Biased HEMT Field Plates for Electric Field Peak Reduction
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Solution Overview
Problem
Conventional high electron mobility transistors (HEMTs) face issues with large electric field peaks near the drain terminal, leading to rapid degradation and performance limitations, especially when zero voltage is applied to the field plates.
Innovation Solution
Applying a non-zero voltage, such as a constant DC voltage or a dynamically controlled voltage, to the field plates of HEMTs to regulate and reduce the electric field profile, allowing for smaller transistor design and increased voltage handling capabilities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If zero-voltage field plates are used to reduce electric field peaks, then electric field magnitude is reduced, but transistor size cannot be reduced and voltage handling capacity is limited
Solution Approach 1:
The patent changes the voltage parameter applied to the field plate from zero (conventional) to a non-zero bias voltage. This parameter change allows the field plate to actively control and reduce electric field peaks in the semiconductor channel region while enabling the transistor to handle higher voltages and potentially reduce in size, thereby resolving the limitation of conventional zero-voltage field plates
2Power
If higher voltage differences are applied between gate and drain terminals to increase voltage handling, then voltage handling capacity increases, but electric field peaks increase causing degradation and leakage
Solution Approach 1:
The field plate acts as an intermediary element between the gate terminal and drain terminal. By applying a non-zero bias voltage to this intermediary structure, the patent enables better control over the electric field distribution, allowing higher voltage handling between gate and drain while the field plate mediates to prevent excessive electric field peaks that would cause degradation and leakage
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 application of a non-zero voltage to the field plates effectively reduces electric field peaks, enhancing HEMT performance, enabling smaller transistor designs and higher operating voltages while maintaining performance margins.
Implementation Method 1
Voltage on the gate terminal generates a field that affects whether the semiconductor channel region conducts current—hence the term 'field-effect transistor'. The field plates help to reduce electric field peaks that would have existed on the drain side of the gate terminal
Data Source
AI summary
The biasing of one or more field plates of a high electron mobility transistor (a HEMT) with a non-zero voltage to thereby affect the electric field profile of the HEMT. The non-zero voltage may be a constant DC voltage, or perhaps may be a voltage that changes over time. The use of a non-zero voltage allows for greater ability to regulate and reduce the electric field occurring in the semiconductor channel region, especially at the field plate. Further, when the electric field occurring at the field plate is reduced, the overall size of the HEMT can also be reduced as compared to applying a zero voltage to the field plate. Alternatively, or in addition, applying a non-zero voltage to the field plate allows the voltage levels handled by the HEMT to be increased as compared to simply grounding the field plate.