HEMT Field Plate Structure for Uniform High-Voltage Gain
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Solution Overview
Problem
Existing HEMT transistors face challenges in achieving high gain and uniform electric field distribution when high voltages are applied, particularly due to susceptibility in frequency response and switching capacities.
Innovation Solution
The introduction of first and second field plate regions, made of conductive material, which are strategically positioned to modify the electric field and enhance gain by acting as a shield between the gate and drain regions during high voltage applications.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If a conventional HEMT transistor structure is used, then the device can operate at high voltages, but the gain is insufficient and electric field distribution is non-uniform when high voltages are applied
Solution Approach 1:
A field plate structure is introduced as an intermediary element between the gate and drain regions. This field plate, extending laterally from the gate region over the insulating layer, acts as a mediator that redistributes the electric field lines, creating a more uniform electric field distribution in the high voltage region while maintaining high gain through enhanced field control
2Strength
If high voltage is applied to the HEMT transistor, then the breakdown voltage capability is achieved, but the frequency response and switching capacities become susceptible
Solution Approach 1:
The field plate structure extends the gate control into a lateral dimension beyond the conventional vertical gate structure. By extending the field plate laterally over the insulating layer towards the drain region, the electric field control is projected into an additional spatial dimension, enabling improved frequency response and switching characteristics while maintaining high voltage breakdown capability
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 implementation of field plate regions significantly increases the gain of the HEMT transistor and ensures a more uniform electric field, thereby improving the transistor's performance at high frequencies and high voltages.
Implementation Method 1
The field plate regions, made of conductive material, which are strategically positioned to modify the electric field and enhance gain by acting as a shield between the gate and drain regions during high voltage applications
Implementation Method 2
each HEMT transistor comprises a gate region; the HEMT transistor channel is modulated by the voltage on the gate region
Data Source
AI summary
An HEMT transistor includes a semiconductor body having a semiconductive heterostructure. A gate region, of conductive material, is arranged above and in contact with the semiconductor body. A first insulating layer extends over the semiconductor body, laterally to the conductive gate region. A second insulating layer extends over the first insulating layer and the gate region. A first field plate region, of conductive material, extends between the first and the second insulating layers, laterally spaced from the conductive gate region along a first direction. A second field plate region, of conductive material, extends over the second insulating layer, and the second field plate region overlies and is vertically aligned with the first field plate region.