High-Performance Organic Field-Effect Transistors with Directionally Aligned Conjugated Polymer Film Deposited from Pre-Aggregated Solution

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• 作者：Nam-Koo Kim ; Soo-Young Jang ; Giuseppina Pace ; Mario Caironi ; Won-Tae Park ; Dongyoon Khim ; Juhwan Kim ; Dong-Yu Kim ; Yong-Young Noh
• 刊名：Chemistry of Materials
• 出版年：2015
• 出版时间：December 22, 2015
• 年：2015
• 卷：27
• 期：24
• 页码：8345-8353
• 全文大小：591K
• ISSN：1520-5002

文摘

In this report, we investigate a formation mechanism for polymer chains aligned with various semiconductor polymers and a microstructure for directionally aligned film through systematic analysis that includes polarized UV鈥搗isible鈥搉ear infrared (UV鈥搗is鈥揘IR) absorption spectroscopy, atomic force microscopy, polarized charge modulation microscopy (p-CMM), and incident X-ray diffraction (GIXD) measurements. Through this study, we make two important observations: first, the highly aligned organic polymer semiconductor films are achieved by off-center spin coating of the preaggregated conjugated polymer solution. Second, the directionally aligned conjugated polymer films exhibit a larger anisotropy on the top surface compared with bulk film, which allows effective mobility improvement in top-gate/bottom-contact field-effect transistors with high performance uniformity. Finally, we demonstrate high-mobility organic field-effect transistors (OFETs) (7.25 cm²/(V s)) with a mobility large anisotropy (37-fold) using poly[(E)-1,2-(3,3鈥?dioctadecyl-2,2鈥? dithienyl)ethylene-alt-dithieno-(3,2-b:2鈥?3鈥?d)thiophene] (P18) as the semiconductor layer.