GaN Semiconductor Surface Damage Evaluation via Photoluminescence
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Solution Overview
Problem
Current methods for evaluating damage in compound semiconductor devices are not sufficient for detailed assessment, leading to degraded device characteristics due to surface damage during production processes like polishing and etching.
Innovation Solution
A photoluminescence-based damage evaluation method that measures the half width, intensity, or ratio of peaks in the emission spectrum to assess surface damage in compound semiconductor members, allowing for the production of semiconductor members with reduced damage levels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional evaluation methods (X-ray diffraction, SEM, cathodoluminescence) are used to assess surface damage, then general damage detection is possible, but detailed evaluation of damage level cannot be achieved
Solution Approach 1:
The patent changes the measurement parameter from general structural analysis (X-ray diffraction, SEM) to photoluminescence spectral analysis. By measuring the half width, intensity, or ratio of peaks in the emission spectrum, the method achieves detailed damage evaluation through optical property changes rather than structural imaging, thereby improving measurement precision without increasing device complexity
Solution Approach 2:
The patent replaces mechanical/physical imaging methods (SEM, X-ray diffraction) with optical spectroscopy (photoluminescence measurement). This substitution uses light-matter interaction to detect damage-induced changes in optical properties, achieving more precise damage level assessment while avoiding the complexity of sophisticated imaging equipment and sample preparation
2Manufacturing precision
If polishing or etching processes are applied to improve surface roughness, then surface quality is enhanced, but scratches or distortion are caused resulting in surface damage
Solution Approach 1:
The patent implements a feedback mechanism where photoluminescence measurement is performed to detect surface damage caused by polishing or etching. The measured parameters (half width, intensity, or ratio of emission spectrum peaks) provide feedback on the damage level, allowing process optimization to achieve the desired surface roughness while minimizing harmful surface damage
Solution Approach 2:
The patent applies photoluminescence measurement to evaluate surface damage before it significantly degrades device characteristics. By detecting damage early in the production process, preliminary corrective actions can be taken to prevent further degradation, thereby maintaining manufacturing precision while reducing harmful surface damage
3Manufacturing precision
If dry etching or wet etching is used to form thin film or fine pattern, then film formation capability is improved, but damage is caused on the surface of substrate or thin film
Solution Approach 1:
The patent uses photoluminescence measurement to provide feedback on surface damage caused by dry or wet etching processes. By monitoring changes in the emission spectrum parameters, the method enables real-time assessment of damage to the substrate or thin film surface, allowing etching conditions to be optimized to achieve precise film formation while minimizing harmful surface damage
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
Enables detailed evaluation and production of compound semiconductor members with low damage levels, improving device characteristics by accurately assessing and mitigating surface damage during production.
Implementation Method 1
a step of performing measurement of photoluminescence on a surface of the compound semiconductor member
Data Source
AI summary
A method of evaluating damage of a compound semiconductor member, comprising: a step of performing measurement of photoluminescence on a surface of the compound semiconductor member; and a step of evaluating damage on the surface of the compound semiconductor member, using a half width of a peak at a wavelength corresponding to a bandgap of the compound semiconductor member, in an emission spectrum obtained by the measurement of photoluminescence.