Capacitive Crack Detection in Semiconductor Chips
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Solution Overview
Problem
Conventional methods for detecting cracks in semiconductor chips are unreliable and time-consuming, leading to undetected cracks that can cause malfunction or failure, especially during processing and operation.
Innovation Solution
A semiconductor chip with a capacitive structure that includes a first electrode region extending from the top surface to the bottom surface and an electrically insulating region between two electrode regions, which surrounds the semiconductor body and detects crack propagation by measuring changes in electrical properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional methods or sensors are used for crack detection, then the detection process is simple to implement, but the reliability of crack detection is limited and time-consuming
Solution Approach 1:
The patent replaces conventional mechanical or optical crack detection methods with an electrical field-based capacitive sensing system. The capacitive structure detects cracks through changes in electrical properties (capacitance, conductance, impedance) caused by crack-induced material property changes, eliminating the need for time-consuming visual inspection or mechanical probing while significantly improving detection reliability.
Solution Approach 2:
The patent utilizes changes in electrical parameters (capacitance, conductance, impedance) of the capacitive structure as cracks propagate through the semiconductor chip. By monitoring these parameter changes in real-time, the system achieves rapid and reliable crack detection without requiring extensive processing time associated with conventional methods.
2Reliability
If conventional crack detection methods are used, then the implementation is straightforward, but cracks may remain undetected leading to chip failure
Solution Approach 1:
The capacitive structure serves multiple functions: it acts as both a functional element of the semiconductor device and a crack detection sensor. This multi-functionality allows the system to achieve high detection reliability without adding separate dedicated sensing components, thereby limiting the increase in overall device complexity.
Solution Approach 2:
The patent introduces an electrically insulating region as an intermediary between the first and second electrode regions. This intermediary layer enables the capacitive sensing mechanism while electrically isolating the electrodes, allowing reliable crack detection through capacitance changes without requiring direct electrical contact that would complicate the device structure.
3Measurement precision
If the capacitive structure extends fully from first surface to second surface, then crack detection coverage is maximized, but the device complexity increases
Solution Approach 1:
The patent extends the capacitive structure in the vertical dimension from the first surface through to the second surface of the semiconductor chip. This three-dimensional configuration maximizes crack detection coverage by intercepting cracks regardless of their propagation depth or orientation, while the planar arrangement of electrode regions minimizes the lateral footprint and overall structural complexity.
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 capacitive structure effectively detects crack propagation, potentially eliminating the need for stress tests and ensuring reliable operation by identifying cracks before they impair the chip's functionality.
Implementation Method 1
a capacitive structure for detecting crack propagation into the semiconductor body region; wherein the capacitive structure may include a first electrode region at least partially surrounding the semiconductor body region
Implementation Method 2
an electrically insulating region extending between the first electrode region and the second electrode region
Data Source
AI summary
According to various embodiments, a semiconductor chip may include: a semiconductor body region including a first surface and a second surface opposite the first surface; a capacitive structure for detecting crack propagation into the semiconductor body region; wherein the capacitive structure may include a first electrode region at least partially surrounding the semiconductor body region and at least substantially extending from the first surface to the second surface; wherein the capacitive structure further may include a second electrode region disposed next to the first electrode region and an electrically insulating region extending between the first electrode region and the second electrode region.