Alkyl chain length dependence of the field-effect carrier mobility in regioregular poly(3-alkylthiophene)s

被引:154
作者
Babel, A
Jenekhe, SA [1 ]
机构
[1] Univ Washington, Dept Chem Engn, Seattle, WA 98195 USA
[2] Univ Washington, Dept Chem, Seattle, WA 98195 USA
关键词
poly(3-alkylthiophene)s; organic transistors; structure-mobility relationship; poly(3-hexylthiophene) transistors; carrier mobility; alkyl chain length;
D O I
10.1016/j.synthmet.2004.09.033
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
The field-effect mobility of holes in regioregular poly(3-alkylthiophene)s was determined for a series of 5 alkyl chain lengths from C-4 (n-butyl) to C-12 (n-dodecyl). Contrary to a previous report, a non-monotonic dependence of field-effect mobility on alkyl chain length was found. The average hole mobility varied from 1.2 x 10(-3) cm(2)/Vs in poly(3-butylthiophene) and 1 x 10(-2) cm(2)/Vs in poly(3-hexylthiophene) to 2.4 x 10(-5) cm(2)/Vs for poly(3-dodecylthiophene). We believe that the hexyl side chain is optimum for charge transport because of better self-organization in poly(3-hexylthiophene) compared to other polymers in the series. The present results provide an important structure-carrier mobility relationship for the regioregular poly(3-alkylthiophene)s which are of wide interest for thin film transistors and photovoltaic cells. (C) 2004 Elsevier B.V. All rights reserved.
引用
收藏
页码:169 / 173
页数:5
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