Semiconductor Test Capacitor for Non-Destructive Defect Detection
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Solution Overview
Problem
Complex and reduced-sized semiconductor IC structures are prone to defects or physical damage, leading to malfunctions and changes in electrical properties, which hinder high yield rates in manufacturing due to the challenge of continuous monitoring and identification of production issues.
Innovation Solution
A method for manufacturing semiconductor devices involves forming a capacitor structure under a passivation layer proximal to a heterogeneous interface, electrically connecting it to a conductive terminal, and probing the terminal to measure humidity permeability, thereby detecting potential cracks or defects non-destructively before packaging.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If semiconductor IC structures are made complex and reduced-sized to advance technology generations, then circuit integration and functionality are improved, but the structure becomes more prone to defects and physical damage
Solution Approach 1:
The patent applies preliminary action by forming test capacitors and conducting defect detection measurements before the semiconductor device is packaged and shipped. This allows defects to be identified and accounted for in advance, enabling yield optimization without compromising the integrity of the advanced, complex IC structures.
Solution Approach 2:
The patent introduces an intermediary measurement structure (test capacitor) that mediates between the complex IC structure and the defect detection process. The test capacitor serves as a proxy to detect defects indirectly through electrical parameter measurements, avoiding direct interference with the complex IC structure while still enabling reliability assessment.
2Reliability
If continuous monitoring and identification of production problems is implemented to improve yield rate, then manufacturing quality is improved, but the process complexity and time requirements increase
Solution Approach 1:
The patent extracts the defect detection function from the main IC structure by implementing it in a separate, dedicated test capacitor. This allows continuous monitoring to be performed independently without adding complexity to the core IC design, enabling yield improvement while maintaining manufacturing process simplicity.
Solution Approach 2:
The test capacitor structure is designed to be self-testing through electrical parameter measurements. The structure automatically indicates its own integrity status through measurable electrical characteristics, eliminating the need for complex external monitoring equipment or procedures while maintaining continuous quality assessment.
3Productivity
If non-destructive defect detection is performed before packaging to improve product yield, then manufacturing efficiency is improved, but the measurement precision requirements increase
Solution Approach 1:
The patent applies local quality by designing the test capacitor with specific local characteristics optimized for defect detection. The capacitor's electrical parameters are deliberately configured to be highly sensitive to defects in the heterogeneous interface region, enabling precise defect detection without requiring excessive measurement complexity while maintaining high manufacturing efficiency.
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
This method allows for the detection of defects and improvement in product yield by measuring electrical parameters such as leakage current or resonant frequency, ensuring the semiconductor structure's integrity and reliability.
Implementation Method 1
probing the terminal to measure an electrical parameter of the capacitor structure covered by the passivation, wherein the electrical parameter corresponds to a humidity permeability at the heterogeneous interface
Data Source
AI summary
A method of manufacturing a semiconductor structure is provided. The method includes: providing a substrate including an electrical component; forming a capacitor structure in the substrate, proximal to a heterogeneous interface of the substrate, and physically and electrically isolated from the electrical component; forming a conductive terminal over and electrically connected with the capacitor structure; and contacting the conductive terminal with a probe to measure an electrical parameter of the capacitor structure, wherein the electrical parameter corresponds to a humidity permeability at the heterogeneous interface. A semiconductor structure thereof is also provided.