Steric effect of halogen substitution in an unsymmetrical benzothienobenzothiophene organic semiconductor

Steric effect of halogen substitution in an unsymmetrical benzothienobenzothiophene organic semiconductor
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不对称苯并噻吩并噻吩有机半导体中卤素取代的空间效应

DOI:
10.1016/j.orgel.2019.105570
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发表时间:
2020
影响因子:
3.2
通讯作者:
Yamada Jun-ichi
Yamada Jun-ichi
中科院分区:
工程技术3区
文献类型:
--
作者:
Kadoya Tomofumi;Mano Shotaro;Hori Aoi;Tahara Keishiro;Sugimoto Kunihisa;Kubo Kazuya;Abe Masaaki;Tajima Hiroyuki;Yamada Jun-ichi

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报道了非对称有机半导体2-bromo-7-butyl[1]benzothieno[3,2-b][1]benzothiophene(BR-BTBT-C4)的晶体结构分析及其晶体管特性。与母体化合物2-butyl-[1]benzothieno[3,2-b][1]benzothiophene(BTBT-C4)形成头头人字形填充组成的双层结构不同,BR-BTBT-C4形成密集的头尾人字形填充,以避免溴原子之间的空间位阻。BR-BTBT-C4的分子间转移积分表明它有利于载流子的传输,然而,BR-BTBT-C4和BTBT-C4的晶体管特性几乎相同。这是因为在真空沉积的薄膜中,BTBT-C4的结晶度高于BR-BTBT-C4。
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-C4forms a dense head-to-tail herringbone packing arranged so as to avoid the steric hindrance between bromine atoms. The intermolecular transfer integrals in Br-BTBT-C4suggest its advantage for carrier transport; however, the transistor characteristics of Br-BTBT-C4and BTBT-C4were found to be almost the same. This is because BTBT-C4has a higher crystallinity than Br-BTBT-C4in vacuum deposited thin films.
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发表时间: 2007-12-26
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