CVD Chamber Metal Discs for Diamond Growth
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Solution Overview
Problem
Current methods for producing single crystalline diamonds via Microwave Plasma Chemical Vapor Deposition (MPCVD) face limitations in achieving high substrate temperatures at low microwave power, resulting in inefficient growth rates and non-uniform conditions, particularly when producing multiple diamonds.
Innovation Solution
The method involves placing diamond seeds in a CVD chamber with metal discs to reflect microwave radiation, generating high temperatures at low power and manipulating plasma position for uniform growth, using a CVD chamber with adjustable metal discs and micro-positioners to maintain consistent plasma density and temperature.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If high microwave power is used to generate high substrate temperature, then the substrate temperature is improved, but the energy efficiency deteriorates
Solution Approach 1:
Metal discs are introduced as intermediary elements to reflect and concentrate microwave radiation onto the substrate. These discs act as focal elements that transform distributed microwave energy into concentrated thermal energy, enabling high substrate temperatures at lower overall microwave power levels.
Solution Approach 2:
The patent introduces spatial arrangement of metal discs at specific distances from the substrate to create focal points for microwave energy. By positioning discs at optimized distances (e.g., 5-15 cm from substrate), the system creates a dimensional transformation where microwave radiation is concentrated onto a specific focal region, enhancing thermal efficiency.
2Productivity
If multiple diamond seeds are produced simultaneously, then the productivity is improved, but the uniformity of growth conditions deteriorates
Solution Approach 1:
The system uses multiple independently positionable metal discs arranged around multiple diamond seeds. Each disc can be independently positioned and adjusted to ensure uniform microwave radiation distribution across all seeds, maintaining consistent growth conditions while producing multiple diamonds simultaneously.
Solution Approach 2:
The metal discs are designed to be movable and repositionable during the deposition process. This dynamic adjustment capability allows the system to maintain optimal plasma distribution and temperature uniformity across multiple diamond seeds, adapting to variations in growth conditions to ensure consistent results.
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 enables high growth rates and uniform conditions for producing single crystalline diamonds, achieving temperatures over 1250°C at low microwave power, with efficient carbon deposition and maintaining quality across multiple diamond seeds.
Implementation Method 1
placing metal discs in the CVD chamber to reflect the microwave radiation
Implementation Method 2
generating high temperature at low microwave power
Implementation Method 3
when plasma is created at a microwave frequency of 2.45 GHz
Implementation Method 4
Chemical Vapor Deposition (CVD) process
Implementation Method 5
depositing a diamond film using a microwave plasma generating apparatus
Data Source
AI summary
A method and an apparatus for producing one or more single crystalline diamonds. One or more diamond seeds are placed in a substrate holder in a chemical vapor deposition (CVD) chamber. One or more metal discs are then positioned in the chemical vapor deposition chamber such that high temperature is generated at low microwave power. A diamond forming gas is then provided adjacent to the one or more diamond seeds. Plasma is then generated from the diamond forming gas by exposing the diamond forming gas to microwave radiation. The one or more diamond seeds are then exposed to the plasma under certain conditions to form single crystalline diamonds. The position of the plasma is manipulated to provide uniform growth conditions at the growth surface of the one or more diamond seeds.