Alkyl Chain Length Dependence of Field-Effect Mobilities in Regioregular Poly(3-Alkylthiophene) Films
Alkyl Chain Length Dependence of Field-Effect Mobilities in Regioregular Poly(3-Alkylthiophene) Films
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立体规则聚（3-烷基噻吩）薄膜中场效应迁移率的烷基链长度依赖性
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发表时间：
2000
期刊：
影响因子：
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通讯作者：
M. Rikukawa
中科院分区：
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作者：
K. Kaneto;W. Y. Lim;W. Takashima;T. Endo;M. Rikukawa
在104V/cm左右的电场下，用场效应研究了区域规则聚(3-烷基硫烯)(PAT，烷基=丁基、己基、正十一基、十二基和十八基)铸膜中的载流子迁移率。结果表明，聚(3-丁基噻吩基)的载流子迁移率为1.0×10-2cm2/vs，是迄今为止聚噻吩族中最大的载流子迁移率，比聚(3-十八烷基噻吩基)的载流子迁移率大3~4个数量级。这一结果表明，取代的烷基链对π-共轭主链之间的载流子迁移起到了阻挡作用，并主要决定了迁移率。所有PATT的剩余载流子密度为1015-1016 cm-3，而烷基链较短的PATT的剩余载流子密度略低。场效应迁移率与飞行时间法的估计值几乎相同。
Carrier mobilities have been studied using the field effect in regioregular poly(3-alkylthiphene) (PAT, alkyl=butyl, hexyl, decyl, dodecyl and octadecyl) cast films at a field of around 104 V/cm. It was found that the carrier mobility of poly(3-butylthiophene) is 1.0×10-2 cm2/Vs, which is the largest one to date in the polythiophene family and three to four orders of magnitude larger than that of poly(3-octadecylthiophene). This result indicates that the substituted alkyl chain plays the role of a barrier to carrier migration between π-conjugated main chains, and primarily determines the mobility. The residual carrier densities are 1015 to 1016 cm-3 for all PATs and slightly lower for PATs with shorter alkyl chains. The field-effect mobilities are nearly the same as the values estimated by the time-of-flight method.