Schottky Barrier Diode Composition Change Layer Trade-off
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Solution Overview
Problem
There is a trade-off between pressure resistance and on-state resistance in semiconductor devices, particularly in Schottky barrier diodes, making it difficult to achieve high performance due to the physical properties of semiconductor layers such as permittivity, mobility, and insulation breakdown electric field.
Innovation Solution
Incorporating a composition change layer with a negative polarization charge and donor impurity in the semiconductor device, where the composition changes from the cathode to the anode, allowing for voltage application perpendicular to the principal surface, which relieves electric field concentration and improves the trade-off between pressure resistance and on-state resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the pressure resistance of the semiconductor device is increased, then the pressure resistance is improved, but the on-state resistance is also increased
Solution Approach 1:
The patent applies local quality by creating a composition change layer with graded composition (AlGaAs layer with varying Al content) in the semiconductor structure. This localized compositional variation generates polarization charges that specifically modify the electric field distribution in the depletion region, thereby improving pressure resistance without significantly increasing on-state resistance. The graded composition allows different regions to have different properties: the composition change layer provides high breakdown voltage, while the doped regions maintain low on-state resistance.
Solution Approach 2:
The patent employs parameter changes by systematically varying the composition parameters of the semiconductor layers. Specifically, the Al content in the AlGaAs composition change layer is gradually modified from 0% to 30%, creating a graded structure. This compositional parameter change generates controlled polarization effects that enhance the electric field distribution, allowing the device to achieve higher pressure resistance while maintaining acceptable on-state resistance characteristics.
2Object-affected harmful factors
If the on-state resistance is decreased, then the on-state resistance is improved, but the pressure resistance is also decreased
Solution Approach 1:
The patent applies local quality by creating a composition change layer with graded composition (AlGaAs layer with varying Al content). This localized compositional variation generates polarization charges that specifically modify the electric field distribution in the depletion region, thereby improving pressure resistance without significantly increasing on-state resistance. The graded composition allows different regions to have different properties: the composition change layer provides high breakdown voltage, while the doped regions maintain low on-state resistance.
Solution Approach 2:
The patent employs parameter changes by systematically varying the composition parameters of the semiconductor layers. Specifically, the Al content in the AlGaAs composition change layer is gradually modified from 0% to 30%, creating a graded structure. This compositional parameter change generates controlled polarization effects that enhance the electric field distribution, allowing the device to achieve higher pressure resistance while maintaining acceptable on-state resistance characteristics.
3Reliability
If the composition change layer with negative polarization charge is added, then the trade-off between pressure resistance and on-state resistance is improved, but the device complexity is increased
Solution Approach 1:
The patent applies merging by combining multiple functions into the composition change layer. The AlGaAs graded layer simultaneously serves as: (1) a polarization charge generation layer, (2) a transition layer between different composition regions, and (3) part of the depletion region structure. This integration reduces the need for separate layers and simplifies the overall device structure while achieving the desired electrical characteristics.
Solution Approach 2:
The patent employs composite materials by creating a heterostructure with AlGaAs composition change layer combined with GaAs doped layers. The composite structure leverages the different properties of each material layer: the AlGaAs graded composition provides polarization effects for high breakdown voltage, while the GaAs doped regions provide high carrier concentration for low on-state resistance. This material composition strategy achieves superior electrical performance without proportionally increasing structural complexity.
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 enables a semiconductor device with improved trade-off between pressure resistance and on-state resistance, achieving high pressure resistance and low on-state resistance, beyond the physical limits of conventional devices.
Implementation Method 1
the composition change layer has composition that changes from a cathode electrode side toward an anode electrode side in the direction perpendicular to the principal surface of the composition change layer, has a negative polarization charge that is generated due to the composition that changes
Data Source
AI summary
A semiconductor device includes semiconductor layers, an anode electrode, and a cathode electrode. The semiconductor layers include a composition change layer, the anode electrode is electrically connected to one of principal surfaces of the composition change layer through a formation of a Schottky junction between the anode electrode and a part of the semiconductor layers, the cathode electrode is electrically connected to the other of the principal surfaces of the composition change layer through a formation of a junction between the cathode electrode and another part of the semiconductor layers, the anode electrode and the cathode electrode are capable of applying a voltage to the composition change layer in a direction perpendicular to the principal surface.