Crystalline Pillar Substrate for Precise Ion Implantation
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Solution Overview
Problem
The precise localization of implanted ions in crystalline materials is challenging due to the statistical nature of particle propagation, leading to difficulties in achieving accurate positioning and control over implantation depth and lateral spread.
Innovation Solution
A substrate with a crystalline bulk and a pillar structure, surrounded by a buffer layer, where the pillar extends away from the surface in the implantation direction, ensuring that ions propagate through the pillar and into the bulk with high lateral positional accuracy, with scattered ions being stopped in the buffer layer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If ions are implanted directly into the bulk without a pillar structure, then the implantation process is simple, but the lateral positioning accuracy of implanted ions deteriorates due to statistical propagation and channeling effects
Solution Approach 1:
The substrate is segmented into distinct functional regions: a pillar structure that guides ion propagation and a buffer layer that stops scattered ions. This segmentation allows precise control over ion trajectories by creating a dedicated pathway (pillar) separated from the bulk material, thereby improving lateral positioning accuracy while managing structural complexity through functional division.
Solution Approach 2:
The pillar structure acts as an intermediary element between the ion source and the bulk material. It mediates ion propagation by providing a defined crystallographic pathway that guides ions to the implantation region, reducing lateral spread. The buffer layer serves as another intermediary that intercepts and stops scattered ions before they can reach the bulk, further enhancing positioning precision.
2Manufacturing precision
If a pillar structure with buffer layer is introduced for controlled implantation, then lateral positioning accuracy improves, but the substrate preparation complexity and manufacturing difficulty increase
Solution Approach 1:
The pillar structure and buffer layer are prepared in advance before ion implantation. The pillar is formed with specific crystallographic orientation and dimensions that pre-determine the ion propagation path and depth. The buffer layer is deposited beforehand to the required thickness to ensure scattered ions are stopped at the correct position. This preliminary preparation enables precise implantation depth control while simplifying the actual implantation process.
Solution Approach 2:
The pillar dimensions (height, cross-section) and buffer layer thickness are carefully controlled parameters that directly determine implantation depth and lateral spread. By adjusting these geometric parameters, precise control over ion implantation characteristics is achieved. The crystallographic orientation of the pillar is also a controlled parameter that influences channeling effects and propagation depth.
3Manufacturing precision
If ions propagate through crystalline material with open channels, then implantation depth increases, but lateral spread increases reducing positioning accuracy
Solution Approach 1:
The pillar structure provides a localized region with specific crystallographic quality that is optimized for ion guidance. Within the pillar, the crystal orientation is controlled to create favorable channeling conditions that promote straight propagation. Outside the pillar, in the buffer layer, the crystal structure is either absent or misoriented to prevent channeling and stop ions. This local differentiation of crystal quality enables control over both propagation depth and lateral spread.
Solution Approach 2:
The channeling effect, which normally causes unwanted lateral spread in bulk crystalline materials, is converted into a beneficial guidance mechanism within the pillar. By confining channeling to the pillar region only, ions that would otherwise scatter laterally are instead guided straight through the pillar to the implantation region. Scattered ions are then stopped by the buffer layer, transforming the potentially harmful channeling effect into a useful ion guidance mechanism.
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 allows for controlled and precise implantation of ions into a designated region within the bulk, minimizing lateral spread and achieving high positional accuracy, thereby improving the effectiveness of single ion implantation and qubit production.
Implementation Method 1
crystalline materials exhibit open channels and planes, along which particles, especially implanted ions, can propagate further in depth as well as laterally depending on channel orientation
Implementation Method 2
the buffer layer covering the surface of the bulk and the sides of the pillar
Data Source
AI summary
The present invention is related to a substrate (10) for a controlled implantation of ions (80) into a bulk (20), the substrate (10) comprising the bulk (20) composed of a crystalline first material (70), the bulk (20) comprising an implantation region (28) and a surface (22), wherein the implantation region (28) is located within the bulk (20) and along an implantation direction (82) at an implantation depth (26) below an implantation area (24) on the surface (10) of the bulk (20). Further, the present invention is related to a method of preparing a substrate (10) for a controlled implantation of ions (80) into a bulk (20), preferably the aforementioned substrate (10), the substrate (10) comprising the bulk (20) composed of a crystalline first material (70), the bulk (20) comprising an implantation region (28) and the surface (22), wherein the implantation region (28) is located within the bulk (20) and along an implantation direction (82) at an implantation depth (26) below an implantation area (24) on the surface (22) of the bulk (20).