Suspended Cathode Vacuum Microelectronic Device
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Solution Overview
Problem
Integrated vacuum microelectronic devices face challenges with high process flow costs and potential issues from ionizing radiations and noise affecting power output.
Innovation Solution
A novel integrated vacuum microelectronic device structure comprising a highly doped semiconductor substrate, insulating layers, a vacuum aperture, and metal layers acting as cathode and anode, where the first metal layer is suspended over the vacuum aperture, improving electron emission and device performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conformal deposition of insulator into aperture is used to form cusp, then field emission tip alignment is improved, but process complexity and manufacturing cost increase
Solution Approach 1:
The aperture is pre-formed with a suspended configuration before cathode material deposition, establishing the geometric framework in advance. This preliminary structural preparation eliminates the need for subsequent conformal insulator deposition and cusp formation steps, while maintaining precise alignment of the field emission tip through the pre-established aperture geometry
Solution Approach 2:
The insulator material is selectively removed from the aperture region to create a suspended aperture structure. This extraction eliminates the need for complex conformal deposition processes while preserving the alignment function, as the suspended aperture itself provides the necessary geometric constraint for tip positioning
2Stability of the object's composition
If traditional vacuum tube structure is used, then device robustness is maintained, but miniaturization and integration are prevented
Solution Approach 1:
The cathode material is deposited within the suspended aperture structure, nesting the emission function inside the pre-formed geometric framework. This nested configuration maintains structural robustness through the aperture framework while enabling miniaturization by concentrating all functions within a compact suspended volume
Solution Approach 2:
The suspended aperture structure acts as a thin-film framework that provides mechanical support and structural stability. This thin-film approach maintains device robustness while dramatically reducing overall device volume compared to traditional bulk vacuum tube structures, enabling integration onto substrates
3Reliability
If cusp is filled with electron-emitting material, then field emission capability is achieved, but access aperture removal complexity increases
Solution Approach 1:
The suspended aperture structure is prepared in advance with open access pathways before cathode material deposition. This preliminary configuration allows straightforward material filling while maintaining ease of manufacture, as the access apertures are already positioned and sized appropriately for the deposition process without requiring subsequent removal steps
Solution Approach 2:
The suspended aperture structure inherently provides self-aligned access pathways that automatically position opening apertures correctly during material deposition. This self-service geometry eliminates the need for complex aperture removal and repositioning operations, as the structure guides the deposition process itself
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 solution reduces process complexity and enhances operational stability by optimizing electron emission and reducing noise, thereby improving the efficiency and reliability of the vacuum microelectronic device.
Implementation Method 1
When an appropriate positive potential difference is applied between the cathode and the control electrode, an electric field is generated at the cathode that allows electrons to tunnel through a vacuum space and move towards the anode
Implementation Method 2
at least one insulating layer placed above said doped semiconductor substrate
Data Source
AI summary
An integrated vacuum microelectronic device comprises: a highly doped semiconductor substrate, at least one insulating layer) placed above said doped semiconductor substrate, a vacuum aperture formed within said at least one insulating layer and extending to the highly doped semiconductor substrate, a first metal layer acting as a cathode, a second metal layer placed under said highly doped semiconductor substrate and acting as an anode. The first metal layer is placed adjacent to the upper edge of the vacuum aperture and the vacuum aperture has a width dimension such as the first metal layer remains suspended over the vacuum aperture.