Boron Nitride Gate Insulation for Power Semiconductor Heat Dissipation
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Solution Overview
Problem
Power semiconductor devices face challenges in heat dissipation, particularly at high current density areas, which can lead to self-heating effects and device destruction due to insufficient thermal management.
Innovation Solution
The use of a boron nitride layer as a gate insulation layer in power semiconductor devices, which acts as a heat spreader to efficiently dissipate heat generated at hot spots within the device, improving thermal performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If conventional gate insulation layers are used, then the device structure is simple and easy to manufacture, but heat dissipation is insufficient leading to hot spots and device destruction
Solution Approach 1:
The patent changes the material parameter of the gate insulation layer from conventional materials (such as silicon oxide) to boron nitride, which has superior thermal conductivity. This parameter change enables efficient heat dissipation from high current density areas while maintaining the insulating function, thereby preventing hot spots and device destruction without complicating the device structure
Solution Approach 2:
The patent employs boron nitride as a composite material solution that combines both electrical insulation properties and exceptional thermal conductivity. This composite material approach allows the gate insulation layer to simultaneously provide electrical isolation and thermal management functions, resolving the contradiction between heat dissipation requirements and device reliability
2Temperature
If the gate insulation layer is made of boron nitride, then heat dissipation is improved, but the manufacturing process becomes more complex
Solution Approach 1:
The patent addresses manufacturing complexity by optimizing the deposition parameters and process conditions for boron nitride layer formation. By carefully controlling deposition parameters such as temperature, pressure, and gas flow rates, the patent achieves high-quality boron nitride gate insulation layers with improved thermal performance while keeping the manufacturing process feasible and not excessively complex
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 boron nitride layer effectively conducts heat away from the semiconductor body to the metallization, enhancing heat dissipation and preventing hot spots, thereby improving the reliability and longevity of the power semiconductor device.
Implementation Method 1
The boron nitride layer effectively conducts heat away from the semiconductor body to the metallization, enhancing heat dissipation
Implementation Method 2
acts as a heat spreader to efficiently dissipate heat generated at hot spots within the device
Data Source
AI summary
A power semiconductor device includes: a semiconductor body having a front side and a backside and configured to conduct a load current between the front side and the backside; and a plurality of control cells configured to control the load current. Each control cell is at least partially included in the semiconductor body at the front side and includes a gate electrode that is electrically insulated from the semiconductor body by a gate insulation layer. The gate insulation layer is or includes a first boron nitride layer.