Single-Crystal Diamond Cleavage for Low-Loss [111] Substrates
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Solution Overview
Problem
Existing methods for processing single crystal diamond substrates, particularly those with a [111] orientation, face challenges such as high processing loss and difficulty in forming high-density NV centers, requiring complex and time-consuming processes like ion implantation and polishing, which are inefficient and costly.
Innovation Solution
A method involving laser processing to form a modified layer with graphite and cracks on the diamond surface, allowing spontaneous delamination along the [111] surface, reducing processing loss by forming a cleavage plane through controlled laser scanning.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If ion implantation is used to form a defective layer for delamination, then delamination can be achieved, but a high vacuum environment is required and processing time is long
Solution Approach 1:
The patent replaces the mechanical/physical process of ion implantation with a chemical process using etchant solution. The etchant selectively removes the defective layer formed by laser irradiation, achieving delamination without requiring vacuum equipment. This substitutes a complex vacuum-based physical process with a simpler chemical etching process.
Solution Approach 2:
The patent changes the processing parameters from high-vacuum ion implantation to ambient-temperature chemical etching. By forming the defective layer with laser irradiation and then removing it with etchant solution, the process operates under different parameter conditions (ambient pressure, liquid phase) that eliminate the need for vacuum equipment and reduce processing time.
2Manufacturing precision
If conventional slicing and polishing methods are used for [111] oriented diamond, then substrates can be produced, but processing loss is high and the process is complex
Solution Approach 1:
The patent performs preliminary laser irradiation to form a defective layer exactly where needed on the diamond surface, followed by selective etching. This preliminary action defines the precise location and depth of the defect layer, enabling subsequent easy removal without requiring extensive material removal through conventional slicing and polishing, thereby reducing processing loss.
Solution Approach 2:
The patent applies laser irradiation locally to form defective layers only in specific regions where delamination is needed. The etchant then selectively removes only these locally-formed defective layers. This local quality approach avoids the need to process the entire substrate through complex slicing and polishing operations, reducing overall processing loss.
3Manufacturing precision
If bulk crystal diamond is separated from base crystal and polished to desired thickness, then substrates can be obtained, but processing time is long and complexity increases
Solution Approach 1:
The patent replaces time-consuming mechanical polishing with a chemical etching process. After laser irradiation forms the defective layer at the desired depth, etchant solution rapidly removes this layer to achieve the target thickness. This chemical substitution dramatically reduces processing time compared to traditional mechanical polishing while maintaining precision.
Solution Approach 2:
The patent changes from mechanical removal (polishing) to chemical removal (etching) parameters. The etchant selectively removes the laser-formed defective layer at controlled rates, achieving precise thickness control much faster than mechanical polishing. This parameter change from mechanical to chemical processes resolves the time complexity 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 approach enables efficient production of [111] oriented diamond substrates with minimal loss, improving yield and simplifying subsequent processing steps like polishing, while maintaining high precision for magnetic sensor applications.
Implementation Method 1
radiating the laser light on the upper surface of the block from the laser condensing unit and condensing the laser light inside the block
Implementation Method 2
forming a modified layer, which includes a processing mark of graphite and a crack extending along a surface (111) around the processing mark
Implementation Method 3
forming a cleavage plane at the predetermined depth of the remaining region of the upper surface of the block by spontaneously propagating cleavage from the modified layer
Data Source
AI summary
A method of manufacturing a diamond substrate includes: a step of placing a laser condensing unit 190 configured to condense laser light B so as to face an upper surface 10a of a block 10 of single crystal diamond, a step of forming a modified layer 20, which includes a processing mark 21 of graphite and a crack 22b extending along a surface (111) around the processing mark 21, in a partial region of the upper surface 10a of the block 10 along the surface (111) of the single crystal diamond, along the surface (111) of the single crystal diamond at a predetermined depth from the upper surface 10a of the block 10 by radiating the laser light B on the upper surface 10a of the block 10 from the laser condensing unit 190 under predetermined conditions and condensing the laser light B inside the block 10, and moving the laser condensing unit 190 and the block 10 in a relative manner two-dimensionally, and a step of forming a cleavage plane 25 at the predetermined depth of the remaining region of the upper surface 10a of the block 10 by spontaneously propagating cleavage from the modified layer 20.