Semiconductor Layer Stack With Continuous Space Charge Insulation
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Solution Overview
Problem
Semiconductor layer stacks with high residual conductivity due to deep impurities and dopants positioned far from the center of the energy gap, leading to limited power capability and restricted application areas, as they result in high sheet resistance and leakage currents.
Innovation Solution
A semiconductor layer stack with alternating layers, each having a specific energy position of the Fermi level within the band gap, forming a continuous space charge zone region to achieve a Fermi level position near the center of the energy gap, thereby reducing charge carrier concentration and enhancing insulation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If deep impurities or dopants positioned far from the center of the energy gap are used, then doping is easier to control and sufficient insulating effect is achieved, but residual conductivity remains high and sheet resistance is limited
Solution Approach 1:
The patent divides the semiconductor layer into multiple alternating layers with different doping types (n-type and p-type) positioned at different depths. This segmentation creates multiple space charge zones that collectively achieve better insulation while maintaining manufacturing control. Each layer can be doped independently with standard dopants, avoiding the need for difficult-to-control single dopant placement near the band gap center.
2Ease of manufacture
If a single dopant is used, then the insulating effect is sufficient and process control is easier, but the Fermi level cannot be positioned near the center of the energy gap, resulting in high residual conductivity
Solution Approach 1:
The patent applies different doping types (n-type and p-type) at different local positions (depths) within the semiconductor layer. This local differentiation creates alternating space charge zones that collectively pin the Fermi level near the band gap center, reducing leakage current while maintaining ease of manufacturing through standard doping techniques applied locally to each layer.
3Reliability
If deep impurities are used to achieve high resistivity, then insulation is improved, but the Fermi level is pinned far from the center of the band gap, resulting in sheet resistance more than 10 orders of magnitude below theoretical maximum
Solution Approach 1:
The patent transitions from a single-layer approach to a multi-layer vertical structure, adding the depth dimension to Fermi level positioning. By controlling the depth, thickness, and doping type of multiple alternating layers, the invention achieves Fermi level pinning near the band gap center through the cumulative effect of multiple space charge zones, rather than relying on a single impurity level position.
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 alternating layer structure effectively reduces charge carrier concentration, achieving higher sheet resistance and improved insulation, allowing for better power handling and expanded application areas of semiconductor components.
Implementation Method 1
the thickness of the layers being selected such that a continuous space charge zone region over the layers results
Data Source
AI summary
A semiconductor layer stack, a component made therefrom, a component module, and a production method is provided. The semiconductor layer stack has at least two layers (A, B), which, as individual layers, each have an energy position of the Fermi level in the semiconductor band gap,EF-EV<EG2applying to the layer (A) andEL-EF<EG2applying to the layer (B), with EF the energy position of the Fermi level, EV the energy position of the valence band, EL the energy position of a conduction band and EL−EV the energy difference of the semiconductor band gap EG, the thickness of the layers (A, B) being selected in such a way that a continuous space charge zone region over the layers (A, B) results.