3D Semiconductor Memory Gate Line Integration
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Solution Overview
Problem
The scaling down of semiconductor devices leads to increased resistance and electrostatic capacitance in interconnection lines, making it difficult to achieve high-speed operation and reliability in semiconductor memory devices.
Innovation Solution
The semiconductor memory device design includes a lower gate line and an upper gate line with capacitors and conductive lines arranged in specific directions, along with semiconductor and insulating patterns to enhance electrical characteristics and reliability, allowing for improved connection and insulation between components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the minimum feature size or critical dimension is reduced to increase integration, then the integration density is improved, but the resistance of interconnection lines and electrostatic capacitance increase
Solution Approach 1:
The patent transitions from planar 2D interconnection to 3D vertical interconnection by forming conductive patterns that extend in the depth direction (z-axis) through multiple layers. The lower and upper gate lines are positioned at different vertical levels with capacitors connecting them through insulating layers, creating a three-dimensional architecture that reduces lateral crowding and interconnection resistance while maintaining high integration density.
Solution Approach 2:
The patent implements nested structures where the first capacitor is positioned between the lower gate line and upper gate line, with the second capacitor nested adjacent to it in the first direction. The conductive patterns are embedded within insulating layers that are themselves embedded within the overall device structure, creating multiple levels of nesting that maximize space utilization and reduce parasitic effects.
2Quantity of substance
If the minimum feature size is reduced to increase integration, then the integration density is improved, but the electrostatic capacitance between interconnection lines increases
Solution Approach 1:
The patent introduces insulating layers as intermediary materials between conductive elements. The first insulating layer is positioned between the lower gate line and upper gate line, and the second insulating layer is positioned between adjacent capacitors. These insulating intermediaries reduce direct electrostatic coupling between conductive lines, thereby decreasing parasitic capacitance while allowing closer spacing for higher integration.
3Quantity of substance
If device scaling is performed to meet increasing demand for highly-integrated devices, then the integration level is improved, but the high-speed operation becomes difficult to realize
Solution Approach 1:
The patent employs three-dimensional vertical stacking of gate lines, capacitors, and insulating layers to achieve high integration without further lateral scaling. This vertical architecture shortens current paths and reduces RC delays compared to continued planar scaling, thereby maintaining high-speed operation capability while achieving higher integration levels.
Data Source
AI summary
A semiconductor memory device is provided. The device may include a lower gate line provided on a substrate and extended in a first direction, an upper gate line vertically overlapped with the lower gate line and extended in the first direction, a first capacitor provided between the lower gate line and the upper gate line, a second capacitor provided between the lower gate line and the upper gate line and spaced apart from the first capacitor in the first direction, a lower semiconductor pattern provided to penetrate the lower gate line and connected to the first capacitor, an upper semiconductor pattern provided to penetrate the upper gate line and connected to the second capacitor, and a lower insulating pattern provided between the second capacitor and the lower gate line to cover the entire region of a bottom surface of the second capacitor.