3D Semiconductor Contact Layout With Alternating Depth Groups
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Solution Overview
Problem
Existing 3D semiconductor devices face challenges in efficiently managing vertical structures, particularly in terms of contact structure fabrication and stability, which affect process windows and memory density.
Innovation Solution
The contact structures in 3D semiconductor devices are grouped into alternating depth-based groups, with each group coupled to specific conductive layers, allowing for improved fabrication processes and enhanced structural stability by increasing the distance between deeper structures and optimizing their positioning.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If contact structures are densely positioned to increase memory density, then memory density improves, but fabrication difficulty and process window challenges worsen
Solution Approach 1:
The patent segments contact structures into different depth-based groups (first contact structure group, second contact structure group, third contact structure group) with alternating depths. This segmentation allows each group to be fabricated with optimized process parameters, improving ease of manufacture while maintaining high memory density through efficient spatial arrangement.
Solution Approach 2:
The patent introduces depth as an additional dimension for organizing contact structures by creating alternating depth groups. Instead of only lateral positioning, contact structures are arranged in a three-dimensional pattern with varying depths, which increases memory density while providing process window benefits for fabrication.
2Quantity of substance
If deeper contact structures are positioned closer together to increase density, then memory density improves, but process window and structural stability worsen
Solution Approach 1:
The patent segments contact structures into alternating depth groups where deeper contact structures (second group) are separated by shallower contact structures (first and third groups). This segmentation increases the effective distance between deeper structures, improving process window and reliability while still achieving high density through vertical stacking.
Solution Approach 2:
The patent uses shallower contact structures as intermediary elements between deeper contact structures. These intermediary structures act as spacers that increase the distance between deeper contact structures, thereby improving process window and structural stability without sacrificing lateral density.
3Ease of manufacture
If alternating depth-based grouping is implemented to improve process window, then fabrication ease improves, but device complexity increases
Solution Approach 1:
The patent segments contact structures into alternating depth groups that can be fabricated in separate process steps. This segmentation simplifies each individual fabrication step by reducing the number of contact structures processed simultaneously, improving ease of manufacture despite the increased overall device complexity.
Solution Approach 2:
The patent implements a periodic pattern of alternating depth groups (first group, second group, third group) that repeats throughout the device. This periodic structure provides regularity that simplifies fabrication processes through repetitive patterning, offsetting the complexity of the three-dimensional arrangement.
Data Source
AI summary
Devices and systems including contact structures, and methods for forming the contact structures in three-dimensional semiconductive devices are provided. In one aspect, a semiconductor device includes contact structures, where the contact structures are positioned along a first direction in a block of the semiconductor device. The contact structures are grouped into contact structure groups based on depths of the contact structures along a second direction perpendicular to the first direction, each contact structure group including one or more respective contact structures. Between two adjacent contact structures of a first contact structure group along the first direction, a contact structure of a second contact structure group different from the first contact structure group is positioned.