Conformation, Molecular Packing, and Field Effect Mobility of Regioregular ,
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- 作者：Nataliya Kiriy ; Anton Kiriy ; Vera Bocharova ; Manfred Stamm ; Stephan Richter ; Matthias Plö ; tner ; Wolf-Joachim Fischer ; Frederik C. Krebs ; Irena Senkovska ; and Hans-Juergen Adler
- 刊名：Chemistry of Materials
- 出版年：2004
- 出版时间：November 16, 2004
- 年：2004
- 卷：16
- 期：23
- 页码：4757 - 4764
- 全文大小：746K
- 年卷期：v.16,no.23(November 16, 2004)
- ISSN：1520-5002
文摘
Improved synthesis, charge carrier mobility, conformation, crystalline structure, andmolecular packing of the regiochemically pure 4',3' '' '-dihexyl-2,2';5',2' ';5' ',2' '';5' '',2' '' ';5' '' ',2' '' ''-sexithiophene (
,'-DH6T) are reported. The sum of charge carrier mobilities of ,'-DH6Tmeasured by the pulse-radiolysis time-resolved microwave conductivity (PR-TRMC) techniquewas found to be 
min = 3.9 × 10-3 cm2 V-1 s-1, which is comparable with the PR-TRMCmobility found for 
,
-DH6T. The field-effect mobility (FEM) of ,'-DH6T was found to beon the order of 10-5 cm2 V-1 s-1, which is considerably less than the FEM of ,-DH6T. Tounderstand the reason for such poor macroscopic electrical properties, the conformation andthe molecular packing of ,'-DH6T were systematically studied by means of UV-visspectroscopy, scanning electron microscopy (SEM), atomic force microscopy (AFM), and X-raytechniques. Absorption spectra of a ,'-DH6T spin-cast film indicate the planar conformationof the aromatic backbone. SEM and AFM reveal the formation of an ordered lamellar phase.As a single-crystal X-ray study shows, ,'-DH6T exhibits less dense crystalline packingthan ,-DH6T. In contrast to the almost upright orientation of ,-DH6T molecules againstthe substrate (tilt angle about 68
), the long axis of ,'-DH6T molecules and the surfaceplane form an angle of ~20. Thus, the crystalline structure of ,-DH6T "allows" the currentto flow along the molecular stacks; the crystalline structure of ,'-DH6T suppresses thecharge transport.
,'-DH6T) are reported. The sum of charge carrier mobilities of ,'-DH6Tmeasured by the pulse-radiolysis time-resolved microwave conductivity (PR-TRMC) techniquewas found to be min = 3.9 × 10-3 cm2 V-1 s-1, which is comparable with the PR-TRMCmobility found for ,-DH6T. The field-effect mobility (FEM) of ,'-DH6T was found to beon the order of 10-5 cm2 V-1 s-1, which is considerably less than the FEM of ,-DH6T. Tounderstand the reason for such poor macroscopic electrical properties, the conformation andthe molecular packing of ,'-DH6T were systematically studied by means of UV-visspectroscopy, scanning electron microscopy (SEM), atomic force microscopy (AFM), and X-raytechniques. Absorption spectra of a ,'-DH6T spin-cast film indicate the planar conformationof the aromatic backbone. SEM and AFM reveal the formation of an ordered lamellar phase.As a single-crystal X-ray study shows, ,'-DH6T exhibits less dense crystalline packingthan ,-DH6T. In contrast to the almost upright orientation of ,-DH6T molecules againstthe substrate (tilt angle about 68), the long axis of ,'-DH6T molecules and the surfaceplane form an angle of ~20. Thus, the crystalline structure of ,-DH6T "allows" the currentto flow along the molecular stacks; the crystalline structure of ,'-DH6T suppresses thecharge transport.© 2004-2018 中国地质图书馆版权所有 京ICP备05064691号 京公网安备11010802017129号 地址：北京市海淀区学院路29号 邮编：100083 电话：办公室：(+86 10)66554848；文献借阅、咨询服务、科技查新：66554700 |