3D Memory Cell Layout With Bit Line Strapping and Lower Capacitance
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Solution Overview
Problem
The integration of two-dimensional semiconductor elements is limited by the need for expensive fine pattern forming technologies, restricting the degree of integration and efficiency.
Innovation Solution
A semiconductor memory device with a three-dimensional arrangement of memory cells, including bit lines, gate electrodes, and capacitor structures, utilizing bit line strapping and selection lines to enhance integration and reduce capacitance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If two-dimensional semiconductor elements are used to increase integration, then manufacturing cost increases due to expensive fine pattern forming technology, but the degree of integration is still restrictive
Solution Approach 1:
The patent transitions from two-dimensional planar arrangement to three-dimensional vertical stacking of memory cells. Multiple memory cells are arranged in the vertical direction (first direction perpendicular to substrate surface), enabling higher integration without requiring increasingly expensive fine pattern forming technologies. This dimensional change allows the degree of integration to be determined by vertical stacking capability rather than lateral pattern precision.
2Device complexity
If three-dimensional memory cells are arranged to increase integration, then the degree of integration improves, but electrical characteristics and reliability may deteriorate due to increased capacitance
Solution Approach 1:
The patent extracts and removes unnecessary bit lines from the three-dimensional memory structure. By eliminating redundant bit lines that would increase capacitance, the design achieves higher integration through vertical stacking while maintaining favorable electrical characteristics. The bit line removal strategy specifically targets lines that do not contribute to memory cell selection or data storage functions.
Solution Approach 2:
The patent changes the physical arrangement parameters of memory cells from planar to vertical stacking, and modifies the bit line configuration by removing redundant lines. This parameter change reduces total capacitance in the memory device while increasing integration level, thereby improving both electrical characteristics and reliability simultaneously.
3Ease of operation
If all bit lines are kept in three-dimensional memory structure, then connectivity is maintained, but total capacitance increases reducing efficiency
Solution Approach 1:
The patent removes redundant bit lines from the three-dimensional memory structure, extracting only the necessary bit lines required for memory cell selection and data access. This reduction minimizes total capacitance while maintaining adequate connectivity through the remaining bit lines and word line structures, thereby improving energy efficiency.
Data Source
AI summary
Provided a semiconductor memory device. The semiconductor memory device includes a substrate, a gate electrode on the substrate, a bit line on the substrate, a cell semiconductor pattern on a side of the gate electrode and electrically connected to the bit line, a capacitor structure including a first electrode electrically connected to the cell semiconductor pattern, a second electrode on the first electrode, and a capacitor dielectric film between the first electrode and the second electrode, a bit line strapping line spaced apart from the bit line in the second direction, and electrically connected to the bit line, a bit line selection line between the bit line and the bit line strapping line, and a selection semiconductor pattern between the bit line and the bit line strapping line and electrically connected to all of the bit line, the bit line strapping line, and the bit line selection line.