Nitride Resonant Tunneling Diode Barriers to Block Gallium Diffusion

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Solution Overview

Problem

Nitride-based resonant tunneling diodes face issues with device stability and low peak-to-valley current ratio, limiting their practical application in terahertz technology.

Innovation Solution

The use of AlxInyN and AlmInnN barrier layers with a gallium-containing potential well layer, along with AlN-based isolation layers, reduces the growth temperature and prevents gallium diffusion, ensuring uniform compositions and improved device stability and current ratio.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If high temperature growth process is used for nitride-based resonant tunneling diode, then growth speed is improved, but gallium diffusion occurs causing non-uniform composition and poor device stability

Engineering Contradiction:

Improvegrowth speedVSAvoiddevice stability

Core Design Contradiction:

ProductivityVSReliability

Solution Approach 1:

AlN isolation layers are introduced as intermediary structures between the barrier layers and the gallium-containing potential well layer. These isolation layers act as diffusion barriers that prevent gallium atoms from migrating into the barrier layers during high-temperature growth, thereby maintaining composition uniformity and device stability while allowing high-temperature processing for improved growth speed

Inventive Principle:

Principle #24Intermediary (Mediator)

2Productivity

If high temperature process is used, then epitaxial growth efficiency is improved, but layer composition uniformity deteriorates due to gallium diffusion

Engineering Contradiction:

Improveepitaxial growth efficiencyVSAvoidlayer composition uniformity

Core Design Contradiction:

ProductivityVSManufacturing precision

Solution Approach 1:

The AlN isolation layers serve as protective intermediary structures that physically block gallium diffusion pathways. This allows the epitaxial growth process to proceed at high temperatures for improved efficiency while the isolation layers maintain sharp interfaces and uniform composition by preventing atomic intermixing between layers

Inventive Principle:

Principle #24Intermediary (Mediator)

3Reliability

If conventional GaAs-based material is used, then device maturity is achieved, but power output is limited to micro-watt level

Engineering Contradiction:

Improvedevice maturityVSAvoidpower output

Core Design Contradiction:

ReliabilityVSPower

Solution Approach 1:

The patent transitions from GaAs-based materials to nitride-based materials (GaN, AlN, InGaN), fundamentally changing the material system parameters. This material substitution enables exploitation of nitride materials' superior properties including higher breakdown fields and higher electron saturation velocities, which directly enable high-power terahertz emission while maintaining device functionality through the dual-barrier quantum well structure

Inventive Principle:

Principle #35Parameter changes

4Power

If nitride-based material is used to increase power output, then potential for high-power emission is achieved, but peak-to-valley current ratio and device stability deteriorate

Engineering Contradiction:

Improvepower output potentialVSAvoidpeak-to-valley current ratio

Core Design Contradiction:

PowerVSReliability

Solution Approach 1:

AlN isolation layers are strategically positioned between the barrier layers and the gallium-containing potential well layer to prevent gallium diffusion. This maintains the sharpness of the dual-barrier quantum well structure, which is critical for achieving a high peak-to-valley current ratio, while still allowing nitride-based materials to provide high-power emission capability

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The patent applies different material compositions locally: AlxInyN1-x-y for barrier layers and AlmInnN1-m-n for isolation layers, with specific composition ranges optimized for their respective functions. This local optimization ensures that each region of the device has the precise properties needed for its function, improving both peak-to-valley ratio and stability

Inventive Principle:

Principle #3Local quality

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 enhances device stability and peak-to-valley current ratio by avoiding high-temperature processes and maintaining uniform layer thickness, thereby improving the performance of nitride-based resonant tunneling diodes.

Implementation Method 1

a resonant tunneling diode, as a dual-terminal device, can produce negative differential resistance by using resonant tunneling phenomenon

Methodology Applied

Scientific EffectResonant tunneling: Resonance

Implementation Method 2

epitaxially growing a first barrier layer, a potential well layer, and a second barrier layer

Methodology Applied

Scientific EffectEpitaxy: Epitaxy

Data Source

PatentUS20230290892A1Resonant tunneling diodes and manufacturing methods thereof

Publication Date: 2023.09.14 ENKRIS SEMICON

AI summary

The present disclosure provides a resonant tunneling diode and a manufacturing method thereof. The resonant tunneling diode includes: a first barrier layer; a second barrier layer; and a potential well layer between the first barrier layer and the second barrier layer, a material of the first barrier layer being AlxInyN1-x-y, 1>x>0, 1>y>0, and/or a material of the second barrier layer being AlmInnN1-m-n, 1>m>0, 1>n>0, and a material of the well layer including a gallium element.