Semiconductor Defect Inspection Using Gate-Switched Drain Potential
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Solution Overview
Problem
Existing semiconductor inspection methods lack efficiency in detecting changes in the state of semiconductor devices, particularly due to low sensitivity in evaluating characteristics like forward voltage, making it difficult to identify defective products effectively.
Innovation Solution
An inspection apparatus and method that involves setting the gate electrode to alternating on- and off-potentials, detecting drain potential values at different stages, and analyzing the difference between these values to assess semiconductor device quality, thereby enhancing sensitivity and efficiency in identifying defective products.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional inspection methods are used to detect semiconductor device defects, then the inspection process is simple, but the sensitivity and detection precision are insufficient
Solution Approach 1:
The inspection process is segmented into multiple distinct operations: initial detection with gate at on-potential, progress operation with gate at off-potential, and final detection with gate at on-potential. This segmentation allows each operation to target specific defect characteristics, improving overall detection sensitivity while maintaining manageable complexity through systematic breakdown of the inspection workflow
Solution Approach 2:
The inspection method employs periodic action by alternating the gate electrode between on-potential and off-potential states across three sequential operations. This periodic variation in gate potential enables dynamic detection of defects that may not be apparent under static conditions, significantly enhancing detection sensitivity through time-varying electrical characteristics measurement
2Reliability
If conventional single-state detection is used, then the inspection process is fast, but the ability to identify defective products is insufficient
Solution Approach 1:
The first operation serves as a preliminary detection step where the gate electrode is set to on-potential and initial drain potential is detected. This preliminary action establishes a baseline state that enables subsequent comparison with the progress operation results, improving defect identification accuracy by providing reference data for anomaly detection
Solution Approach 2:
The inspection method implements feedback by comparing drain potential values across multiple operations with different gate states. The controller analyzes the differences between detection results from the initial operation, progress operation, and final operation to identify defects, creating a feedback loop that continuously refines defect identification accuracy through multi-state comparison
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 method provides high-sensitivity and efficient detection of semiconductor device defects by analyzing the difference in drain potential values, improving the overall inspection process.
Implementation Method 1
the transistor section includes a source electrode, a drain electrode, and a gate electrode
Implementation Method 2
the current source is configured to supply a first current to the drain electrode in a direction from the drain electrode to the source electrode
Data Source
AI summary
According to one embodiment, an inspection apparatus includes a controller configured to be electrically connected to a semiconductor device. The semiconductor device includes a semiconductor member, a transistor section, and a diode section. The transistor section and the diode section are provided in the semiconductor member. The transistor section includes a source electrode, a drain electrode, and a gate electrode. The diode section includes a first end and a second end. The first end is electrically connected to the source electrode. The second end is electrically connected to the drain electrode. The controller is configured to perform a first operation, a first progress operation, a second operation, and a first determination operation. The first progress operation is performed after the first operation. The second operation is performed after the first progress operation.