Segmented Control Electrode Layout for High-Frequency Semiconductor Switching
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Solution Overview
Problem
Current semiconductor devices face challenges in enhancing high-frequency characteristics, particularly in achieving improved high-frequency breakdown voltage and switching performance.
Innovation Solution
The semiconductor device incorporates a control electrode with subdivided control parts and specific semiconductor region arrangements, including halo regions and extension portions, to optimize the interface between the insulating layer and semiconductor layer, enhancing electrical insulation and switching performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional single-control-electrode structure is used, then the device structure is simple, but the gate capacitance is large and high-frequency breakdown voltage is low
Solution Approach 1:
The control electrode is divided into three separate control parts (first control part, second control part, and third control part) that are electrically insulated from each other by insulating films. This segmentation allows each control part to independently control the channel, reducing the total gate capacitance while maintaining control effectiveness, thereby improving high-frequency breakdown voltage without significantly increasing structural complexity
Solution Approach 2:
Different control parts are positioned at different locations along the channel (first control part at the source side, second control part in the middle, third control part at the drain side). Each control part has locally optimized properties and control characteristics tailored to its specific position, allowing precise control of the channel in different regions while reducing overall capacitance
2Productivity
If a conventional single-control-electrode structure is used, then the manufacturing process is simple, but the switching performance is limited
Solution Approach 1:
The control electrode is segmented into three independently controllable parts, each capable of switching the channel on or off independently. This enables more sophisticated switching modes (e.g., body-diode-blocking mode, reverse-body-diode-blocking mode) that significantly improve switching performance and frequency characteristics
Solution Approach 2:
The three control parts can be dynamically controlled with different voltage levels independently of each other, allowing the device to adapt its switching characteristics in real-time. This dynamic control enables optimization of switching performance for different operating conditions without requiring complex manufacturing processes
3Reliability
If the control electrode is subdivided into multiple parts, then the gate capacitance is reduced and high-frequency breakdown voltage is increased, but the device complexity increases
Solution Approach 1:
The control electrode is divided into three control parts separated by insulating films, which reduces gate capacitance and increases high-frequency breakdown voltage. The segmentation is implemented in a way that maintains reasonable structural complexity by using standard insulating film deposition and patterning techniques
Solution Approach 2:
The invention optimizes parameters such as the thickness of insulating films between control parts, the width and position of each control part, and the doping concentrations to achieve the desired balance between reduced capacitance, increased breakdown voltage, and manageable structural complexity
Data Source
AI summary
A semiconductor device includes an insulating layer, a semiconductor layer and a control electrode. The semiconductor layer is provided on the insulating layer and includes a first semiconductor region of a first conductivity type, a second semiconductor region of the first conductivity type and a third semiconductor region of a second conductivity type. The third semiconductor region is located between the first semiconductor region and the second semiconductor region. The first to third semiconductor regions are arranged in a first direction along an interface between the insulating layer and the semiconductor layer. The control electrode is provided on the semiconductor layer and includes first to third control parts arranged in the first direction. The first control part is located between the second control part and the third control part. The third semiconductor region is positioned between the insulating layer and the first control part.