Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 9, Issue 30, Pages 25426-25433Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.7b07624
Keywords
asymmetric side chains; isoindigo-based polymers; field-effect transistors; bimodal orientation; three-dimensional charge transport
Funding
- startup fund from Purdue University
- Office of Naval Research Young Investigator Program (ONR YIP) [N00014-16-1-2551]
- MOE Key Laboratory of Macromolecular Synthesis and Functionalization, Zhejiang University [2016MSF003]
- China Scholar Council
- DOE Office of Science [DE-AC02-06CH11357]
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The selection of side chains is important in design of conjugated polymers. It not only affects their intrinsic physical properties, but also has an impact on thin film morphologies. Recent reports suggested that a face-on/edge-on bimodal orientation observed in polymer thin films may be responsible for a three-dimensional (3D) charge transport and leads to dramatically improved mobility in donor acceptor based conjugated polymers. To achieve a bimodal orientation in thin films has been seldom explored from the aspect of molecular design. Here, we demonstrate a design strategy involving the use of asymmetric side chains that enables an isoindigo-based polymer to adopt a distinct bimodal orientation, confirmed by the grazing incidence X-ray diffraction. As a result, the polymer presents an average high mobility of 3.8 +/- 0.7 cm(2) V-1 s(-1) with a maximum value of 5.1 cm(2) V-1 s(-1), in comparison with 0.47 and 0.51 cm(2) V-1 s(-1) obtained from the two reference polymers. This study exemplifies a new strategy to develop the next generation polymers through understanding the property-structure relationship.
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