Vacuum Microelectronic Structure With Segmented Cusp Mold
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Solution Overview
Problem
Integrated Vacuum Microelectronic Devices face high process flow costs and potential issues due to ionizing radiations and noise affecting power output, limiting their operational efficiency.
Innovation Solution
A vacuum microelectronic structure is developed using a highly doped semiconductor substrate with multiple insulating and conductive layers, featuring a vacuum trench and a second conductive layer acting as a cathode, which is sealed to maintain a controlled vacuum environment and enhance field emission efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conformal deposition of insulator into trench is used to form symmetric cusp as mold for field emission tip, then the emitter tip can be self-aligned within the center of trench and aligned to center of electrodes, but the process flow cost becomes high
Solution Approach 1:
The manufacturing process is divided into distinct stages: first forming the trench structure with electrodes, then separately creating the cusp mold, and finally using it to form the emitter tip. This segmentation allows each component to be optimized independently while maintaining overall alignment precision.
Solution Approach 2:
The cusp structure serves dual purposes: it acts as both the mold for forming the emitter tip and as a self-alignment reference. The symmetric cusp geometry automatically positions the emitter tip at the center of the trench and aligned with electrodes, eliminating the need for complex external alignment procedures.
2Ease of operation
If access trench is created in electron-emitting material to remove insulator and free sharp tip, then the field emission cathode is freed, but ionizing radiations and noise affect power output
Solution Approach 1:
The field emission cathode is nested within a protective structure that includes the cusp mold and surrounding insulating materials. This nested configuration protects the sensitive cathode region from external ionizing radiations and noise while maintaining electrical accessibility through controlled pathways.
Solution Approach 2:
The cusp structure and surrounding insulating layers act as intermediary protective barriers between the field emission cathode and external harmful factors. These intermediaries shield the cathode from ionizing radiations and electromagnetic noise while allowing the device to operate effectively.
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 noise, improving the operational efficiency and reliability of the vacuum microelectronic device by maintaining a stable vacuum environment and optimizing field emission performance.
Implementation Method 1
a highly doped semiconductor substrate
Implementation Method 2
a vacuum trench formed within said first and second insulating layers
Implementation Method 3
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
Implementation Method 4
a first insulating layer placed above said doped semiconductor substrate, a first conductive layer placed above said first insulating layer, a second insulating layer placed above said first conductive layer
Data Source
AI summary
An integrated vacuum microelectronic structure is described as having a highly doped semiconductor substrate, a first insulating layer placed above said doped semiconductor substrate, a first conductive layer placed above said first insulating layer, a second insulating layer placed above said first conductive layer, a vacuum trench formed within said first and second insulating layers and extending to the highly doped semiconductor substrate, a second conductive layer placed above said vacuum trench and acting as a cathode, a third metal layer placed under said highly doped semiconductor substrate and acting as an anode, said second conductive layer is placed adjacent to the upper edge of said vacuum trench, the first conductive layer is separated from said vacuum trench by portions of said second insulating layer and is in electrical contact with said second conductive layer.