Gallium Oxide Semiconductor Interface Stability
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Solution Overview
Problem
Semiconductor devices with Ga2O3 and SiC materials face issues with breakdown voltage and chemical degradation due to oxidation-reduction reactions at p-n junction interfaces, particularly under heat and current stress.
Innovation Solution
An oxide semiconductor device structure is introduced, featuring an n-type gallium oxide layer, a p-type oxide semiconductor layer with a different main component, and an oxide layer made of a material distinct from gallium oxide, positioned between the n-type and p-type layers to inhibit chemical reactions and maintain interface integrity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If a p-n junction interface is formed between n-type gallium oxide layer and p-type oxide semiconductor layer, then the device structure is established, but chemical reactions (oxidation-reduction) occur at the interface causing deterioration of device characteristics
Solution Approach 1:
An oxide layer is introduced as an intermediary between the n-type gallium oxide layer and the p-type oxide semiconductor layer. This intermediate oxide layer prevents direct contact between the two semiconductor layers, thereby preventing oxidation-reduction reactions at the interface while maintaining the p-n junction functionality. The intermediary layer acts as a buffer that preserves interface stability without compromising device characteristics.
2Ease of manufacture
If post-annealing or heat treatment is applied to the semiconductor device, then the manufacturing process is completed, but the heat causes oxidation-reduction reactions at the p-n interface deactivating conductivity
Solution Approach 1:
The oxide layer is formed beforehand as a protective barrier before heat treatment is applied during manufacturing. This pre-formed protective layer cushions the interface against thermal effects during subsequent annealing processes, preventing heat-induced oxidation-reduction reactions that would otherwise deactivate the conductivity of the semiconductor layers.
3Ease of operation
If current is applied to operate the device, then the device functions, but the current generates heat that brings oxidation-reduction reactions to the fore
Solution Approach 1:
The oxide layer serves as a thermal buffer and chemical barrier during device operation. When current flows through the device and generates heat, the intermediate oxide layer prevents direct thermal and chemical interaction between the n-type and p-type layers, suppressing heat-induced oxidation-reduction reactions while allowing the device to function normally.
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 structure prevents deterioration of the semiconductor device's characteristics, such as heat resistance and voltage resistance, by reducing chemical reactions at the p-n interface and enhancing breakdown voltage.
Implementation Method 1
chemical change (an oxidation-reduction reaction) at an interface of the p-n junction deactivates the conductivity of the p-type semiconductor
Data Source
AI summary
An object is to provide a technology for enabling prevention of deterioration of characteristics of an oxide semiconductor device. The oxide semiconductor device includes an n-type gallium oxide epitaxial layer, a p-type oxide semiconductor layer, and an oxide layer. The p-type oxide semiconductor layer is disposed above the n-type gallium oxide epitaxial layer, contains an element different from gallium as a main component, and has p-type conductivity. The oxide layer is disposed between the n-type gallium oxide epitaxial layer and the p-type oxide semiconductor layer, and is made of a material different from gallium oxide and different at least partly from a material of the p-type oxide semiconductor layer.