HEMT Gate Layout With Inactive Blocks for ESD Robustness
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Solution Overview
Problem
High-electron-mobility transistors face reliability issues due to gate failures in both ON and OFF states, as well as susceptibility to electrostatic discharge, which existing structures fail to adequately address.
Innovation Solution
Incorporating one or more inactive blocks laterally positioned between the gate and ohmic contacts in the high-electron-mobility transistor structure, which increases Gate-Source and Gate-Drain resistance to reduce current flow and enhance robustness against electrostatic discharge.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the gate structure is simplified for ease of manufacture, then manufacturing precision may be compromised, but gate reliability and protection against electrostatic discharge deteriorate
Solution Approach 1:
The gate structure is segmented into multiple components: the main gate electrode, inactive blocks positioned laterally between the gate and ohmic contacts, and gate dielectric layers. This segmentation allows each component to be optimized independently - the inactive blocks can be specifically designed to increase Gate-Source and Gate-Drain resistance without complicating the overall manufacturing process
Solution Approach 2:
Inactive blocks serve as intermediary elements between the gate and ohmic contacts. These blocks increase the resistance path for gate current, acting as a protective mediator that limits current flow during electrostatic discharge events while maintaining normal transistor operation
2Reliability
If inactive blocks are added to increase Gate-Source and Gate-Drain resistance, then gate leakage is reduced and reliability is improved, but device complexity increases
Solution Approach 1:
The inactive blocks are merged with the existing gate structure fabrication process. They are formed using the same epitaxial growth steps and patterning processes as the main gate, allowing multiple functional elements to be created in a single manufacturing flow without significantly increasing device complexity
Solution Approach 2:
The inactive blocks serve multiple functions simultaneously: they increase Gate-Source and Gate-Drain resistance to reduce gate leakage, provide protection against electrostatic discharge, and can be integrated into the standard heterojunction field effect transistor structure without requiring separate processing steps
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 added inactive blocks effectively lower gate leakage and improve the transistor's reliability by restricting gate current, while maintaining the integrity of the two-dimensional electron gas and source/drain current resistance.
Implementation Method 1
During operation, a two-dimensional electron gas is formed near an interface at the heterojunction and defines the channel of the high-electron-mobility transistor
Implementation Method 2
one or more inactive blocks laterally positioned between the gate and the ohmic contact
Data Source
AI summary
Structures for a high-electron-mobility transistor and methods of forming such structures. The structure comprises a device structure including a gate and an ohmic contact, and one or more inactive blocks laterally positioned between the gate and the ohmic contact.