External-force-driven solution epitaxy of large-area 2D organic single crystals for high-performance field-effect transistors
),
Xiaohong Zhang(
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Growth of two-dimensional (2D) organic single crystals (2DOSCs) on water surface has attracted increasing attention, because it can serve as a molecularly flat and defect-free substrate. However, large-area growth of 2DOSCs with controllable crystal orientation on water surface remains a key challenge. Herein, we develop a simple method, i.e. external-force-driven solution epitaxy (EFDSE), for the large-area growth of 2DOSCs at air/water interface. Using 2, 7-didecylbenzothienobenzothiophene (C10-BTBT) as an example, high-quality 2D C10-BTBT crystals on centimeter scale are generated by directionally controlling the spreading of organic solution on water surface with external force. Benefiting from the controllable crystal orientation with optimal charge transport, the corresponding 2DOSC-based organic field-effect transistors (OFETs) exhibit a high carrier mobility of 13.5 cm2·V-1·s-1 (effective mobility ≈ 5.4 cm2·V-1·s-1 according to a reliability factor of 40%), which represents the best result achieved for water-surface-assembled 2DOSC-based OFETs. Furthermore, by transferring the C10-BTBT 2DOSCs to flexible substrates, devices with excellent bending stability are achieved. It is anticipated that our method will provide new insight into the controllable growth of large-area 2DOSCs for high-performance organic devices.
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External-force-driven solution epitaxy of large-area 2D organic single crystals for high-performance field-effect transistors
), Xiaohong Zhang(
)
Abstract
Growth of two-dimensional (2D) organic single crystals (2DOSCs) on water surface has attracted increasing attention, because it can serve as a molecularly flat and defect-free substrate. However, large-area growth of 2DOSCs with controllable crystal orientation on water surface remains a key challenge. Herein, we develop a simple method, i.e. external-force-driven solution epitaxy (EFDSE), for the large-area growth of 2DOSCs at air/water interface. Using 2, 7-didecylbenzothienobenzothiophene (C10-BTBT) as an example, high-quality 2D C10-BTBT crystals on centimeter scale are generated by directionally controlling the spreading of organic solution on water surface with external force. Benefiting from the controllable crystal orientation with optimal charge transport, the corresponding 2DOSC-based organic field-effect transistors (OFETs) exhibit a high carrier mobility of 13.5 cm2·V-1·s-1 (effective mobility ≈ 5.4 cm2·V-1·s-1 according to a reliability factor of 40%), which represents the best result achieved for water-surface-assembled 2DOSC-based OFETs. Furthermore, by transferring the C10-BTBT 2DOSCs to flexible substrates, devices with excellent bending stability are achieved. It is anticipated that our method will provide new insight into the controllable growth of large-area 2DOSCs for high-performance organic devices.
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Acknowledgements
This work was supported by the National Natural Science Foundation of China (Nos. 51672180, 51622306, and 21673151), Natural Science Foundation of Jiangsu Province of China (No. BK20180845), Qing Lan Project, 111 project, and the Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD). The authors thank the Collaborative Innovation Center of Suzhou Nano Science and Technology, Soochow University and Beamline BL14B1 (Shanghai Synchrotron Radiation Facility) for providing beam time.
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