GaN HEMT n-type Doping Shields 2DEG from Traps
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Solution Overview
Problem
GaN FETs face instabilities due to traps in semiconductor layers below the two-dimensional electron gas, leading to undesirable operational instabilities.
Innovation Solution
Incorporating n-type doping in III-N semiconductor layers below the two-dimensional electron gas to shield it from trapped changes and image charges, with a sheet charge carrier density that effectively screens these issues.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If n-type doping is added to III-N semiconductor layers below the two-dimensional electron gas, then the two-dimensional electron gas is shielded from trapped charges and image charges, but the device structure becomes more complex
Solution Approach 1:
An n-type doped III-N semiconductor layer is introduced as an intermediary between the two-dimensional electron gas and the underlying semiconductor layers containing traps. This intermediary layer with sheet charge carrier density shields the two-dimensional electron gas from trapped charges and image charges, resolving the stability issue without requiring modification of the two-dimensional electron gas itself
Solution Approach 2:
The patent modifies the electrical parameters of the III-N semiconductor layer by introducing n-type doping with specific sheet charge carrier density. This parameter change creates a shielding effect that stabilizes the two-dimensional electron gas while maintaining the overall device structure
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 approach stabilizes the two-dimensional electron gas, reducing operational instabilities and enhancing the performance of GaN FETs by shielding them from trapped charges and image charges.
Implementation Method 1
A sheet charge carrier density of the n-type doping shields the two-dimensional electron gas from trapped charges and image charges below the two-dimensional electron gas
Data Source
AI summary
A semiconductor device containing a GaN FET has n-type doping in at least one III-N semiconductor layer of a low-defect layer and an electrical isolation layer below a barrier layer. A sheet charge carrier density of the n-type doping is 1 percent to 200 percent of a sheet charge carrier density of the two-dimensional electron gas.