期刊
CHEMISTRY OF MATERIALS
卷 24, 期 10, 页码 1762-1770出版社
AMER CHEMICAL SOC
DOI: 10.1021/cm300117x
关键词
polymeric field-effect transistors; structure-property relationship; conjugated polymers; organic electronics
资金
- Ministry of Science and Technology [2009CB623601]
- National Natural Science Foundation of China
Ten isoindigo-based polymers were synthesized, and their photophysical and electrochemical properties and device performances were systematically investigated. The HOMO levels of the polymers were tuned by introducing different donor units, yet all polymers exhibited p-type semiconducting properties. The hole mobilities of these polymers with centrosymmetric donor units exceeded 0.3 cm(2) V-1 s(-1), and the maximum reached 1.06 cm(2) V-1 s(-1). Because of their low-lying HOMO levels, these copolymers also showed good stability upon moisture. AFM and GIXD analyses revealed that polymers with different symmetry and backbone curvature were distinct in lamellar packing and crystallinity. DFT calculations were employed to help us propose the possible packing model. Based on these results, we propose a design strategy, called molecular docking, to understand the interpolymer pi-pi stacking. We also found that polymer symmetry and backbone curvature affect interchain molecular docking of isoindigo-based polymers in film, ultimately leading to different device performance. Finally, our design strategy maybe applicable to other reported systems, thus representing a new concept to design conjugated polymers for field-effect transistors.
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