Charge-carrier transport in smectic mesophases of biphenyls
Charge-carrier transport in smectic mesophases of biphenyls
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DOI：
10.1063/1.2794709
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发表时间：
2007-10
影响因子：
3.2
通讯作者：
A. Ohno;Akihide Haruyama;K. Kurotaki;J. Hanna
中科院分区：
文献类型：
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作者：
A. Ohno;Akihide Haruyama;K. Kurotaki;J. Hanna
利用飞行时间实验研究了具有近晶相结构的最简单棒状液晶之一-ω，ω′-烷基烷氧基联苯的电荷输运性质.对于近晶B（SmB）和近晶E（SmE）相中的空穴，确定了10 - 3 cm 2 scinV s的迁移率。这种高电子迁移率，可与无定形有机半导体中的最高迁移率相比，表明包括小芳香族化合物在内的这种简单分子的自组织在增强有机材料中的电荷传输方面非常有效。然而，这两种近晶型中间相的迁移率依赖于温度，这不是以前报道的其他典型的近晶型液晶的情况。有趣的是，在SmE阶段的流动性表现出Poole-Frenkel型的场依赖性。详细的实验研究表明，这种场依赖性不是由于化学污染物或结构缺陷（如...
The charge-transport properties of ω,ω′-alkylalkoxylbiphenyls, one of the simplest calamitic (rodlike) liquid crystals exhibiting smectic mesophases, were investigated using the time-of-flight experiments. A mobility of ∼10−3 cm2∕V s was determined for holes in both smectic B (SmB) and smectic E (SmE) phases. This high electronic mobility, comparable to the highest mobilities in amorphous organic semiconductors, indicates that the self-organization of such simple molecules including small aromatic compounds is quite effective in enhancing the charge transport in organic materials. The mobilities of both smectic mesophases, however, depend on temperatures, which is not the case for other typical smectic liquid crystals reported previously. Interestingly, the mobility in the SmE phase exhibits a Poole–Frenkel type of field dependence. Detailed experimental studies have shown that this field dependence is not due to the trapping effect of carriers caused by chemical contaminants or structural defects such as...