Conductive Pipe Formation Between Neighboring IC Features
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Solution Overview
Problem
The increasing complexity of integrated circuits poses challenges in fabricating patterned features with tight spacings, making it difficult to form conductive interconnects effectively between neighboring features.
Innovation Solution
The method involves forming conductive pipes between features using a conductive material within a dielectric structure, where the dielectric materials are layered to create a void that is filled with the conductive material, allowing for the creation of conductive interconnects in tight spaces, and the use of dielectric materials with varying densities to facilitate the formation of these pipes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional methods are used to form patterned features, then manufacturing processes are simpler, but manufacturing precision deteriorates due to tight spacings at increasing integration levels
Solution Approach 1:
The patent segments the formation of conductive interconnects into distinct stages: forming mandrels, depositing dielectric materials, forming openings, and filling with conductive material. This segmentation allows each step to be optimized independently, achieving precise spacing control while managing fabrication complexity through systematic process division.
Solution Approach 2:
The patent employs preliminary actions by first forming mandrels and depositing dielectric materials before creating the final conductive interconnects. The dielectric material is deposited to define precise spacing boundaries beforehand, which then guides the subsequent formation of conductive features, ensuring manufacturing precision is established early in the process.
2Productivity
If tight spacings are used to increase integration levels, then integration density improves, but ease of manufacture deteriorates
Solution Approach 1:
The patent introduces dielectric material as an intermediary substance that mediates between the mandrels and the final conductive interconnects. This intermediary layer enables precise spacing control and simplifies the fabrication of tight spacings by providing a manufacturable pathway through controlled material deposition and removal, rather than attempting to directly form conductive features at tight intervals.
Solution Approach 2:
The patent utilizes parameter changes in material properties and deposition conditions to achieve tight spacings. By controlling the deposition parameters of dielectric materials and adjusting etch selectivity, the process achieves precise spacing control that enables higher integration density while maintaining manufacturing feasibility through optimized process parameters.
3Productivity
If conductive interconnects are formed in tight spaces, then integration levels increase, but manufacturing precision requirements become more stringent
Solution Approach 1:
The patent transitions from planar feature formation to three-dimensional structure formation by depositing dielectric materials that extend vertically between mandrels. This dimensional change allows precise horizontal spacing control through the vertical deposition process, enabling tight spacings at high integration levels while managing precision requirements through multi-dimensional process control.
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 enables the formation of conductive interconnects in tight spaces within integrated assemblies, enhancing the integration density and efficiency of logic circuits by allowing for the packing of conductive pipes in minimal spaces, thereby improving the integration level of integrated circuits.
Implementation Method 1
The dielectric material pinches off at a top of the intervening space to form a tube
Data Source
AI summary
Some embodiments include an integrated assembly having a pair of substantially parallel features spaced from one another by an intervening space. A conductive pipe is between the features and substantially parallel to the features. The conductive pipe may be formed within a tube. The tube may be generated by depositing insulative material between the features in a manner which pinches off a top region of the insulative material to leave the tube as a void region under the pinched-off top region.