Conductive Polymer Capacitor Layer for Humidity-Stable Capacitance
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Solution Overview
Problem
Current solid electrolyte aluminum electrolytic capacitors face issues with capacitance reduction due to self-healing mechanisms inadequately addressing subtle defects and hydration-induced degradation, leading to ineffective performance in humid environments.
Innovation Solution
Incorporation of anodizing agents and organic solvents in the conductive polymer layer to promote oxide growth and enhance hydration resistance, alongside additives to improve conductivity, forming a layered structure that reforms dielectric layers and maintains capacitance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the conductive polymer uses self-healing mechanism to counteract point defects, then reliability is improved by preventing short circuiting, but capacitance is reduced due to areas of the conductive polymer ceasing to conduct electricity
Solution Approach 1:
The patent modifies the chemical composition parameters of the conductive polymer by incorporating specific additives (carboxylic acids, phenols, or their salts) to enable the polymer to heal subtle defects without losing conductivity, thus maintaining capacitance while improving reliability
Solution Approach 2:
The patent creates a composite conductive polymer material by combining the base conductive polymer with specific functional additives (carboxylic acids, phenols, or their salts), which together provide both self-healing capability for subtle defects and maintained conductivity, resolving the contradiction between reliability improvement and capacitance retention
2Ease of manufacture
If the conductive polymer is hygroscopic and absorbs water from the atmosphere, then ease of manufacture is improved, but the aluminum oxide dielectric layer becomes hydrated causing inferior dielectric properties and increased leakage current
Solution Approach 1:
The patent introduces specific additives (carboxylic acids, phenols, or their salts) as intermediaries that form a protective interface between the hygroscopic conductive polymer and the aluminum oxide dielectric layer, preventing water from reaching and hydrating the dielectric while allowing the polymer to maintain its desirable hygroscopic properties for manufacturing
Solution Approach 2:
The patent changes the chemical composition parameters of the conductive polymer layer by adding specific functional compounds that alter its interaction with water, making it less prone to causing dielectric hydration while maintaining manufacturability
3Reliability
If the self-healing mechanism is used to remove point defects, then reliability is improved, but the mechanism is incapable of removing more subtle defects caused by hydration reactions
Solution Approach 1:
The patent modifies the chemical and functional parameters of the conductive polymer by incorporating specific additives that enable it to address both point defects and subtle hydration-related defects, expanding its adaptability while maintaining reliability improvement
Solution Approach 2:
The patent creates a composite conductive polymer with enhanced functionality that combines the original self-healing capability for point defects with new capability to address subtle hydration defects, thus improving versatility without sacrificing reliability
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution effectively targets and repairs subtle defects, stabilizes dielectric layers against hydration, and maintains capacitance, ensuring superior performance in humid conditions with reduced leakage current and ESR.
Implementation Method 1
The at least one additive may include an anodizing agent to promote oxide growth of the dielectric layer
Implementation Method 2
leakage current from the point defect may cause the conductive polymer to rise past its decomposition temperature such that the local area of the conductive polymer corresponding to that point defect decomposes
Implementation Method 3
water absorption from the atmosphere may cause the conductive polymer to become hydrated over time
Data Source
AI summary
An electrolytic capacitor for a semiconductor device includes a conductive substrate, a dielectric layer on the conductive substrate, and a conductive polymer layer on the dielectric layer. The conductive polymer layer may include at least one additive. The at least one additive may include an anodizing agent to promote oxide growth of the dielectric layer. The at least one additive may instead or additionally include an organic solvent, an additive to promote hydration resistance of the dielectric layer, and/or an additive to increase conductivity of the conductive polymer layer.