A high performance diketopyrrolopyrrole (DPP)–based semiconducting polymer is modified with ligands to enable metal coordination, and its subsequent effect as field‐effect transistors is investigated. In specific, pyridine‐2,6‐dicarboxamide (PDCA) units are incorporated in a DPP–based polymer backbone with a content from 0 to 30 mol%, and the resulting polymers are then mixed with Fe(II) ions. The coordination and spontaneous oxidation converts Fe(II) to Fe(III) ions to result in Fe(III)‐containing metallopolymers. The resulting metallopolymers are observed to show good solubility in organic solvents and can be easily processed as thin films. The charge transport characteristics are subsequently investigated through the fabrication of field–effect transistor devices, in which an enhanced charge carrier mobility with the Fe(III)‐containing metallopolymers is observed. In specific, an almost twofold improvement in the charge carrier mobility is obtained for the 20% PDCA‐containing polymer after Fe coordination (from 0.96 to 1.84 cm² V⁻¹ s⁻¹). Furthermore, the operation stability of the metallopolymer‐based devices is found to be significantly improved with low bias stress. Its superior electrical characteristics are attributed to the doping effect of the Fe ions. This study indicates that incorporation of appropriate metallic ions to polymer presents a viable approach to enhance the performance of polymer–based transistor devices.

中文翻译：

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共轭聚合物薄膜晶体管中铁（III）配位赋予的增强的电荷传输和稳定性

一种基于二酮吡咯并吡咯（DPP）的半导体聚合物经配体改性以实现金属配位，并研究了其随后作为场效应晶体管的作用。具体而言，将吡啶2,6-二二甲酰胺（PDCA）单元以0至30 mol％的含量掺入DPP基聚合物主链中，然后将所得聚合物与Fe（II）离子混合。配位和自发氧化将Fe（II）转换为Fe（III）离子，从而生成含Fe（III）的金属聚合物。观察到所得的金属聚合物在有机溶剂中显示出良好的溶解性，并且可以容易地加工成薄膜。随后，通过制造场效应晶体管器件来研究电荷传输特性，其中观察到含Fe（III）的金属聚合物的载流子迁移率提高。特别是，在铁配位后（从0.96到1.84厘米），含20％PDCA的聚合物的载流子迁移率几乎提高了两倍。² V ^-1 s ^-1）。此外，发现低偏应力可显着提高基于金属聚合物的器件的操作稳定性。其优异的电特性归因于Fe离子的掺杂作用。这项研究表明，将适当的金属离子掺入聚合物中是提高聚合物晶体管器件性能的可行方法。