Fast ambipolar carrier transport and easy homeotropic alignment in a metal-free phthalocyanine derivative
Fast ambipolar carrier transport and easy homeotropic alignment in a metal-free phthalocyanine derivative
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DOI：
10.1143/jjap.44.l1310
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发表时间：
2005-01-01
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影响因子：
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通讯作者：
Bushby, RJ
中科院分区：
文献类型：
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作者：
Iino, H;Takayashiki, Y;Bushby, RJ
本文用飞行时间方法研究了无金属酞菁衍生物1，4，8，11，15，18，22，25-八辛基酞菁（8H（2）Pc）在不同相中的载流子输运。当从各向同性相冷却时，8H 2 Pc的分散的柱状相容易自组织成垂直于衬底的柱。我们发现，明确的过境观察，不仅为阳性载体，但也为阴性载体。对于在85 ℃下的柱状矩形相，空穴和电子迁移率非常高，分别为0.2和0.3 cm（2）/（V（.）s），分别。这些迁移率既不依赖于电场也不依赖于温度。这种双极载流子输运即使在环境气氛中也容易观察到。有趣的是，在各向同性相中的迁移率为10（-3）cm（2）/（V（.）s），并且不依赖于温度，这表明电子传导也由该相中的电荷载流子传输控制。
We have investigated charge carrier transport in the various phases of the metal-free phthalocyanine derivative, 1,4,8,11, 15,18,22,,25-octaoctylphthalocyanine (8H(2)Pc), by the time-of-flight method. The discotic columnar phase of 8H2Pc easily self-organizes in columns perpendicular to the substrate when cooled from the isotropic phase. We found that well-defined transits were observed, not only for positive carriers, but also for negative carriers. For the columnar rectangular phase at 85 degrees C the hole and electron mobilities were very high at 0.2 and 0.3 cm(2) /(V(.)s), respectively. These mobilities depend on neither electric field nor temperature. This ambipolar carrier transport was easily observed even in an ambient atmosphere. interestingly, the mobility in the isotropic phase was of the order of 10(-3) cm(2) /(V(.)s) and did not depend on temperature, which suggests that the electronic conduction is governed by charge carrier transport in that phase as well.