Abstract Direct-patterned Cu-based conductive electrodes were printed through electrohydodynamic (EHD) jet printing via cone-jet mode. The introduction of a capping agent in the synthesis of the Cu ink limited excessive conductivity, which enabled the pristine Cu ink to achieve the various printing modes of EHD jet printing: dripping, micro-dripping, cone-jet, and multi-jet. We also obtained optimal printing conditions by adjusting the viscosity by adding poly(ethylene oxide) (PEO) to the pristine Cu inks, resulting in well-defined printing patterns. The optimized PEO content in the ink was determined to be ∼10 wt%, which gave us a stable cone-jet mode and well-defined Cu/PEO composite electrode lines with sharp edges. We utilized the Cu/PEO composite electrode lines as source and drain and a triisopropylsilylethynyl (TIPS)–pentacene/PS blend as the active layer for bottom-gate bottom-contact organic field-effect transistors (OFETs). The resulting devices exhibited an average field-effect mobility (μFET), threshold voltage (Vth), and on/off current ratio (Ion/Ioff) of 0.253 cm2/V, 0.253 V, and ∼106, respectively.

中文翻译：

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通过电流体动力学喷射印刷通过锥形喷射模式直接图案化铜/聚（环氧乙烷）复合电极用于有机薄膜晶体管

摘要 通过锥形喷射模式通过电动流体（EHD）喷射印刷印刷直接图案化的铜基导电电极。在铜墨合成中引入封端剂限制了过度的导电性，这使得原始的铜墨能够实现 EHD 喷墨打印的各种打印模式：滴落、微滴落、锥形喷射和多喷射。我们还通过将聚环氧乙烷 (PEO) 添加到原始 Cu 油墨中来调整粘度，从而获得了最佳印刷条件，从而产生了明确的印刷图案。油墨中优化的 PEO 含量确定为~10 wt%，这为我们提供了稳定的锥形喷射模式和清晰边缘的 Cu/PEO 复合电极线。我们利用 Cu/PEO 复合电极线作为源漏和三异丙基甲硅烷基乙炔基 (TIPS)-并五苯/PS 混合物作为底栅底接触有机场效应晶体管 (OFET) 的有源层。所得器件的平均场效应迁移率 (μFET)、阈值电压 (Vth) 和开/关电流比 (Ion/Ioff) 分别为 0.253 cm2/V、0.253 V 和 ~106。