Semiconductor Superjunction Layer Stack Doping Optimization
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current semiconductor devices face challenges in achieving high breakdown voltage while maintaining efficient current flow and voltage blocking capabilities, particularly in superjunction transistor arrangements where the balance between drift and compensation regions is critical for on-resistance and voltage blocking performance.
Innovation Solution
The semiconductor device incorporates a layer stack with alternating first and second semiconductor layers of complementary doping types, along with strategically arranged semiconductor regions and carrier regions, to optimize doping concentrations and layer widths between the source, drain, and gate regions, enhancing the breakdown voltage and voltage blocking capabilities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the drift region and compensation region are configured to achieve high breakdown voltage, then the voltage blocking capability is improved, but the on-resistance increases
Solution Approach 1:
The drift region is divided into multiple alternating layers with different doping types (first semiconductor layers and second semiconductor layers), creating a segmented structure that allows independent optimization of each layer's doping concentration and thickness to balance breakdown voltage and on-resistance
Solution Approach 2:
Different regions of the semiconductor device have different doping concentrations - the drift region has lower doping concentration for high breakdown voltage, while the compensation region has higher doping concentration for low on-resistance, achieving local optimization of electrical properties
2Reliability
If the doping concentration in the drift region is increased to reduce on-resistance, then the on-state current flow is improved, but the breakdown voltage decreases
Solution Approach 1:
The drift region is segmented into multiple thin alternating layers, allowing the total doping dose to be distributed across layers. This enables achieving low on-resistance through cumulative doping effect while maintaining high breakdown voltage through the layered structure and depletion region expansion
Solution Approach 2:
The semiconductor device uses a composite structure with alternating layers of different doping types (n-type and p-type), creating a superjunction configuration that combines the benefits of both doping types to achieve superior electrical characteristics compared to single-type doping
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
This configuration effectively increases the breakdown voltage and maintains low on-resistance by balancing doping concentrations and layer widths, improving the overall performance of the semiconductor device in both on-state and off-state operations.
Implementation Method 1
in the off-state (switched off state) a depletion region expands in the drift region and the compensation region that prevents a current flow through the drift region
Implementation Method 2
An average doping concentration along a shortest path between the first semiconductor region and the third semiconductor region in either at least one of the first semiconductor layers, or in at least one of the second semiconductor layers in the first region differs from an average doping concentration along a shortest path between the first semiconductor region and the third semiconductor region of the same layer in the second region
Data Source
AI summary
A semiconductor device includes a layer stack with first semiconductor layers and second semiconductor layers of opposite doping types arranged alternatingly. A first semiconductor region of a first semiconductor device adjoins the first semiconductor layers, and has a first end arranged in a first region of the first semiconductor device and extends from the first end into a second region of the first semiconductor device. Second semiconductor regions of the first semiconductor device adjoin at least one of the second semiconductor layers. A third semiconductor region of the first semiconductor device adjoins the first semiconductor layers. The first semiconductor region extends from the first region into the second region and is spaced apart from the third semiconductor region. The second semiconductor regions are arranged between, and spaced apart from, the third and first semiconductor regions. An average doping concentration along a shortest path between the first and third semiconductor regions in at least one of the first or second semiconductor layers in the first region differs from an average doping concentration along a shortest path between the first and third semiconductor regions of the same layer in the second region.