Gallium Oxide Thin Film Dopant Activation via In-Situ Annealing
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Solution Overview
Problem
Conventional Si-based power semiconductor devices have reached performance limitations, and there is a need for materials with wide bandgap or ultra-wide bandgap characteristics to meet the demands of the rapidly developing information society, with Ga2O3 emerging as a promising material due to its cost-effectiveness and ability to achieve high breakdown voltage with thinner films.
Innovation Solution
A method of manufacturing gallium oxide thin films for power semiconductors using dopant activation technology, which involves growing a buffer layer, performing epitaxial growth of a doped layer, and conducting in-situ annealing in a nitrogen atmosphere to maximize dopant activation and lattice rearrangement effects, thereby stabilizing carrier mobility and concentration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional separate annealing process is used after epitaxial growth, then dopant activation can be achieved, but the process complexity increases and manufacturing efficiency decreases
Solution Approach 1:
The patent combines the epitaxial growth process and annealing process into a single integrated operation. The in-situ annealing is performed within the same reaction chamber during epitaxial growth, eliminating the need for separate annealing equipment and process steps. This merging of processes reduces manufacturing complexity while maintaining effective dopant activation.
Solution Approach 2:
The annealing treatment is performed in advance during the epitaxial growth process itself, before the film completion stage. By incorporating the annealing step preliminarily within the growth process, the patent avoids subsequent separate annealing operations, thereby simplifying the overall manufacturing流程.
2Productivity
If in-situ annealing is performed during epitaxial growth, then manufacturing efficiency improves, but control precision of growth conditions may deteriorate
Solution Approach 1:
The reaction chamber is designed to perform multiple functions: both epitaxial growth and in-situ annealing are conducted within the same chamber using the same equipment. This multi-functionality allows the system to maintain precise control over growth conditions while integrating the annealing process, avoiding the need for additional equipment that would complicate the system.
Solution Approach 2:
The patent utilizes changes in temperature and gas flow parameters during the epitaxial growth process to simultaneously achieve both growth and annealing effects. By dynamically adjusting these parameters, the system maintains precise control over the film formation while incorporating the annealing treatment, thereby preserving manufacturing precision despite the integrated process.
3Manufacturing precision
If multiple separate processes are used for buffer layer growth and doped layer formation, then layer quality can be optimized, but production time increases
Solution Approach 1:
The patent implements a continuous process where the buffer layer growth and doped layer formation occur in sequence without interrupting the reaction chamber or stopping the gas flow. The in-situ annealing is continuously performed throughout the epitaxial growth process, ensuring that useful actions (growth and annealing) proceed continuously, thereby reducing production time while maintaining layer quality through controlled parameter adjustments.
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 method ensures stable carrier mobility and concentration, simplifies the process, and maintains the thin film's condition without surface changes, achieving carrier mobility of 3 to 50 cm2/V·s, which is essential for efficient power semiconductor performance.
Implementation Method 1
performing an in-situ annealing as it is in a growth condition of a nitrogen atmosphere at the same time as a growth of a doped layer is finished
Implementation Method 2
growing an alpha gallium oxide thin film on the buffer layer by epitaxial growth
Data Source
AI summary
Disclosed is a method of manufacturing a gallium oxide thin film for a power semiconductor using a dopant activation technology that maximizes dopant activation effect and rearrangement effect of lattice in a grown epitaxial at the same time by performing in-situ annealing in a growth condition of a nitrogen atmosphere at the same time as the growth of a doped layer is finished.