Impact of polymorphism on the optoelectronic properties of a low-bandgap semiconducting polymer

Mengmeng Li, Ahmed Hesham Balawi, Pieter J. Leenaers, Lu Ning, Gaël H. L. Heintges, Tomasz Marszalek, Wojciech Pisula, Martijn M. Wienk, Stefan C. J. Meskers, Yuanping Yi, Frédéric Laquai and René A. J. Janssen ()
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Mengmeng Li: Eindhoven University of Technology
Ahmed Hesham Balawi: King Abdullah University of Science and Technology (KAUST)
Pieter J. Leenaers: Eindhoven University of Technology
Lu Ning: Chinese Academy of Sciences
Gaël H. L. Heintges: Eindhoven University of Technology
Tomasz Marszalek: Max Planck Institute for Polymer Research
Wojciech Pisula: Max Planck Institute for Polymer Research
Martijn M. Wienk: Eindhoven University of Technology
Stefan C. J. Meskers: Eindhoven University of Technology
Yuanping Yi: Chinese Academy of Sciences
Frédéric Laquai: King Abdullah University of Science and Technology (KAUST)
René A. J. Janssen: Eindhoven University of Technology

Nature Communications, 2019, vol. 10, issue 1, 1-11

Abstract: Abstract Polymorphism of organic semiconducting materials exerts critical effects on their physical properties such as optical absorption, emission and electrical conductivity, and provides an excellent platform for investigating structure–property relations. It is, however, challenging to efficiently tune the polymorphism of conjugated polymers in aggregated, semi-crystalline phases due to their conformational freedom and anisotropic nature. Here, two distinctly different semi-crystalline polymorphs (β1 and β2) of a low-bandgap diketopyrrolopyrrole polymer are formed through controlling the solvent quality, as evidenced by spectroscopic, structural, thermal and charge transport studies. Compared to β1, the β2 polymorph exhibits a lower optical band gap, an enhanced photoluminescence, a reduced π-stacking distance, a higher hole mobility in field-effect transistors and improved photocurrent generation in polymer solar cells. The β1 and β2 polymorphs provide insights into the control of polymer self-organization for plastic electronics and hold potential for developing programmable ink formulations for next-generation electronic devices.

Date: 2019
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DOI: 10.1038/s41467-019-10519-z

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