Semi-insulating Compound Semiconductor Substrate Uniformity
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current semi-insulating compound semiconductor substrates lack uniform microdistribution of specific resistance across all crystal orientations, leading to non-uniform micro flatness and affecting device performance, especially in miniaturized structures.
Innovation Solution
A semi-insulating compound semiconductor substrate with a (100) plane orientation is developed, where the standard deviation of specific resistance is controlled to be no more than 0.1 mm in all directions, achieved by reducing dislocation density through a crystal growth method that manages thermal stress and crystal growth orientation, using a cylindrical crucible with alternating heat-insulating materials.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional crystal growth methods are used, then production efficiency is maintained, but uniform microdistribution of specific resistance is not achieved
Solution Approach 1:
The patent applies parameter changes by precisely controlling crystal growth parameters including temperature gradient (maintaining specific gradient directions), growth rate, and atmospheric conditions during the vertical boat method process. These parameter adjustments ensure uniform specific resistance distribution while maintaining production efficiency
Solution Approach 2:
The patent implements local quality control by managing thermal fields and stress distributions at different locations within the crystal growth zone. The alternating heating and cooling zones create localized temperature gradients that promote uniform dislocation distribution throughout the crystal structure
2Manufacturing precision
If dislocation density is reduced to improve uniformity, then manufacturing precision improves, but crystal growth complexity increases
Solution Approach 1:
The patent applies segmentation by dividing the crystal growth process into distinct zones with alternating heating and cooling functions. The crucible is segmented into multiple thermal zones that can be independently controlled, allowing precise management of temperature gradients and stress distribution to reduce dislocations
Solution Approach 2:
The patent uses an intermediary thermal field created by alternating heating and cooling zones as a mediator to control dislocation formation. This thermal intermediary indirectly manages crystal structure uniformity by controlling the growth environment rather than directly manipulating the crystal lattice
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 approach results in a substrate with uniform microdistribution of specific resistance, enhancing micro flatness and enabling high-quality, high-performance devices by minimizing dislocation density and maintaining stable crystal growth.
Implementation Method 1
reducing dislocation density through a crystal growth method that manages thermal stress
Implementation Method 2
cylindrical crucible with alternating heat-insulating materials
Data Source
AI summary
A semi-insulating compound semiconductor substrate includes a semi-insulating compound semiconductor, the semi-insulating compound semiconductor substrate being configured such that, on a major plane having a plane orientation of (100), a standard deviation/average value of specific resistance measured at intervals of 0.1 mm along equivalent four directions in a <110> direction from a center of the major plane, and a standard deviation/average value of specific resistance measured at intervals of 0.1 mm along equivalent four directions in a <100> direction from the center of the major plane are each not more than 0.1.