: http://onlinelibrary.wiley.com/resolve/doi

DOI: 10.1002/adfm.201704069

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