Fu Beibei, Yang Fangxu, Sun Lingjie, Zhao Qiang, Ji Deyang, Sun Yajing, Zhang Xiaotao, Hu Wenping
Tianjin Key Laboratory of Molecular Optoelectronic Sciences, Department of Chemistry, School of Science, Tianjin University & Collaborative Innovation Center of Chemical Science and Engineering (Tianjin), Tianjin, 300072, P. R. China.
Joint School of National University of Singapore and Tianjin University, International Campus of Tianjin University, Binhai New City, Fuzhou, 350207, P. R. China.
Adv Mater. 2022 Sep;34(39):e2203330. doi: 10.1002/adma.202203330. Epub 2022 Aug 26.
Bendable organic single crystals are promising candidates for flexible electronics owing to their superior charge-transport properties. However, large-area high-quality organic single crystals are rarely available on the polymer substrates generally used in flexible electronics. Here, a surface-assisted assembly strategy based on a polymer modification, poly(amic acid) (PAA), is developed to grow large-area organic singe crystals on polymer substrates using a simple drop-casting method. The unique surface properties of PAA that enable molecular solution superwetting and promote molecular ordered assembly produce an extraordinary self-driven "meniscus-guided coating" behavior, enabling the fabrication of millimeter-sized, highly aligned organic single crystals for a variety of organic semiconductors. Organic field-effect transistors based on a mode molecule of 2,7-dioctyl[1]benzothieno[3,2-b][1]benzothiophene demonstrate the highest (average) mobility of 18.6 cm V s (15.9 cm V s ), attractively low operating voltage of -3 V, and high flexible durability. The results shed light on the large-area fabrication of organic single crystals on polymer dielectrics toward high-performance and integrated plastic electronics.
可弯曲有机单晶因其优异的电荷传输特性，有望成为柔性电子学的候选材料。然而，在柔性电子学中常用的聚合物衬底上，大面积高质量的有机单晶却很少见。在此，基于聚合物改性聚酰胺酸（PAA）开发了一种表面辅助组装策略，采用简单的滴铸法在聚合物衬底上生长大面积有机单晶。PAA独特的表面性质能够实现分子溶液的超润湿性并促进分子有序组装，产生一种非凡的自驱动“弯月面引导涂层”行为，从而能够制造出毫米尺寸、高度取向的多种有机半导体有机单晶。基于2,7-二辛基[1]苯并噻吩并[3,2-b][1]苯并噻吩这种典型分子的有机场效应晶体管表现出高达18.6 cm² V⁻¹ s⁻¹（平均为15.9 cm² V⁻¹ s⁻¹）的迁移率、低至-3 V的诱人工作电压以及高柔性耐久性。这些结果为在聚合物电介质上大面积制备有机单晶以实现高性能和集成塑料电子学提供了思路。
