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Self-healing solid tantalum electrolytic capacitors with low ESR, high-frequency performance, and simple fabrication

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Abstract

This study aims to develop a novel self-healing polymer tantalum electrolytic capacitor with low equivalent series resistance (ESR), high-frequency performance, and a simple preparation method. The capacitor was designed based on a Metal/Insulator/Conductive Polymer/Metal structure, where a copper layer was electroplated onto the surface of PEDOT polymer tantalum electrolytic capacitors (P-PTECs). The effect of electroplating conditions on the electrical properties of the tantalum electrolytic capacitors (TECs) was comprehensively studied. The results demonstrated that incorporating a copper metal layer into the structure of the capacitors significantly reduced the ESR of TECs. By employing an electroplating voltage of 2 V, a current density of 2 A/dm2, and a plating time of 5 min, the ESR of the capacitor was minimized to 27 mΩ. Moreover, the Dissipation Factor (DF) of the capacitor was also enhanced. The utilization of a conductive polymer as the cathode layer provided the capacitors with self-healing characteristics that significantly decreased the leakage current (LC) in the capacitor. Furthermore, the Metal/Insulator/Conductive Polymer/Metal structure fabrication method provided an inventive solution for incorporating thin-film tantalum electrolytic capacitors onto active silicon substrates, opening up possibilities for future ultra-thin and high-density capacitor integration.

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Data availability

The datasets generated during and/or analyzed during the current study are available from the corresponding author on reasonable request.

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Acknowledgements

This work was supported by the National Natural Science Foundation of China (Grant NO. 52173236), and the Sichuan Science and Technology Program (NO.2023NSFSC0410).

Funding

This work was supported by the National Natural Science Foundation of China (Grant No. 52173236), and the Sichuan Science and Technology Program (No. 2023NSFSC0410).

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Authors and Affiliations

  1. School of Materials and Energy, University of Electronic Science and Technology of China, Chengdu, 611731, Sichuan, People’s Republic of China

    Huan Yong, Jing-xin Ji, Meng-meng Zhang, Zhe-sheng Feng & Yan Wang

  2. Department of Dermatology, West China Hospital, Sichuan University, Chengdu, 610041, China

    Kai-wen Zhuang

  3. School of Surveying and Geographic Information, Sichuan Water Conservancy College, Chengdu, 611231, China

    Yong Wu

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  1. Huan Yong
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Contributions

Material preparation, data collection and analysis were performed by HY, JJ and YW. The first draft of the manuscript was written by HY. Project administration, conceptualization and formal analysis were performed by ZF and YW. Visualization, Investigation and Methodology were performed by HY, YW, KZ, JJ and MZ. All authors read and approved the final manuscript.

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Correspondence to Kai-wen Zhuang, Zhe-sheng Feng or Yan Wang.

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Yong, H., Wu, Y., Zhuang, Kw. et al. Self-healing solid tantalum electrolytic capacitors with low ESR, high-frequency performance, and simple fabrication. J Mater Sci: Mater Electron 34, 1228 (2023). https://doi.org/10.1007/s10854-023-10663-9

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