Staggered Word Line Layout to Reduce Capacitive Coupling
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Solution Overview
Problem
The strong capacitive coupling effect between adjacent word lines in semiconductor structures, such as DRAM, affects the electrical properties and needs to be reduced to improve performance.
Innovation Solution
The word lines are arranged in a staggered manner perpendicular to the substrate surface, with adjacent lines partially or completely staggered to minimize capacitive coupling without increasing the structure's dimensions, and the bit lines and bit line leads are arranged to reduce overlap and enhance integration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If word lines are arranged at the same horizontal height, then the structure is simple and easy to manufacture, but the capacitive coupling effect between adjacent word lines is strong, affecting electrical properties
Solution Approach 1:
The patent transitions from a two-dimensional planar arrangement where all word lines are at the same horizontal height to a three-dimensional staggered arrangement. Word lines in upper layers are horizontally offset from word lines in lower layers, utilizing the vertical dimension to reduce capacitive coupling while maintaining manufacturing feasibility through standard semiconductor layering techniques.
2Reliability
If word lines are arranged in a staggered manner, then the capacitive coupling effect is reduced and electrical performance is improved, but the structure becomes more complex
Solution Approach 1:
The patent divides the word line array into multiple horizontal layers, with each layer containing a subset of word lines. This segmentation allows adjacent word lines in different layers to be horizontally offset, reducing capacitive coupling. The segmentation into layers simplifies the complexity management by organizing word lines into discrete, manufacturable groups.
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 arrangement effectively reduces capacitive coupling, improves electrical performance, enhances memory density, and simplifies the manufacturing process while maintaining a compact design.
Implementation Method 1
word lines are located at a same horizontal height, which leads to a strong capacitive coupling effect between adjacent word lines
Data Source
AI summary
A semiconductor structure includes a substrate and a plurality of word lines located on a top surface of the substrate. Each of the word lines extends in a direction perpendicular to the top surface of the substrate. The plurality of word lines are arranged at intervals along a first direction. Any two adjacent ones of the word lines are arranged in an at least partially staggered manner along the first direction. The first direction is a direction parallel to the top surface of the substrate.