Semiconductor Bonding Pads with Diffusion Barrier Layers
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Solution Overview
Problem
In semiconductor devices, the presence of metal bonding pads without surrounding metal lines leads to dishing or erosion during chemical mechanical planarization, resulting in incomplete edge seal structures that allow moisture or ionic impurities to diffuse through, compromising the reliability of semiconductor components.
Innovation Solution
The integration of diffusion barrier layers surrounding bonding pads in semiconductor dies to prevent the diffusion of moisture and impurities, enhancing the reliability of semiconductor devices by forming a continuous barrier around the bonding pads.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If metal bonding pads are provided without surrounding metal lines, then the bonding pad area is maximized, but dishing or erosion occurs during chemical mechanical planarization resulting in incomplete edge seal structures
Solution Approach 1:
The bonding pad structure is segmented into multiple functional layers: a metal bonding pad layer for electrical connection, and a surrounding dielectric diffusion barrier layer with embedded metal lines for edge sealing. This segmentation allows the bonding pad area to be maximized while the surrounding barrier structure provides complete edge sealing to prevent moisture and impurity diffusion.
Solution Approach 2:
A dielectric diffusion barrier layer is introduced as an intermediary structure between the metal bonding pad and the surrounding environment. This intermediate layer contains embedded metal lines that form continuous edge seal structures, preventing direct exposure of the bonding pad edges to moisture and ionic impurities while maintaining large bonding pad area.
2Reliability
If diffusion barrier layers are added around bonding pads, then reliability is improved by preventing moisture and impurity diffusion, but device complexity increases
Solution Approach 1:
The dielectric diffusion barrier layer serves multiple functions simultaneously: it acts as a moisture and impurity barrier, provides a substrate for embedding metal lines that form edge seal structures, and maintains electrical isolation. This multi-functionality improves reliability without proportionally increasing device complexity.
Solution Approach 2:
The diffusion barrier function and the edge seal function are merged into a single integrated structure. The dielectric diffusion barrier layer contains embedded metal lines that together form both the protective barrier and the continuous edge seal, eliminating the need for separate structures and reducing overall complexity.
3Adaptability or versatility
If driver circuit is located on the same substrate as memory array, then device integration is achieved, but valuable substrate space is consumed reducing memory array area
Solution Approach 1:
The patent transitions from a planar two-dimensional layout to a three-dimensional vertical structure. The bonding pads are formed with embedded diffusion barrier layers and metal lines in multiple stacked layers, utilizing the vertical dimension to provide edge sealing and protection functions that would otherwise require additional lateral space, thereby preserving maximum substrate area for the memory array.
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 diffusion barrier layers effectively reduce or prevent the diffusion of moisture and impurities, improving the reliability and longevity of semiconductor components by ensuring a complete seal around the bonding pads.
Implementation Method 1
diffusion barrier layers embedding bonding pads and methods for manufacturing the same... prevent the diffusion of moisture and impurities
Data Source
AI summary
Semiconductor devices can be formed over a semiconductor substrate, and interconnect-level dielectric material layers embedding metal interconnect structures can be formed thereupon. In one embodiment, a pad-connection-via-level dielectric material layer, a proximal dielectric diffusion barrier layer, and a pad-level dielectric material layer can be formed. Bonding pads surrounded by dielectric diffusion barrier portions can be formed in the pad-level dielectric material layer. In another embodiment, a layer stack of a proximal dielectric diffusion barrier layer and a pad-and-via-level dielectric material layer can be formed. Integrated pad and via cavities can be formed through the pad-and-via-level dielectric material layer, and can be filled with bonding pads containing dielectric diffusion barrier portions and integrated pad and via structures.