We report a crystal structure analysis of an unsymmetrical organic semiconductor 2-bromo-7-butyl[1]benzothieno[3,2-b][1]benzothiophene (Br-BTBT-C₄) and its transistor characteristics. Unlike the parent compound 2-butyl-[1]benzothieno[3,2-b][1]benzothiophene (BTBT-C₄) forming a bilayer-type structure composed of head-to-head herringbone packings, Br-BTBT-C₄ forms a dense head-to-tail herringbone packing arranged so as to avoid the steric hinderance between bromine atoms. The intermolecular transfer integrals in Br-BTBT-C₄ suggest its advantage for carrier transport; however, the transistor characteristics of Br-BTBT-C₄ and BTBT-C₄ were found to be almost the same. This is because BTBT-C₄ has a higher crystallinity than Br-BTBT-C₄ in vacuum deposited thin films.

我们报告了不对称有机半导体2-溴-7-丁基[1]苯并噻吩并[3,2-b] [1]苯并噻吩（Br-BTBT-C ₄）的晶体结构分析及其晶体管特性。与母体化合物2-丁基-[1]苯并噻吩并[3,2-b] [1]苯并噻吩（BTBT-C ₄）形成由头对头人字形填料组成的双层结构，Br-BTBT-C_图4形成密集的头尾尾形人字形填料，其布置是为了避免溴原子之间的空间位阻。Br-BTBT-C _4中的分子间转移积分表明了其在载体运输中的优势。但是，Br-BTBT-C ₄和BTBT-C ₄的晶体管特性被发现几乎是相同的。这是因为在真空沉积的薄膜中，BTBT-C ₄具有比Br-BTBT-C ₄更高的结晶度。