Doped Semiconductor Ring Structure for Die Crack Detection
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Solution Overview
Problem
Conventional semiconductor processes face challenges in detecting micro-cracks, such as hairline cracks, that can form at the edges or corners of semiconductor dies during the singulation process, which can degrade the reliability of the die.
Innovation Solution
A III-V semiconductor die is designed with a device area and a doped semiconductor ring region surrounding the device area, including a substrate, a sub-collector layer, and a protective layer. The ring element, made of a doped semiconductor layer, is formed in the sub-collector layer to detect cracks by measuring changes in electrical resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a cutting process (such as laser cutting) is employed to singulate the dies on a substrate, then the dies can be separated for use, but micro-cracks may form at the edges or corners of the die, degrading the reliability of the die
Solution Approach 1:
The patent applies preliminary action by forming a doped semiconductor ring region around the device area before the singulation process. This ring structure is pre-configured to detect cracks that may form during subsequent cutting operations, allowing for early identification of reliability issues before they affect die performance
Solution Approach 2:
The doped semiconductor ring region acts as an intermediary detection mechanism between the singulation process and the final die product. It serves as a sensor that mediates the detection of micro-cracks formed during cutting, enabling quality control without interfering with the production efficiency
2Reliability
If micro-cracks are detected to ensure die reliability, then the reliability of the die can be improved, but additional detection structures and processes are required, increasing device complexity
Solution Approach 1:
The patent merges the crack detection function with the existing semiconductor structure by integrating the doped semiconductor ring region into the sub-collector layer. This combines the detection functionality with the device fabrication process, eliminating the need for separate detection structures and reducing overall device complexity
Solution Approach 2:
The doped semiconductor ring region serves multiple functions: it acts as part of the device structure (sub-collector layer) and simultaneously functions as a crack detection sensor. This multi-functionality reduces the need for additional components, thereby reducing device complexity while maintaining 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 semiconductor die effectively detects micro-cracks by utilizing the doped semiconductor ring region to measure changes in electrical resistance, thereby enhancing the reliability and integrity of the semiconductor die.
Implementation Method 1
The ring element, made of a doped semiconductor layer, is formed in the sub-collector layer to detect cracks by measuring changes in electrical resistance
Data Source
AI summary
A III-V semiconductor die for die crack detection is provided. The III-V semiconductor die includes a device area. The III-V semiconductor die further includes a doped semiconductor ring region. The doped semiconductor ring region surrounds the device area. At least one active device or at least one passive device is formed in the device area of the III-V semiconductor die.