Diamond Membrane Etching via Ion Implantation Damage Layer
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Solution Overview
Problem
The production of thin diamond membranes for optical and quantum electronic devices is hindered by the difficulty in achieving uniform thickness due to the hardness of diamond, which results in sample roughness and non-uniformity, and the slow etching rates of existing techniques like Reactive Ion Etching.
Innovation Solution
A method involving ion implantation to create a damage layer of sp2 bonded carbon within the diamond, followed by electrochemical etching in a solution with high electrical conductivity (at least 500 μS cm−1) and ions capable of forming radical species, significantly increases the etch rate and achieves uniform thickness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of stationary object
If mechanical polishing is used to achieve thin diamond membranes, then the thickness can be reduced, but the surface roughness and non-uniformity increase due to the hardness of diamond
Solution Approach 1:
The patent replaces mechanical polishing with electrochemical etching to remove the damaged layer created by ion implantation. This chemical/electrochemical approach eliminates the mechanical contact that causes surface roughness and non-uniformity, while still achieving the required thin membrane thickness through controlled material removal.
Solution Approach 2:
The patent performs ion implantation before etching to create a controlled damaged layer at a specific depth. This preliminary action defines the exact thickness of the membrane to be produced, and the subsequent electrochemical etching removes only this damaged layer, ensuring uniform thickness without the roughness problems of mechanical polishing.
2Manufacturing precision
If ion implantation and electrochemical etching are used to produce thin membranes, then uniform thickness is achieved, but the process complexity increases
Solution Approach 1:
The patent changes the electrical conductivity parameter of the etching solution to at least 500 μS cm−1, which dramatically increases the etching rate while maintaining the uniformity benefits of the electrochemical process. This parameter optimization reduces processing time without adding process complexity.
3Productivity
If conventional electrochemical etching is used with low conductivity solutions, then the process is simple, but the etching rate is extremely slow
Solution Approach 1:
The patent changes the electrical conductivity parameter of the etching solution to at least 500 μS cm−1 by adjusting solution composition (e.g., using sulfuric acid or other conductive electrolytes). This parameter change increases the etching rate by over an order of magnitude compared to conventional low-conductivity solutions, directly addressing the productivity issue.
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 achieves bulk etch rates over an order of magnitude faster than previous processes, reducing production time and cost, and enabling the production of diamond products with uniform thickness suitable for advanced electronic and optical applications.
Implementation Method 1
ion implantation to create a damaged layer within the diamond, where the ions come to rest
Implementation Method 2
electrochemically etching the damage layer to separate therefrom the first diamond layer, wherein the electrochemical etching is performed in a solution containing ions, the solution having an electrical conductivity of at least 500 μS cm−1
Implementation Method 3
the solution having an electrical conductivity of at least 500 μS cm−1
Implementation Method 4
wherein the ions are capable of forming radical species during electrolysis
Data Source
AI summary
A method for forming a diamond product. Diamond material is provided and a damage layer comprising sp2 bonded carbon is formed in the material. The presence of the damage layer defines a first diamond layer above and in contact with the damage layer and a second diamond layer below and in contact with the damage layer. The damage layer is electrochemically etched to separate it from the first layer, wherein the electrochemical etching is performed in a solution containing ions, the solution having an electrical conductivity of at least 500 μS cm−1, and wherein the ions are capable of forming radicals during electrolysis. The diamond product is also described.