Li Mengmeng, Bin Haijun, Jiao Xuechen, Wienk Martijn M, Yan He, Janssen René A J
Key Laboratory of Microelectronic Devices and Integrated Technology, Institute of Microelectronics, Chinese Academy of Sciences, Beijing, 100029, China.
Molecular Materials and Nanosystems, Institute for Complex Molecular Systems, Eindhoven University of Technology, P.O. Box 513, 5600, MB, Eindhoven, The Netherlands.
Angew Chem Int Ed Engl. 2020 Jan 7;59(2):846-852. doi: 10.1002/anie.201911311. Epub 2019 Nov 20.
It remains a challenge to precisely tailor the morphology of polymer monolayers to control charge transport. Herein, the effect of the dissolution temperature (T ) is investigated as a powerful strategy for morphology control. Low T values cause extended polymer aggregation in solution and induce larger nanofibrils in a monolayer network with more pronounced π-π stacking. The field-effect mobility of the corresponding monolayer transistors is significantly enhanced by a factor of four compared to devices obtained from high T with a value approaching 1 cm V s . Besides that, the solution kinetics reveal a higher growth rate of aggregates at low T , and filtration experiments further confirm that the dependence of the fibril width in monolayers on T is consistent with the aggregate size in solution. The generalizability of the T effect on polymer aggregation is demonstrated using three other conjugated polymer systems. These results open new avenues for the precise control of polymer aggregation for high-mobility monolayer transistors.
精确调整聚合物单层的形态以控制电荷传输仍然是一项挑战。在此，研究了溶解温度（T）的影响，将其作为一种控制形态的有效策略。低T值会导致聚合物在溶液中形成扩展聚集体，并在单层网络中诱导出更大的纳米纤维，具有更明显的π-π堆积。与从高T值获得的器件相比，相应单层晶体管的场效应迁移率显著提高了四倍，其值接近1 cm² V⁻¹ s⁻¹。除此之外，溶液动力学表明在低T时聚集体的生长速率更高，过滤实验进一步证实单层中纤维宽度对T的依赖性与溶液中的聚集体尺寸一致。使用其他三种共轭聚合物体系证明了T对聚合物聚集影响的普遍性。这些结果为精确控制用于高迁移率单层晶体管的聚合物聚集开辟了新途径。
