GaN Semiconductor Structure with Composition Change Etch Stop Layer
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Solution Overview
Problem
The manufacturing process of enhancement-mode GaN devices is complicated and prone to defects due to difficulties in precise etching of p-type semiconductor materials, leading to stability and reliability issues.
Innovation Solution
A semiconductor structure and method that includes a composition change layer with a defined change curve, allowing for precise monitoring of etching progress to prevent over-etching and damage to lower layers, using a periodic structure with alternating layers of Group III and Group V elements to control the etching process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If selective etching is used to form p-type semiconductor material in the gate region, then enhancement-mode device functionality is achieved, but manufacturing precision deteriorates due to difficulty in controlling etching thickness
Solution Approach 1:
The patent applies preliminary action by forming a composition change layer before the p-type semiconductor material layer. This composition change layer serves as a pre-prepared etching stop layer with gradually changing composition, which enables precise control of the etching process depth and prevents over-etching of the underlying semiconductor layers.
Solution Approach 2:
The composition change layer acts as an intermediary between the p-type semiconductor material layer and the underlying channel/barrier layers. It provides a gradual composition transition that serves as an etching stop mechanism, mediating the etching process to achieve precise thickness control while maintaining enhancement-mode device functionality.
2Adaptability or versatility
If selective etching is used to form p-type semiconductor material in the gate region, then enhancement-mode device functionality is achieved, but reliability deteriorates due to over-etching and defects
Solution Approach 1:
The composition change layer is formed in advance as a protective measure before depositing the p-type semiconductor material. This preliminary structure prevents over-etching by providing a controlled stop layer, thereby eliminating defects and improving device reliability while maintaining enhancement-mode functionality.
Solution Approach 2:
The composition change layer serves as a cushioning protective layer that absorbs the potential harm of over-etching. By having this layer in place beforehand, the patent prevents damage to the underlying critical layers, thus improving device stability and reliability.
3Adaptability or versatility
If selective etching is used to form p-type semiconductor material in the gate region, then enhancement-mode device functionality is achieved, but manufacturing complexity increases due to precise etching requirements
Solution Approach 1:
The composition change layer acts as an intermediary that simplifies the manufacturing process. Instead of requiring extremely precise control of the etching process to stop at the exact desired depth, the composition change layer provides a built-in stop mechanism that makes the etching process more forgiving and easier to control.
Solution Approach 2:
The patent extracts the etching control function from the etching process itself and places it in the composition change layer structure. This separation of concerns allows the etching process to be less critical, as the stop function is now provided by the layered structure rather than relying solely on process precision.
Data Source
AI summary
The present application provides a semiconductor structure and a method for manufacturing the same. The semiconductor structure includes a channel layer, a barrier layer located on the channel layer, a composition change layer located on the barrier layer, and a p-type semiconductor material layer located in the gate region of the composition change layer, wherein a gate region is defined on a surface of the composition change layer, and a material of the composition change layer includes at least one composition change element.