Crystalline and liquid-crystalline conjugated small molecules represent a promising family of semiconductor materials for organic electronics applications. The control of the morphology and optoelectronic properties of small molecules allows tuning their charge transport characteristics and hence, improving the performance of electronic devices. Here, we designed four pentamers based on alternating thiophene and benzothiadiazole moieties and investigated the effect of their structure on the optoelectronic properties, ordering and charge transport characteristics. It is shown that thermal annealing of conjugated pentamers leads to remarkable changes in the microstructure and domain texture of thin films. As a result, an increase in hole mobility for compound M4 by one order of magnitude was achieved. These findings provide a valuable insight into the structure–property relationships for designed small molecules featuring them as promising semiconductor materials for further developing high-performance organic electronics.

中文翻译：

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通过侧链工程和氟取代来调整有序小分子有机半导体中的电荷传输特性

晶体和液晶共轭小分子代表了用于有机电子应用的有前途的半导体材料家族。控制小分子的形态和光电特性可以调整它们的电荷传输特性，从而提高电子器件的性能。在这里，我们设计了四种基于交替噻吩和苯并噻二唑部分的五聚体，并研究了它们的结构对光电特性、有序性和电荷传输特性的影响。结果表明，共轭五聚体的热退火导致薄膜的微观结构和畴结构发生显着变化。结果，化合物M4的空穴迁移率增加达到了一个数量级。这些发现为设计的小分子的结构-性质关系提供了有价值的见解，这些小分子将它们作为有前途的半导体材料进一步开发高性能有机电子产品。