Symmetry Breaking in Side Chains Leading to Mixed Orientations and Improved Charge Transport in Isoindigo-alt-Bithiophene Based Polymer Thin Films
- Purdue Univ., West Lafayette, IN (United States); Zhejiang Univ., Hangzhou (China)
- Purdue Univ., West Lafayette, IN (United States)
- Department of Chemical &, Biomolecular Engineering, University of Illinois at Urbana—Champaign, 600 South Mathews Avenue, Urbana, Illinois 61801, United States
- Purdue Univ., West Lafayette, IN (United States); Tsinghua Univ., Beijing (China)
- Univ. of Illinois at Urbana-Champaign, IL (United States)
- Zhejiang Univ., Hangzhou (China)
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. In this work, 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 cm2 V–1 s–1 with a maximum value of 5.1 cm2 V–1 s–1, in comparison with 0.47 and 0.51 cm2 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.
- Research Organization:
- Argonne National Laboratory (ANL), Argonne, IL (United States). Advanced Photon Source (APS)
- Sponsoring Organization:
- US Department of the Navy, Office of Naval Research (ONR); Zhejiang University; China Scholarship Council (CSC); USDOE Office of Science (SC)
- Grant/Contract Number:
- N00014-16-1-2551; AC02-06CH11357
- OSTI ID:
- 1397297
- Journal Information:
- ACS Applied Materials and Interfaces, Vol. 9, Issue 30; ISSN 1944-8244
- Publisher:
- American Chemical Society (ACS)Copyright Statement
- Country of Publication:
- United States
- Language:
- ENGLISH
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