Aligned rrP3HT film: Structural order and transport properties

被引:45
作者
Yang, CY
Soci, C
Moses, D
Heeger, AJ
机构
[1] Univ Calif Santa Barbara, Ctr Polymers & Organ Solids, Santa Barbara, CA 93106 USA
[2] Univ Calif Santa Barbara, Mat Res Lab, Santa Barbara, CA 93106 USA
[3] Univ Pavia, INFM, Dipartimento Fis A Volta, I-27100 Pavia, Italy
关键词
polythiophene and derivatives; scanning transmission electron microscopy; X-ray diffraction; polycrystalline thin films; optical absorption spectroscopy; POLY(3-ALKYLTHIOPHENES);
D O I
10.1016/j.synthmet.2005.08.019
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
Aligned regioregular poly(3 hexyl thiophene), rrP3HT, thin films have been fabricated by a rubbing technique. Structural studies indicate orthorhombic crystalline domains (CDs) with c-axis aligned principally along the rubbing direction. The backbones of the macromolecules are stacked along the b-axis, forming a plane of parallel backbones with pi-electron overlap and with side chains between the planes (along the a-axis). There is no pi-overlap between these planes due to the long side chains along the a-axis. The optical and electronic properties are Correlated with the anisotropic structure. Both for light polarized parallel and for light polarized perpendicular to the chain direction, the onset of photocurrent coincides with the onset of absorption. The larger photoconductivity observed with light polarized along the c-axis suggests the films are of sufficiently high quality to reveal the intrinsic anisotropy of the electronic structure. (C) 2005 Elsevier B.V. All rights reserved.
引用
收藏
页码:639 / 642
页数:4
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