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首页> 外文期刊>ACS applied materials & interfaces >Overcoming Electrochemical Instabilities of Printed Silver Electrodes in All-Printed Ion Gel Gated Carbon Nanotube Thin-Film Transistors
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Overcoming Electrochemical Instabilities of Printed Silver Electrodes in All-Printed Ion Gel Gated Carbon Nanotube Thin-Film Transistors

机译：全印刷离子凝胶门控碳纳米管薄膜晶体管克服印刷银电极的电化学稳定性

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摘要

Silver ink is the most widely used conductive material for printing electrodes in the fabrication of all-printed ion gel gated transistors because of their high conductivity and low cost. However, electrochemical instability of printed silver electrodes is generally one of the biggest issues, whether it is in air where silver gets oxidized or in a moisture environment where electrochemical migration occurs. Notwithstanding, the electrochemical stability of printed silver electrodes in ion gel medium has not been studied so far. In this work, we studied the electrochemical instabilities of printed silver electrodes in fully printed ion gel gated single-walled carbon nanotube (SWCNT) thin-film transistors (TFTs) and developed some strategies to overcome these issues. All-printed ion gel-based p-type SWCNT TFTs were employed to investigate the impact of electrochemical instabilities on the electrical behavior of printed SWCNT TFTs. The results have demonstrated that printed silver was unstable at anodic and cathodic polarization because of the corrosion by the ionic liquid. Besides, anodic corrosion of silver source/drain electrodes was shown to be responsible for the electrical failure of printed SWCNT TFTs in both the linear and saturated regime. These issues were completely resolved when preventing printed silver electrodes from coming into direct contact with ion gels. For example, ion gels were partially printed in device channels to avoid contacting the printed silver source and drain electrodes. At the same time, silver side-gate electrodes were replaced by inkjet-printed PEDOT:PSS electrodes to avoid gate electrode-related instabilities. Consequently, all-printed electrochemically stable SWCNT TFTs fabricated were obtained with enhanced performance of higher I _(ON)/I _(OFF) ratios (10~(5) to 10~(6)), smaller subthreshold slopes (～70 mV/dec), and smaller hysteresis (ΔV = 0.025 V) at gate voltages from 1.2 to ?0.5 V. Additionally, the polarity of all-printed SWCNT TFTs was converted from the p-channel to ambipolar while achieving lower leakage currents.
机译：银色墨水是用于印刷电极的最广泛使用的导电材料，其由于其高导电性和低成本而制造的制造。然而，印刷银电极的电化学不稳定性通常是最大的问题之一，无论是银在氧化的空气中还是在电化学迁移发生的水分环境中。尽管如此，到目前为止，尚未研究离子凝胶介质中印刷银电极的电化学稳定性。在这项工作中，我们研究了完全印刷离子凝胶门控单壁碳纳米管（SWCNT）薄膜晶体管（TFT）中印刷银电极的电化学稳定性，并开发了一些克服这些问题的策略。采用全印刷的离子凝胶的P型SWCNT TFT来研究电化学不稳定性对印刷SWCNT TFT的电气行为的影响。结果表明，由于离子液体的腐蚀，印刷的银在阳极和阴极极化时不稳定。此外，显示银源/漏极电极的阳极腐蚀，负责线性和饱和状态下印刷SWCNT TFT的电气故障。在防止印刷银电极与离子凝胶直接接触时，这些问题完全解决。例如，在装置通道中部分地印刷离子凝胶，以避免接触印刷的银源和漏电极。同时，通过喷墨印刷的PEDOT代替银侧栅电极：PSS电极以避免栅电极相关的不稳定性。因此，通过增强性能的高度

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