Fast ambipolar carrier transport in smectic phases of phenylnaphthalene liquid crystal
Fast ambipolar carrier transport in smectic phases of phenylnaphthalene liquid crystal
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苯基萘液晶近晶相中的快速双极载流子传输
DOI：
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发表时间：
1997
期刊：
影响因子：
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通讯作者：
J. Hanna
中科院分区：
文献类型：
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作者：
M. Funahashi;J. Hanna
用飞行时间法研究了新型钙钛矿液晶2-(4‘-辛基苯基)-6-十二烷氧基萘(8-PNP-O12)的载流子输运。在8-PNP-O12的两个近晶相中观察到快速双极电子传导。在低温近晶相(Sm1)中，载流子迁移率为1.6x10−3 cm2/V⋅S，在高温相(Sm2)中，载流子迁移率为2.5×10 4−4 cm2/V⋅S，与载流子符号，即电子和空穴无关。在各向同性相也观察到较慢的双极输运，其迁移率为8×10−5 cm~2/V⋅S，迁移率与外加电场和温度无关。
The carrier transport of a new calamitic liquid crystal, i.e., 2-(4′-octylphenyl)6-dodecyloxynaphthalene (8-PNP-O12) was investigated by the time-of-flight technique. The fast ambipolar electronic conduction was observed in two smectic phases of 8-PNP-O12. The carrier mobilities were determined to be 1.6×10−3 cm2/V⋅s in the lower temperature smectic phase (Sm1) between 79 and 100 °C and to be 2.5×10−4 cm2/V⋅s in the higher temperature phase (Sm2) between 100 and 121 °C, regardless of carrier signs, i.e., electron and hole. The slower ambipolar transport was observed in isotropic phase as well, whose mobility was 8×10−5 cm2/V⋅s. These mobilities were independent of applied electric fields and temperature.