Nitride Semiconductor Ridge Mounting Stability

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Solution Overview

Problem

Conventional semiconductor devices with ridge-like structures face challenges in mounting due to potential damage from pressure, requiring additional steps for dummy-ridge formation, which increases complexity and reduces yields.

Innovation Solution

A method for fabricating semiconductor elements with nitride semiconductor growth layers, where engraved regions with depressed portions and ridge portions are formed on a substrate, allowing for the growth of thicker dummy-ridge portions adjacent to the engraved regions, eliminating the need for separate dummy-ridge formation steps and enhancing mounting stability.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If dummy-ridge regions are formed by separate laying steps or thickness adjustment, then mounting stability is improved, but the number of fabrication steps increases and yields decrease

Engineering Contradiction:

Improvemounting stabilityVSAvoidnumber of fabrication steps

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent combines the formation of dummy-ridge portions with the main nitride semiconductor growth layer formation process. By using selective masking and etching to create depressed regions before growth, the dummy-ridge portions are formed simultaneously with the functional layers, eliminating separate dummy-ridge formation steps and reducing overall process complexity.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The patent performs preliminary etching to create depressed regions on the substrate before laying the nitride semiconductor growth layer. This preliminary action defines where dummy-ridge portions will form, allowing the growth process itself to create the thickness variation needed for mounting stability without requiring post-growth adjustments.

Inventive Principle:

Principle #10Preliminary action

2Reliability

If the ridge portion is elevated for current constriction, then current confinement is improved, but the ridge portion becomes susceptible to pressure damage during mounting

Engineering Contradiction:

Improvecurrent confinementVSAvoidpressure damage risk

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The patent applies local quality by creating different thicknesses of nitride semiconductor growth layer in different regions. The dummy-ridge portions have greater thickness than the ridge-like portion, providing localized mechanical support exactly where needed to prevent pressure damage during mounting, while maintaining the elevated ridge structure for current confinement.

Inventive Principle:

Principle #3Local quality

3Reliability

If thicker dummy-ridge portions are formed to prevent damage, then mounting stability improves, but separate formation steps are required increasing process complexity

Engineering Contradiction:

Improvemounting stabilityVSAvoidfabrication efficiency

Core Design Contradiction:

ReliabilityVSProductivity

Solution Approach 1:

The formation of dummy-ridge portions with greater thickness is merged into the main semiconductor growth process. By controlling the deposition conditions and using selective masking, the dummy-ridge portions accumulate more material during the same growth cycle as the functional layers, achieving the desired thickness difference without additional formation steps.

Inventive Principle:

Principle #5Merging (Combining)

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 simplifies the fabrication process, reduces the risk of damage during mounting, and improves yields by allowing thicker dummy-ridge portions to be formed in conjunction with the nitride semiconductor growth layer, thereby preventing pressure-induced damage to the ridge portions.

Implementation Method 1

a top portion of a semiconductor growth layer is formed into a ridge-like shape by etching or the like and is sandwiched between different patches of an insulating film for current constriction

Methodology Applied

Scientific EffectEpitaxy: Epitaxy