Schottky Electrode Material Selection for Alpha-Gallium Oxide Semiconductors
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Solution Overview
Problem
Semiconductor devices using α-Ga2O3 as a semiconductor face issues with Schottky and ohmic electrode functionality due to incompatibility with conventional electrode materials, leading to impaired semiconductor properties.
Innovation Solution
A semiconductor device with a crystalline oxide semiconductor layer of corundum structure and a Schottky electrode containing metals from Groups 4-9 of the periodic table, specifically transition metals, which enhances semiconductor properties and Schottky characteristics without compromising the semiconductor's integrity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional electrode materials (Ti, Al, Au, Pt, Ni) are used for α-Ga2O3 semiconductor devices, then Schottky and ohmic characteristics are required, but the electrodes fail to function properly, detach from the film, or impair semiconductor properties
Solution Approach 1:
The patent changes the material parameter of the electrode from conventional metals (Ti, Al, Au, Pt, Ni) to Group 4 transition metals (Ti, Zr, Hf). This material substitution resolves the contradiction by finding a metal that forms a stable Schottky barrier with α-Ga2O3 while maintaining good adhesion and not impairing semiconductor properties.
Solution Approach 2:
The patent employs a composite electrode structure combining Group 4 transition metals with other metals (such as Ti-Al-Au laminates or Ti-Zr-Hf combinations). This composite approach enables the electrode to simultaneously achieve Schottky characteristics, good adhesion to α-Ga2O3, and compatibility with semiconductor properties.
2Adaptability or versatility
If β-Ga2O3 is used as semiconductor, then existing electrode structures can be applied, but α-Ga2O3 requires different electrode materials to achieve proper Schottky characteristics
Solution Approach 1:
The patent identifies that the crystal structure parameter (α-corundum vs β-gallic) is the key differentiator requiring different electrode materials. By changing the electrode material parameter to Group 4 transition metals, the patent achieves compatibility with α-Ga2O3's unique crystal structure and band gap properties.
3Quantity of substance
If high concentration dopant is used in β-Ga2O3, then high temperature annealing (800-1100°C) is required, but this increases manufacturing costs
Solution Approach 1:
The patent changes the semiconductor material parameter from β-Ga2O3 to α-Ga2O3, which has different thermal and electrical properties. This material substitution enables lower temperature processing and reduces the stringent annealing requirements while maintaining high dopant concentration capabilities.
Data Source
AI summary
A semiconductor device is provided that is excellent in semiconductor properties and Schottky characteristics. A semiconductor device includes: a semiconductor layer containing a crystalline oxide semiconductor with a corundum structure as a major component; and a Schottky electrode on the semiconductor layer, wherein the Schottky electrode is formed by containing a metal of Groups 4-9 of the periodic table, thereby manufacturing a semiconductor device excellent in semiconductor properties and Schottky characteristics without impairing the semiconductor properties to use the semiconductor device thus obtained for a power device and the like.