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Correlating molecular structure to field-effect mobility: The investigation of side-chain functionality in phenylene - Thiophene oligomers and their application in field effect transistors

被引：65
作者：
Sung, Andrew
Ling, Mang Mang
Tang, Ming Lee
Bao, Zhenan
Locklin, Jason
机构：
[1] Stanford Univ, Dept Chem Engn, Stanford, CA 94305 USA
[2] Univ Georgia, Dept Chem, Athens, GA 30602 USA
[3] Univ Georgia, Fac Engn, Athens, GA 30602 USA
来源：
CHEMISTRY OF MATERIALS | 2007年 / 19卷 / 09期
关键词：
D O I：
10.1021/cm070117n
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
Short conjugated phenylene (P)-thiophene (T) oligomers with varying alpha and omega alkyl and alkoxy substitutions were synthesized using Stille and Suzuki coupling reactions to investigate the correlation between end-group structure and electronic properties on P2TP and P3TP conjugated cores. Several soluble oligomers were synthesized with 5,5'-bis(4-n-octylphenyl)-2,2'-bithiophene (do-PTTP) showing the highest mobility (mu = 0.18 cm(2) V-1 s(-1)) and on/off ratio of 10(7) at a substrate temperature of 50 degrees C. Thin film morphologies analyzed using atomic force microscopy revealed higher nucleation densities for branched alkoxy side-chain molecules compared to those of their straight alkyl side-chain counterparts. Field-effect mobility showed an inverse correlation to side-group bulkiness, indicating a strong morphological component to charge transport in the P2TP and P3TP series.
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页码：2342 / 2351
页数：10
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