Intermetallic Dielectric Cavity Interconnects for Dense Semiconductor Routing
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Solution Overview
Problem
The increasing complexity and miniaturization of semiconductor-based electronic devices require improved interconnection structures to efficiently connect more components with smaller metallization levels and interconnect structures.
Innovation Solution
The formation of cavities in intermetallic dielectric layers between conductive elements, followed by the creation of ports that are filled with conductive material to form continuous conductive tracks and vias, utilizing anisotropic and isotropic etching techniques to enhance connectivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the number of metallization levels is increased to connect more electronic components, then the connectivity and functionality of the device is improved, but the device size and structural complexity increase
Solution Approach 1:
The patent segments the dielectric layer into multiple regions with different cavity densities. First regions contain cavities at a first density while second regions contain cavities at a second density, allowing different areas to serve different connectivity functions. This segmentation enables complex interconnection patterns without uniformly increasing structural complexity across the entire device.
Solution Approach 2:
The patent introduces a vertical dimension to cavity density variation by creating cavities at different depths and concentrations in different regions. This dimensional approach allows the structure to achieve higher connectivity capacity without proportionally increasing lateral footprint or overall structural complexity.
2Volume of moving object
If the interconnect structure is miniaturized to decrease device size, then the compactness is improved, but the manufacturing precision and reliability deteriorate
Solution Approach 1:
The patent applies local quality by varying cavity density according to regional requirements. First regions with higher cavity density are placed where connectivity is critical, while second regions with lower density are used where connectivity demands are lower. This localized optimization maintains manufacturing precision in critical areas while achieving overall device miniaturization.
Solution Approach 2:
The patent changes the parameter of cavity density spatially across different regions. By adjusting cavity density as a variable parameter rather than maintaining a uniform value, the design achieves miniaturization while preserving sufficient manufacturing precision in areas where it matters most for device functionality.
3Reliability
If cavities are formed in intermetallic dielectric layers to improve connectivity, then the electrical continuity is improved, but the manufacturing process complexity increases
Solution Approach 1:
The manufacturing process is segmented into regions with different cavity formation requirements. By dividing the dielectric layer into first and second regions with different cavity densities, the patent enables selective cavity formation processes that improve electrical continuity where needed while avoiding unnecessary process complexity in areas where simple interconnections suffice.
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 method enables efficient interconnection of electronic components by forming continuous conductive tracks and vias, improving the electrical continuity and reducing the size of the electronic device while maintaining structural integrity.
Implementation Method 1
utilizing anisotropic and isotropic etching techniques to enhance connectivity
Implementation Method 2
utilizing anisotropic and isotropic etching techniques to enhance connectivity
Data Source
AI summary
The present description concerns a method comprising providing a structure comprising a semiconductor substrate, conductive elements above the semiconductor substrate, a first intermetallic dielectric layer between the conductive elements, cavities in the first intermetallic dielectric layer between two adjacent conductive elements, and a second intermetallic dielectric layer above the first intermetallic dielectric layer and the cavities, the cavities being coupled together so as to form a continuous extended cavity between the two adjacent conductive elements, forming first, respectively second, ports running through the second intermetallic dielectric layer, extending to the cavities, respectively to the conductive elements, filling the first and second ports with a conductive material, the filling of the first ports filling the cavities, forming conductive regions coupled together, and thus a conductive track, and forming first conductive vias coupled to the conductive track, and filling the second ports forming second conductive vias coupled to the conductive elements.