Nitride Semiconductor Substrate Growth for Thin-Layer Crystallinity
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional semiconductor devices face challenges in maintaining good crystallinity of nitride semiconductor substrates, especially when the semiconductor layer is formed thinly, due to increased heat generation and heat dissipation issues.
Innovation Solution
A method involving the formation of a first nitride semiconductor layer at a first temperature, followed by a change to a higher second temperature, with a higher V/III ratio for the first layer and a lower V/III ratio for the second layer, facilitates denser formation and thermal diffusion, filling grooves in the first layer with the second layer to achieve improved crystallinity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If the semiconductor layer is formed thinly to improve heat dissipation, then heat dissipation is enhanced, but crystallinity deteriorates
Solution Approach 1:
The patent applies parameter changes by varying the V/III ratio at different temperature stages during layer formation. A high V/III ratio is used at lower temperature for the first layer, then the temperature and V/III ratio are adjusted for subsequent layers. This dynamic parameter adjustment enables thin layer formation with maintained crystallinity, resolving the contradiction between thinning for heat dissipation and maintaining manufacturing precision.
Solution Approach 2:
The patent implements periodic action through multi-stage temperature and V/III ratio adjustments during the layer formation process. The process cycles through different temperature conditions (first temperature for initial layer, second higher temperature for subsequent layers) with corresponding V/III ratio changes. This periodic parameter variation allows the system to achieve both thin layer formation and good crystallinity.
2Manufacturing precision
If the V/III ratio is increased to improve layer density, then layer density is enhanced, but heat dissipation capability is reduced
Solution Approach 1:
The patent applies local quality by using different V/III ratios for different layers and temperature stages. The first nitride semiconductor layer is formed with a first V/III ratio at a first temperature, while subsequent layers use a second V/III ratio at a second temperature. This localized parameter optimization allows each layer to have appropriate density while maintaining overall heat dissipation capability through controlled total thickness.
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 method enables the formation of a nitride semiconductor substrate with good crystallinity even when the semiconductor layer is thin, enhancing heat dissipation and maintaining electrical characteristics.
Implementation Method 1
forming a first nitride semiconductor layer including aluminum, on a substrate that is at a first temperature
Implementation Method 2
changing a temperature of the substrate and the first nitride semiconductor layer to a second temperature, the second temperature being higher than the first temperature
Implementation Method 3
forming a second nitride semiconductor layer including aluminum, on the first nitride semiconductor layer that is at the second temperature
Data Source
AI summary
A method for manufacturing a nitride semiconductor substrate includes forming a first nitride semiconductor layer including aluminum, on a substrate that is at a first temperature; changing a temperature of the substrate and the first nitride semiconductor layer to a second temperature, the second temperature being higher than the first temperature; and forming a second nitride semiconductor layer including aluminum, on the first nitride semiconductor layer that is at the second temperature. In the forming of the first nitride semiconductor layer, a first V/III ratio to a supply amount of a Group V element to a supply amount of a Group III element is higher than a second V/III ratio to a supply amount of the Group V element to a supply amount of the Group III element in the forming of the second nitride semiconductor layer.