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Interconnecting semiconducting molecules with non-conjugated soft linkers: a way to improve film formation quality without sacrifice in charge mobility

机译:将半导体分子与非共轭软接头互连:一种在不牺牲电荷迁移率的情况下提高成膜质量的方法

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The formation of high quality homogeneous active component films is essential to the fabrication of many organic optoelectronic devices, especially those having a large area module. However, most small molecule (SM) semiconductors are unable to achieve such a goal via solution processing because their large and rigid π-conjugated structures generally drive them to aggregate or crystallize into inhomogeneous domains in the process. In this work, a SM semiconductor (SM-DPP6T) based on a diketopyrrolopyrrole (DPP) center with three thiophene units on both sides encounters the same problem. However, when its molecules are interconnected with soft alkyl linkers and change into a poly(rod-coil) polymer, PRC-DPP6T, the problem is solved. Compared with SM-DPP6T, PRC-DPP6T can form a high quality homogeneous film with much better uniformity and coverage on silicon wafers by spin-coating. Moreover, the so-prepared PRC-DPP6T field-effect transistors displayed a much narrower performance distribution and comparable mobility when compared with those based on SM-DPP6T (0.17 vs. 0.15 cm ~(2) V ~(?1) s ~(?1) ). These results demonstrate that the interconnection of SM semiconductor molecules with soft non-conjugated linkers is a promising way to improve film formation quality while keeping mobility intact.
机译:高质量均质活性成分薄膜的形成对于许多有机光电器件的制造至关重要,尤其是那些具有大面积模块的器件。但是,大多数小分子(SM)半导体无法通过固溶处理实现这一目标,因为它们的大而刚性的π共轭结构通常会驱使它们在此过程中聚集或结晶成不均匀的畴。在这项工作中,基于双酮吡咯并吡咯(DPP)中心且两侧带有三个噻吩单元的SM半导体(SM-DPP6T)遇到相同的问题。但是,当它的分子与柔软的烷基接头相互连接并变成聚(棒-螺旋)聚合物PRC-DPP6T时,问题就解决了。与SM-DPP6T相比,PRC-DPP6T可以通过旋涂在硅片上形成具有更好的均匀性和覆盖性的高质量均匀膜。而且,与基于SM-DPP6T的晶体管相比,如此制备的PRC-DPP6T场效应晶体管表现出更窄的性能分布和可比的迁移率(0.17对0.15 cm〜(2)V〜(?1)s〜( ?1))。这些结果表明,SM半导体分子与柔软的非共轭连接体的互连是提高成膜质量同时保持迁移率完整的一种有前途的方法。

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