InP Single-Crystal Substrate Thermal Zoning for Lower Break Failure
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Solution Overview
Problem
Existing indium phosphide single-crystal substrates suffer from high break failure rates during the process of growing an epitaxial film, which limits their yield in semiconductor device production.
Innovation Solution
The manufacturing method involves a specific configuration of a single-crystal-growing apparatus with two independently adjustable heating regions and controlled thermal distribution to manage the interface between the growing indium phosphide single-crystal and the melt, resulting in a dislocation density distribution that reduces break failure rates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional single-crystal growing methods are used, then manufacturing process is simple, but break failure rate is high
Solution Approach 1:
The heating apparatus is divided into two independent heating regions (first heating region and second heating region) that can be controlled separately. This segmentation allows independent temperature control in different zones of the single-crystal growing apparatus, enabling precise thermal management to reduce break failure rates during epitaxial film growth.
Solution Approach 2:
Different heating regions are provided with different thermal characteristics to create specific dislocation density distributions in the single crystal. The first heating region and second heating region have different temperature profiles and heating powers, allowing local optimization of crystal quality in different areas to minimize break failures.
2Manufacturing precision
If uniform heating is applied, then manufacturing process is simple, but dislocation density distribution is not optimized
Solution Approach 1:
The heating system provides non-uniform thermal distribution with different heating powers in different regions. The first heating region and second heating region are independently controlled to create specific temperature gradients that optimize dislocation density distribution in the growing single crystal, achieving precise manufacturing quality.
Solution Approach 2:
The heating power and temperature parameters are independently adjusted in different heating regions to optimize crystal growth conditions. By changing thermal parameters locally in the first and second heating regions, the dislocation density distribution is controlled to reduce break failure rates.
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
The method produces indium phosphide single-crystal substrates with reduced break failure rates, enhancing the yield and reliability in semiconductor device production.
Implementation Method 1
heating the crucible with the heater to melt the indium phosphide bulk body and a part of the seed crystal
Implementation Method 2
melt the indium phosphide bulk body and a part of the seed crystal
Implementation Method 3
growing a crystal on the residual part of the seed crystal from the indium phosphide melt
Data Source
AI summary
The indium phosphide single-crystal substrate has a circular main surface, and the main surface is virtually divided with a square grid at a grid interval of 1 mm. The square grid is composed of a plurality of grid points present along a first direction and a second direction orthogonal to the first direction. A set consisting of dislocation densities measured at the respective grid points has a first whole-surface mean as the mean of the set and a first whole-surface standard deviation as the standard deviation of the set, and each of the dislocation densities is classified as any one of a first level, a second level, and a third level. The grid points each determined to have a dislocation density classified as the second level are present in a region between an outline of a first square region and an outline of a second square region.