Nitride Semiconductor Laser Conductive Oxide Electrode Hydrogen Barrier
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Nitride semiconductor laser devices with conductive oxide electrodes experience increased operating voltage and device failures due to hydrogen permeation from dielectric layers, which deactivates Mg dopants, leading to poor electrical characteristics.
Innovation Solution
A nitride semiconductor laser device design where the conductive oxide layer covers the upper surface and side surfaces of the ridge part, with a dielectric layer and a metal layer configuration that prevents hydrogen from permeating into the second-conductivity-type semiconductor layer, and optionally includes a second metal layer to further block hydrogen, ensuring effective current confinement and reduced operating voltage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a dielectric layer is formed to cover the conductive oxide layer, then insulation is improved, but hydrogen permeation increases causing voltage increase and device failures
Solution Approach 1:
A hydrogen barrier layer is introduced as an intermediary between the dielectric layer and the conductive oxide layer. This barrier layer specifically blocks hydrogen permeation while allowing the dielectric layer to maintain its insulation function, thus resolving the contradiction between insulation improvement and hydrogen blocking.
Solution Approach 2:
The protective layering structure is segmented into multiple functional layers: a dielectric layer for insulation, a hydrogen barrier layer for hydrogen blocking, and a conductive oxide layer for electrical conduction. This segmentation allows each layer to perform its specific function without interfering with others, solving the contradiction between insulation and hydrogen permeation prevention.
2Illumination intensity
If conductive oxide is used as electrode material, then visible light absorbance is reduced and cladding function is improved, but operating voltage increases and device failures occur
Solution Approach 1:
The hydrogen barrier layer acts as a protective intermediary between the dielectric layer and conductive oxide layer, preventing hydrogen from reaching and deactivating Mg dopants in the conductive oxide. This maintains the electrical characteristics and operating voltage stability while allowing the conductive oxide to provide its optical benefits.
3Reliability
If Mg dopant is deactivated by hydrogen, then electrical conductivity is improved, but operating voltage increases and device performance deteriorates
Solution Approach 1:
The hydrogen barrier layer is positioned to preemptively block hydrogen from reaching the conductive oxide layer and Mg dopants. By preventing hydrogen penetration in advance, the barrier layer prevents Mg dopant deactivation and maintains stable operating voltage, thus countering the harmful effect before it occurs.
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 design significantly improves electrical characteristics by preventing hydrogen-induced voltage increases and device failures, enhancing the reliability and performance of nitride semiconductor laser devices.
Implementation Method 1
a conductive oxide layer disposed so as to cover an upper surface of the ridge part and portions of opposite side surfaces of the ridge part
Implementation Method 2
the exposed portion is covered with the first metal layer
Data Source
AI summary
A nitride semiconductor laser device at least includes a ridge part disposed on a second-conductivity-type semiconductor layer, a conductive oxide layer covering the upper surface of the ridge part and portions of opposite side surfaces of the ridge part, a dielectric layer covering a portion of the conductive oxide layer, and a first metal layer covering the conductive oxide layer and the dielectric layer, wherein a portion of the conductive oxide layer disposed on the upper surface of the ridge part is exposed through the dielectric layer and covered with the first metal layer.