IC Connector Access Region Oblique Contact Isolation
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Solution Overview
Problem
The challenge in photolithography is the large lateral size of interlayer connectors in integrated circuits, which can lead to improper electrical connections with adjacent conductive layers due to their size and positioning, despite efforts to reduce dimensions for increased density.
Innovation Solution
The method involves creating interlayer connectors that are electrically isolated from adjacent conductive layers by orienting contact areas at an oblique angle, using a photoresist or dielectric mask to etch and oxidize specific regions, and depositing dielectric layers to ensure precise contact and isolation, allowing connectors to extend above the contact plane while avoiding adjacent conductors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If interlayer connectors are made larger to ensure reliable electrical contact, then connection reliability improves, but the risk of contacting adjacent conductive layers increases
Solution Approach 1:
The patent applies local quality by creating non-conductive regions in specific locations of adjacent conductive layers. The dielectric material is selectively placed to make certain areas non-conductive, ensuring that even if connectors are large or slightly mispositioned, they will only contact intended conductive regions and not adjacent ones. This localized modification of conductivity properties solves the contradiction between connector size and safety margin.
2Productivity
If connector size is reduced to increase circuit density, then manufacturing precision requirements worsen, but connection reliability may improve
Solution Approach 1:
The patent implements beforehand cushioning by pre-establishing non-conductive regions in adjacent layers before connectors are formed. These non-conductive zones act as a safety buffer or cushion that tolerates positioning variations and manufacturing tolerances. Even if connectors are not perfectly positioned, the pre-prepared non-conductive regions prevent improper contact, thus cushioning against manufacturing precision issues while enabling higher density.
3Reliability
If the number of mask layers is increased to improve connector isolation, then manufacturing complexity increases
Solution Approach 1:
The patent merges multiple functions into existing mask layers. Instead of adding separate mask layers solely for isolation, the invention combines the isolation function with the existing contact hole definition masks. The same mask that defines contact hole positions also defines the non-conductive regions, thereby achieving connector isolation without increasing the total number of mask layers, thus avoiding increased manufacturing complexity.
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 effectively prevents electrical contact with non-conductive regions of adjacent layers, ensuring accurate and reliable interlayer connections by controlling the size and orientation of contact areas and using dielectric layers to isolate connectors from adjacent conductors.
Implementation Method 1
using a photoresist or dielectric mask to etch and oxidize specific regions
Implementation Method 2
using a photoresist or dielectric mask to etch and oxidize specific regions
Implementation Method 3
using a photoresist or dielectric mask to etch and oxidize specific regions
Implementation Method 4
depositing dielectric layers to ensure precise contact and isolation
Data Source
AI summary
A connector access region of an integrated circuit device includes a set of parallel conductors, extending in a first direction, and interlayer connectors. The conductors comprise a set of electrically conductive contact areas on different conductors which define a contact plane with the conductors extending below the contact plane. A set of the contact areas define a line at an oblique angle, such as less than 45° or 5° to 27°, to the first direction. The interlayer connectors are in electrical contact with the contact areas and extend above the contact plane. At least some of the interlayer connectors overlie but are electrically isolated from the electrical conductors adjacent to the contact areas with which the interlayer connectors are in electrical contact. The set of parallel conductors may include a set of electrically conductive layers with the contact plane being generally perpendicular to the electrically conductive layers.