偏置电位和尺寸对植入式设备电容器电化学迁移的影响

IF 6.6 2区 材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY npj Materials Degradation Pub Date : 2024-03-04 DOI:10.1038/s41529-024-00440-2
Shiyao Du, Feng Li, Flemming Bjerg Grumsen, Rajan Ambat, Ao Tang, Ying Li
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引用次数: 0

摘要

电化学迁移(ECM)引起的枝晶形成是印刷电路板(PCB)上常见的可靠性问题,严重威胁着当前植入式电子设备(IED)的长期安全运行。尽管有几个因素(即污染、湿度、温度)被证明是与气候环境下印刷电路板上电容器的 ECM 易感性密切相关的参数,但由于 ECM 与环境高度相关,因此仍需在其他环境下开展进一步的针对性研究。本文使用人体植入环境下测试 PCB 上的各种尺寸电容器,系统研究了偏置电位和间距尺寸对 ECM 灵敏度的影响。有限元法首先证明,与其他波形相比,直流电压模式可视为加速测试。随后使用直流电位进行的时变测试进一步表明,在低偏置电位下,树枝状晶粒的形成与间距尺寸密切相关,而在高偏置电位下,电场也是印刷电路板上电容器树枝状晶粒形成的主要因素。利用电化学阻抗光谱(EIS)技术,还详细评估了电容器在不同腐蚀状态下的可靠性。这项工作在电子腐蚀机理和未来可靠 IED 的合理设计方面都具有重要价值。
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Effect of bias potential and dimension on electrochemical migration of capacitors for implantable devices
Dendrite formation induced by electrochemical migration (ECM) is a common reliability problem occurring on printed circuit boards (PCBs), which significantly threatens the long-term safe operations of current implantable electronic devices (IEDs). Although several factors (i.e., contaminations, humidity, temperature) are proved to be the parameters closely related to ECM susceptibility of capacitors on a PCB under climate environments, further targeted research under other environments still needs to be conducted as ECM is highly environmental-dependent. Herein, the effects of bias potential and pitch dimension on ECM sensitivity are systematically studied using various sizes of capacitors on a test PCB under a human implantation environment. The finite element method first proves that a DC voltage pattern could be regarded as an accelerated test compared to other waveforms. Subsequent chronoamperometry tests using the DC potential further indicate that dendrite formation is closely related to pitch dimension under low bias potential, while under high bias potential electric field is also the dominating factor of dendrite formation for capacitors on a PCB. Benefiting from the electrochemical impedance spectroscopy (EIS) technique, the capacitor reliability under different corrosion states is also evaluated in a detailed manner. This work offers great value both in electronic corrosion mechanisms and future rational design for reliable IEDs.
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来源期刊
npj Materials Degradation
npj Materials Degradation MATERIALS SCIENCE, MULTIDISCIPLINARY-
CiteScore
7.80
自引率
7.80%
发文量
86
审稿时长
6 weeks
期刊介绍: npj Materials Degradation considers basic and applied research that explores all aspects of the degradation of metallic and non-metallic materials. The journal broadly defines ‘materials degradation’ as a reduction in the ability of a material to perform its task in-service as a result of environmental exposure. The journal covers a broad range of topics including but not limited to: -Degradation of metals, glasses, minerals, polymers, ceramics, cements and composites in natural and engineered environments, as a result of various stimuli -Computational and experimental studies of degradation mechanisms and kinetics -Characterization of degradation by traditional and emerging techniques -New approaches and technologies for enhancing resistance to degradation -Inspection and monitoring techniques for materials in-service, such as sensing technologies
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