Self-Aligned Defect Doping in Micro-Nanostructures for NV Sensors
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Solution Overview
Problem
Existing methods for defect doping in micro-nanostructures face challenges in controlling the spatial position of defects, leading to alignment errors and high costs due to complex alignment processes.
Innovation Solution
A self-alignment process involving a sacrificial layer and photoresist layer to form a double-layer thin film structure, followed by lithography, isotropic etching, ion implantation, and etching to achieve precise positioning of defects, eliminating the need for additional alignment operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If traditional maskless ion implantation is used for defect doping, then the doping process is simple, but the spatial position of defects cannot be controlled accurately
Solution Approach 1:
The patent introduces a sacrificial layer as an intermediary component between the ion implantation source and the crystal substrate. This sacrificial layer acts as a temporary mask that defines the doping region, enabling precise spatial control of defect positions while maintaining a relatively simple ion implantation process. The sacrificial layer is removed after doping, leaving only the desired defect pattern.
Solution Approach 2:
The patent performs preliminary patterning of the sacrificial layer before ion implantation. By pre-defining the mask hole pattern in the sacrificial layer, the method establishes the exact spatial positions where defects will be created during subsequent ion implantation, ensuring high positioning accuracy without complicating the doping process itself.
2Manufacturing precision
If complex alignment processes are used to achieve fixed-position defect doping, then the spatial positioning accuracy of defects is improved, but the device complexity and cost increase
Solution Approach 1:
The sacrificial layer serves multiple functions simultaneously: it acts as a pattern transfer mask, a protective layer during ion implantation, and a self-aligned reference structure. This self-service approach eliminates the need for separate alignment operations between different processing steps, reducing both process complexity and alignment errors while maintaining high spatial positioning accuracy.
Solution Approach 2:
The patent combines multiple functions into the sacrificial layer structure: patterning, protection, and alignment reference. By merging these functions into a single integrated structure rather than using separate components for each function, the method reduces the number of alignment operations required and simplifies the overall manufacturing process while achieving precise defect positioning.
3Manufacturing precision
If multiple alignment operations are performed to achieve fixed-position defect doping, then the positioning accuracy is improved, but the manufacturing time and cost increase
Solution Approach 1:
The sacrificial layer is patterned in advance with the exact geometry and position where defects are desired. This preliminary patterning establishes a permanent reference framework that guides all subsequent processing steps without requiring additional alignment operations, significantly reducing manufacturing time while maintaining high positioning accuracy.
Solution Approach 2:
The sacrificial layer structure provides self-alignment for all subsequent processing steps including ion implantation and etching. This self-service alignment mechanism eliminates the need for time-consuming alignment operations between different equipment and processing steps, reducing total manufacturing time while ensuring consistent defect positioning accuracy.
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 ensures high precision and simplicity in defect positioning, enhancing the yield and optical fluorescence collection efficiency of micro-nanostructures, particularly in NV center sensors, by accurately placing defects at the center of the structure.
Implementation Method 1
performing a lithography on the photoresist layer to form a mask hole according to a micro-nano pattern
Implementation Method 2
performing an isotropic etching on the sacrificial layer through the mask hole, and amplifying the micro-nano pattern to the sacrificial layer
Implementation Method 3
performing an ion implantation doping on an exposed crystal surface below the mask hole
Implementation Method 4
etching an exposed crystal surface, and removing the mask material on the surface and forming a specific defect by annealing
Implementation Method 5
forming a specific defect by annealing
Data Source
AI summary
The present disclosure provides a fixed-position defect doping method for a micro-nanostructure based on a self-alignment process, including: S1, sequentially forming a sacrificial layer and a photoresist layer on a surface of a crystal substrate; S2, performing a lithography on the photoresist layer to form a mask hole according to a micro-nano pattern; S3, performing an isotropic etching on the sacrificial layer through the mask hole, and amplifying the micro-nano pattern to the sacrificial layer; S4, performing an ion implantation doping on an exposed crystal surface below the mask hole; S5, removing the photoresist layer, and depositing a mask material; S6, removing the sacrificial layer, and transferring a micro-nano amplified pattern in the sacrificial layer to a mask material pattern; and S7, etching an exposed crystal surface, and removing the mask material on the surface and forming a specific defect by annealing.