Group III-Nitride Silicon Controlled Rectifier for Compact ESD Protection
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Solution Overview
Problem
Group III-Nitride (III-N) diodes with low on-resistance tend to be area-intensive, making them challenging for dimensional scaling in integrated circuits, which necessitates the development of more compact III-N heterojunction silicon controlled rectifier (SCR) structures for effective ESD protection and high breakdown voltages.
Innovation Solution
The implementation of III-N heterojunction silicon controlled rectifier structures with a substrate, buffer layer, channel layer, polarization layer, and anode/cathode regions, along with an anode metal region within a recess, to induce a 2D charge carrier sheet and reduce on-resistance, enabling efficient ESD protection and high breakdown voltages while minimizing area usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If III-N diodes are designed with low on-resistance, then ESD protection performance is improved, but device area increases
Solution Approach 1:
The patent transitions from planar diode structures to vertically stacked heterojunction SCR structures, utilizing the vertical dimension to achieve low on-resistance without proportionally increasing device area. The multi-layer heterostructure stacks components vertically, allowing current to flow through multiple functional layers in the vertical direction while maintaining a compact footprint.
Solution Approach 2:
The patent employs composite III-N heterostructure materials with different bandgaps and electrical properties stacked together to create the SCR device. The heterojunction between different III-N materials enables simultaneous achievement of low on-resistance in the forward conduction path and high breakdown voltage for ESD protection, resolving the contradiction between protection performance and area efficiency.
2Area of stationary object
If III-N diodes are scaled down dimensionally, then area usage is reduced, but on-resistance increases
Solution Approach 1:
By stacking multiple functional layers vertically, the patent maintains effective conduction area without increasing lateral footprint. The vertical stacking allows the device to achieve low on-resistance through optimized current paths in the vertical dimension while keeping the lateral dimensions small for compact integration.
Solution Approach 2:
The patent optimizes multiple parameters including layer thicknesses, doping concentrations, and material compositions in the heterostructure to achieve the desired balance between on-resistance and area. By carefully controlling these parameters, the device achieves low on-resistance in a compact form factor suitable for scaled integration.
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 III-N heterojunction SCR structures achieve reduced on-resistance and enhanced ESD protection, allowing for dimensional scaling and improved performance in integrated circuits by leveraging the high carrier mobility and wide bandgap of III-N materials.
Implementation Method 1
The implementation of III-N heterojunction silicon controlled rectifier structures with a substrate, buffer layer, channel layer, polarization layer, and anode/cathode regions, along with an anode metal region within a recess, to induce a 2D charge carrier sheet and reduce on-resistance
Data Source
AI summary
A Group III-Nitride (III-N) device structure is provided comprising: a heterostructure having three or more layers comprising III-N material, an anode n+ region and a cathode comprising donor dopants, wherein the anode n+ region and the cathode are on the first layer of the heterostructure and wherein the anode n+ region and the cathode extend beyond the heterostructure, and an anode metal region within a recess that extends through two or more of the layers, wherein the anode metal region is in electrical contact with the first layer, wherein the anode metal region comprises a first width within the recess and a second width beyond the recess, and wherein the anode metal region is coupled with the anode n+ region. Other embodiments are also disclosed and claimed.