Capacitor Defect Removal via Selective Electrode Segmentation
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Solution Overview
Problem
Decoupling capacitors in electronic devices are prone to defects such as electrical shorts or leakage paths due to manufacturing imperfections, which can render them non-functional, and current methods lack effective solutions for defect removal without exposing the workpiece to additional chemicals or re-depositing layers.
Innovation Solution
A process is developed where defects within the capacitor electrodes are detected and selectively removed, allowing the capacitor to function despite the defects, by forming a first and second electrode layer with an opening that encompasses the defect, thereby preventing electrical shorts and maintaining capacitor functionality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If decoupling capacitors are added to reduce voltage swings, then power supply stability is improved, but the area occupied by the capacitor increases and the device becomes more susceptible to defects
Solution Approach 1:
The capacitor structure is segmented into multiple functional layers (first electrode layer, dielectric layer, second electrode layer) with selective defect removal in specific segments. This segmentation allows the capacitor to maintain overall functionality even when defects are present in certain segments, effectively reducing the impact of defects on the total capacitor area and power supply stability.
Solution Approach 2:
The patent applies local quality by selectively removing portions of the second electrode layer only at defect locations rather than uniformly across the entire capacitor. This localized modification maintains the capacitor's electrical performance in defect-free areas while eliminating harmful effects at defect sites, thereby preserving power supply stability without sacrificing significant capacitor area.
2Reliability
If defects are detected and selectively removed from capacitor electrodes, then electrical short prevention is improved, but additional processing steps are required
Solution Approach 1:
The patent implements preliminary action by detecting defects in the second electrode layer before final capacitor assembly and operation. By identifying and marking defect locations in advance, the subsequent selective removal process can be precisely targeted, ensuring electrical short prevention while minimizing unnecessary processing steps in defect-free areas.
Solution Approach 2:
The patent applies the extraction principle by selectively removing only the defective portions of the second electrode layer, rather than removing entire layers or redesigning the capacitor structure. This targeted extraction eliminates the source of electrical shorts and leakage paths while preserving the functional integrity of the capacitor and minimizing additional processing complexity.
3Manufacturing precision
If the cleanest clean room environment is used, then particle contamination is reduced, but defects cannot be totally prevented
Solution Approach 1:
The patent converts the harmful effect of particles and defects into a benefit by using defect detection and selective removal as a quality assurance mechanism. Rather than relying solely on preventing particle contamination during manufacturing, the process embraces the reality that defects will occur and systematically identifies and eliminates them, thereby transforming an unavoidable manufacturing challenge into a reliable defect mitigation strategy.
Data Source
AI summary
An electronic device can include electronic components and an insulating layer overlying the electronic components. The electronic device can also include a capacitor overlying the insulating layer, wherein the capacitor includes a first electrode and a second electrode. The second electrode can include an opening, wherein from a top view, a defect lies within the opening. In another aspect, a process of forming an electronic device can include forming a first capacitor electrode layer over a substrate, forming a dielectric layer over the first capacitor electrode layer, and forming a second capacitor electrode layer over the dielectric layer. The process can also include detecting a defect and removing a first portion of the second capacitor electrode layer corresponding to the defect, wherein a second portion of the second capacitor electrode layer remains over the dielectric layer.