Embedded Acoustic Sensors for Flip-Chip Underfill Failure Detection
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Solution Overview
Problem
Current methods for detecting failure in flip-chip modules, such as delamination and crack propagation, are destructive, time-consuming, and expensive, failing to provide early detection or meaningful granularity for analysis, and rely heavily on model assumptions.
Innovation Solution
A non-destructive method involving sensors embedded in the underfill material of flip-chip modules to measure acoustic impedance, allowing for real-time monitoring and imaging of chip-packaging interaction failures, enabling early detection of crack propagation and mitigating catastrophic failures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If destructive physical failure analysis methods are used, then failure detection capability is improved, but the flip-chip module is destroyed and cannot be reused
Solution Approach 1:
The patent replaces destructive mechanical analysis methods with non-destructive acoustic microscopy. The acoustic microscope uses sound waves to image the interior of the flip-chip module, allowing failure detection without physical destruction of the module. This substitution enables both high measurement precision for failure detection and preservation of module reusability.
2Measurement precision
If conventional failure analysis methods are used, then failure detection is achieved, but the process is time-consuming and expensive
Solution Approach 1:
The patent incorporates acoustic microscopy capability into the packaging process itself, allowing failure analysis to be performed preliminarily during manufacturing rather than as a separate post-processing step. This integration enables real-time monitoring and immediate detection of failures, dramatically reducing the time and cost associated with conventional retrospective failure analysis.
3Ease of manufacture
If model assumptions are used for failure prediction, then analysis cost is reduced, but detection accuracy deteriorates
Solution Approach 1:
The patent replaces model-based predictive analysis with direct acoustic imaging measurement. Instead of relying on computational models and assumptions to predict failure, the acoustic microscope provides direct visual evidence of actual failures in the module. This substitution maintains low analysis costs while dramatically improving detection accuracy by showing real failure conditions rather than predicted ones.
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
Enables early detection of non-critical failures, reduces the need for destructive analysis, provides continuous in-situ monitoring, and offers advanced warning of field failures, allowing for service with minimal customer impact and business interruption, while reducing costs associated with reliability studies.
Implementation Method 1
sensors embedded in the underfill material of flip-chip modules to measure acoustic impedance
Data Source
AI summary
A method includes forming a flip-chip module including a chip connected to a substrate with a layer of underfill material adhered to the chip and the substrate; sensing chip-packaging interaction failure in the underfilled flip-chip module in situ; reporting in-situ chip-packaging interaction failure to a device in real-time; and imaging the chip-packaging interaction failure with an indirect scanning acoustic microscope.