Liquid-Solvent Carbon-Transfer Diamond Deposition
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Solution Overview
Problem
Current diamond deposition techniques require high temperatures and pressures, making them inefficient and costly, and there is a need for a more efficient low-pressure, low-temperature process for producing gem-quality and semiconductor-quality diamond crystals.
Innovation Solution
A liquid-solvent carbon-transfer mechanism is used to deposit diamonds, involving a carbon-addition station, a diamond-deposition station, and a solvent-flow system with control devices and sensors to manage temperature and carbon concentration gradients, allowing for epitaxial deposition on seed diamonds or non-diamond substrates at relatively low temperatures and pressures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If high temperature and pressure methods are used for diamond deposition, then diamond crystal formation is achieved, but the process becomes inefficient and costly
Solution Approach 1:
The patent changes the physical-chemical parameters of the deposition process by using a liquid solvent medium instead of gas phase, enabling diamond deposition at lower temperatures (below 1000°C) and pressures (below 10 atm) compared to conventional CVD methods, thereby improving efficiency while maintaining crystal formation quality
Solution Approach 2:
The patent introduces a liquid solvent as an intermediary carrier that transports carbon atoms from the carbon source to the substrate surface. This liquid-mediated carbon transfer mechanism replaces direct gas-phase deposition, allowing controlled carbon delivery at lower energy conditions and improving overall process efficiency
2Reliability
If high temperature and pressure methods are used for diamond deposition, then diamond crystal formation is achieved, but the cost increases
Solution Approach 1:
By changing the deposition parameters to lower temperature and pressure ranges through liquid solvent mediation, the patent reduces energy consumption and equipment requirements, directly lowering manufacturing costs while maintaining reliable diamond crystal formation
Solution Approach 2:
The patent uses readily available liquid solvents and simple carbon sources that can be easily replenished, replacing expensive and complex equipment setups required for high-pressure high-temperature methods, thereby reducing overall manufacturing costs
3Reliability
If conventional methods are used, then diamond deposition is achieved, but growth rates are slow
Solution Approach 1:
The patent implements continuous circulation of the liquid solvent through the carbon source and substrate regions, maintaining continuous carbon supply to the deposition surface. This continuous carbon delivery mechanism sustains high growth rates while ensuring reliable diamond formation throughout the process
Solution Approach 2:
The liquid solvent acts as an efficient carbon transport intermediary that delivers carbon atoms directly to the substrate surface at high rates, enabling faster growth compared to conventional gas-phase methods where carbon transport is limited by diffusion 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
This method enables the production of high-quality diamond crystals at lower costs and faster growth rates compared to traditional high-temperature, high-pressure methods, while maintaining the crystal structure and quality of the deposited diamonds.
Implementation Method 1
a liquid-solvent carbon-transfer mechanism
Implementation Method 2
a plurality of sensors operatively coupled to the solvent-containing vessel, wherein each one of the plurality of sensors is configured to detect and transmit one or more process parameters
Implementation Method 3
a controller operatively coupled to receive the one or more transmitted parameters from each of the plurality of sensors, and operatively coupled to send out one or more control signals to each of the plurality of control devices based on the one or more transmitted parameters
Implementation Method 4
allowing for epitaxial deposition on seed diamonds or non-diamond substrates
Data Source
AI summary
A system and method for growing diamond crystals from diamond crystal seeds by epitaxial deposition at low temperatures and atmospheric and comparatively low pressures. A solvent is circulated (by thermal convection and/or pumping), wherein carbon is added in a hot leg, transfers to a cold leg having, in some embodiments, a range of progressively lowered temperatures and concentrations of carbon via the circulating solvent, and deposits layer-by-layer on diamond seeds located at the progressively lower temperatures since as diamond deposits the carbon concentration lowers and the temperature is lowered to keep the solvent supersaturated. The solvent includes metal(s) or compound(s) that have low melting temperatures and transfer carbon at comparatively low temperatures. A controller receives parameter signals from a variety of sensors located in the system, processes these signals, and optimizes diamond deposition by outputting the necessary control signals to a plurality of control devices (e.g., valves, heaters, coolers, pumps).