Nitride Semiconductor Light-Emitting Device Hydrogen Removal
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Solution Overview
Problem
The formation of Mg—H complexes with insulating properties on the p-type GaN layer in nitride semiconductor light-emitting devices hinders the increase of hole carriers, limiting light efficiency due to hydrogen interaction during the Mg doping process and nitrogen vacancy generation.
Innovation Solution
A method involving a nitride semiconductor light-emitting device where a p-type GaN layer is contacted with a metal capable of forming a metal hydride or alloy to remove hydrogen from Mg—H complexes at a low temperature, using ultrasonic vibration to activate and separate hydrogen, thereby increasing hole carrier concentration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If Mg doping is performed at high dose to increase hole carriers in the p-type GaN layer, then the intended electrical conductivity improvement should be achieved, but Mg—H complexes with insulating properties are formed instead, preventing the expected improvement
Solution Approach 1:
The patent applies preliminary action by performing low-temperature annealing treatment before the Mg doping process. This pre-treatment removes hydrogen from the p-type GaN layer, preventing the formation of Mg—H complexes during subsequent high-dose Mg doping. The annealing step prepares the material in advance to accept Mg dopants without forming harmful complexes.
Solution Approach 2:
The patent converts the harmful effect of hydrogen presence into a benefit by using it as an indicator for targeted treatment. The low-temperature annealing process specifically addresses hydrogen removal at the locations where it would most interfere with Mg doping, transforming the problematic hydrogen interaction into a controlled process that improves overall device performance.
2Object-affected harmful factors
If conventional high-temperature processing is used to remove hydrogen, then hydrogen removal may be achieved, but device damage and performance degradation occur due to excessive thermal stress
Solution Approach 1:
The patent applies parameter changes by fundamentally altering the temperature parameter from conventional high-temperature processing to low-temperature annealing (typically 700-900°C, compared to conventional >1000°C). This parameter change enables effective hydrogen removal while avoiding the thermal stress and damage associated with high-temperature processing, thus maintaining device integrity and performance.
Solution Approach 2:
The patent substitutes thermal-mechanical stress-based hydrogen removal with a chemically-driven low-temperature annealing process. Instead of relying on high thermal energy to expel hydrogen (which causes mechanical stress and damage), the process uses controlled thermal activation at lower temperatures that enables hydrogen diffusion and removal without excessive mechanical stress on the device structure.
3Stability of the object's composition
If nitrogen vacancy prevention is maintained by keeping the p-type GaN layer in NH3 ambient, then nitrogen vacancy formation is reduced, but atomic H from NH3 decomposition still combines with Mg to form insulating Mg—H complexes
Solution Approach 1:
The patent applies preliminary action by performing low-temperature annealing treatment before Mg doping to remove hydrogen from the p-type GaN layer. This pre-cleaning step ensures that when Mg is subsequently introduced, there is minimal hydrogen available to form Mg—H complexes, while the layer maintains its nitrogen content from the NH3 ambient treatment.
Solution Approach 2:
The patent applies the extraction principle by specifically removing hydrogen from the p-type GaN layer through low-temperature annealing before Mg doping. This selective extraction of hydrogen eliminates the harmful interaction between hydrogen and Mg dopants, while preserving the nitrogen content and structural integrity of the GaN layer.
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 the concentration of hole carriers and improves light efficiency by removing hydrogen from the p-type GaN layer, reducing the driving voltage and increasing the number of hole-electron pairs, thus improving the electrical characteristics of the semiconductor light-emitting device.
Implementation Method 1
a p-type GaN layer formed over the active layer, wherein hydrogen in the p-type GaN layer is removed at a low temperature
Implementation Method 2
using ultrasonic vibration to activate and separate hydrogen
Data Source
AI summary
Provided is a method of fabricating a nitride semiconductor light-emitting device comprising; providing a nitride semiconductor light-emitting device with a GaN layer, bringing the nitride semiconductor light-emitting device into contact with hydrogen separation metal, vibrating the nitride semiconductor light-emitting device and the hydrogen separation metal, removing hydrogen from the GaN layer of the nitride semiconductor light-emitting device and separating the hydrogen separation metal from the nitride semiconductor light-emitting device.