Ion Trap Via Structure Using a Conductive Etch Stop Layer
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Solution Overview
Problem
The increasing demands on structural complexity in ion trap devices for quantum computing and precision metrology require improved methods for reliable and scalable microfabrication, particularly in through-substrate structuring to create holes that extend through the substrate for applications like electrical vias and optical access points.
Innovation Solution
An ion trap device with a dielectric substrate featuring a via hole and an electrically conductive etch stop layer that covers the via hole, coupled with a metal layer and conductive material, allowing for the formation of electrical connections through the substrate.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If through-substrate structuring is implemented to create holes extending through the substrate, then electrical connections and optical access are enabled, but manufacturing complexity increases
Solution Approach 1:
The etch stop layer is deposited on the substrate surface before the via hole etching process begins. This preliminary action defines the etch depth and protects the substrate, enabling precise through-substrate structuring without requiring complex real-time control during etching
Solution Approach 2:
The etch stop layer acts as an intermediary element between the substrate and the via hole structure. It mediates the etching process by providing a controlled stop point, and subsequently serves as a foundation for electrical coupling the conductive material to the substrate
2Reliability
If the etch stop layer is made electrically conductive to enable electrical coupling, then electrical connection reliability improves, but the layer requires additional manufacturing steps
Solution Approach 1:
The patent merges multiple functions into the etch stop layer: it maintains the original etch stopping function for precise via hole depth control, and simultaneously provides electrical conductivity for reliable electrical coupling. This consolidation eliminates the need for separate electrical connection structures
Solution Approach 2:
The etch stop layer is designed with multi-functionality, serving both as a process control element (etch depth marker) and as an electrical connection element. This universal approach simplifies the overall device structure while maintaining manufacturing reliability
3Adaptability or versatility
If via holes are etched through the entire substrate, then structural flexibility increases for various applications, but manufacturing precision requirements increase
Solution Approach 1:
The etch stop layer is deposited beforehand to establish a precise etch depth marker. This preliminary structuring enables the etching process to achieve consistent through-substrate holes with high precision, as the etch process naturally stops when reaching the conductive layer
Solution Approach 2:
The patent replaces complex mechanical positioning and depth control systems with a material-based solution. The etch stop layer provides intrinsic depth control through its material properties and deposition thickness, eliminating the need for sophisticated real-time etch depth monitoring and adjustment mechanisms
Data Source
AI summary
An ion trap device includes a dielectric substrate and a via hole extending through the dielectric substrate from a first main surface of the dielectric substrate to a second main surface of the dielectric substrate. The ion trap device further includes an electrically conductive etch stop layer arranged on the first main surface of the dielectric substrate, the etch stop layer covering the via hole. The ion trap device further includes a metal layer of an ion trap at least partially arranged on the etch stop layer and an electrically conductive material arranged in the via hole. The etch stop layer electrically couples the electrically conductive material and the metal layer.