Siloxane Side Chains: A Universal Tool for Practical Applications of Organic Field-Effect Transistors

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• 作者：A-Reum Han ; Junghoon Lee ; Hae Rang Lee ; Jungho Lee ; So-Huei Kang ; Hyungju Ahn ; Tae Joo Shin ; Joon Hak Oh ; Changduk Yang
• 刊名：Macromolecules
• 出版年：2016
• 出版时间：May 24, 2016
• 年：2016
• 卷：49
• 期：10
• 页码：3739-3748
• 全文大小：812K
• 年卷期：0
• ISSN：1520-5835

文摘

To systematically address the intriguing question of how siloxane termini of the side chains relative to alkyl-terminal groups affect the various inherent properties of conjugated polymers—including optical, electrical, and morphological characteristics—we have synthesized model polymers (PDPPTT-R_TG and PDPPTT-Si_TG, together with an accompanying reference PDPPTT-ref) containing an identical backbone yet possessing different terminal groups. In order to fairly compare the end functionalities by eliminating molecular weight (M_n) and polydispersity index (PDI) variations that may act as complicating factors, the polymers used in this study have been controlled to have similar M_n and PDI by carefully optimizing the catalyst system and reaction conditions. Although the molecular packing and orientation behaviors of PDPPTT-R_TG and PDPPTT-Si_TG are very different from each other, both polymers exhibit very high mobility exceeding 4.5 cm² V^–1 s^–1. More meaningfully, organic field-effect transistors (OFETs) based on PDPPTT-Si_TG are highly stable over extended periods in humid environments. Our findings provide new insights into the molecular design strategy aimed at the simultaneous enhancement of charge-carrier mobility and ambient stability, which is of great importance for practical OFET applications.