Alkyl chain length dependence of field-effect mobilities in regioregular poly(3-alkylthiophene) films

被引：105

作者：

Kaneto, K ^{[1
]}

Lim, WY

Takashima, W

Endo, T

Rikukawa, M

机构：

[1] Kyushu Inst Technol, Dept Comp Sci & Elect, Iizuka, Fukuoka 8208502, Japan

[2] Sophia Univ, Dept Chem, Chiyoda Ku, Tokyo 1028554, Japan

来源：

JAPANESE JOURNAL OF APPLIED PHYSICS PART 2-LETTERS & EXPRESS LETTERS | 2000年 / 39卷 / 8B期

关键词：

conducting polymers; poly(3-alkylthiophene); mobility; field-effect mobility; regioregularity;

D O I：

10.1143/JJAP.39.L872

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

Carrier mobilities have been studied using the field effect in reeioregular poly(3-alkylthiphene) (PAT, alkyl = butyl, hexyl, decyl, dodecyl and octadecyl) cast films at a field of around 10(4) V/cm. It was found that the carrier mobility of poly(3-butylthiophene) is 1.0 x 10(-2) cm(2)/V.s, 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 K-conjugated main chains, and primarily determines the mobility. The residual carrier densities are 10(15) to 10(16) 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.

引用

页码：L872 / L874

页数：3

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