3D Semiconductor Memory Air Gap Shielding
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Solution Overview
Problem
The integration of two-dimensional semiconductor devices is limited by the need for expensive processing equipment to form fine patterns, making it difficult to increase memory density, while three-dimensional semiconductor memory devices aim to address this by arranging memory cells in a vertical structure but face challenges in reducing coupling capacitance between conductive lines.
Innovation Solution
A three-dimensional semiconductor memory device is designed with a stack structure that includes air gaps and shield lines between bit lines and gate electrodes to reduce coupling capacitance, allowing for improved electrical characteristics and increased integration without the need for excessive equipment costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If two-dimensional semiconductor devices are used to increase integration, then manufacturing cost increases due to expensive processing equipment, but device density can be increased
Solution Approach 1:
The patent transitions from two-dimensional planar memory cells to three-dimensional vertically stacked memory cells. Multiple memory cell layers are stacked vertically with bit lines extending in the first direction and word lines extending in the second direction, enabling increased integration density without requiring proportionally more expensive processing equipment, as the vertical stacking utilizes the third dimension for additional capacity.
2Quantity of substance
If three-dimensional vertically stacked memory cells are used to increase integration, then device density increases, but coupling capacitance between adjacent bit lines increases
Solution Approach 1:
The patent introduces air gaps as intermediary structures between adjacent bit lines in vertically stacked memory cell layers. These air gaps act as dielectric mediators that reduce the coupling capacitance between neighboring bit lines while maintaining the compact three-dimensional vertical stacking architecture, thereby enabling high memory density without excessive capacitive interference.
3Quantity of substance
If three-dimensional vertically stacked memory cells are used to increase integration, then device density increases, but coupling capacitance between adjacent gate electrodes increases
Solution Approach 1:
The patent introduces air gaps as intermediary structures between adjacent gate electrodes in vertically stacked memory cell layers. These air gaps serve as dielectric mediators that reduce the coupling capacitance between neighboring gate electrodes, allowing the three-dimensional vertical stacking to achieve high memory density while minimizing capacitive coupling effects that would otherwise degrade device performance.
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 use of air gaps and shield lines effectively reduces capacitance between adjacent bit lines and gate electrodes, enhancing the electrical performance and integration density of the semiconductor memory device, thereby addressing the limitations of two-dimensional devices.
Implementation Method 1
a first air gap between the bit line of a first layer of the plurality of layers and the bit line of a second layer of the plurality of layers adjacent to the first layer, and a second air gap between the first gate electrode and the second gate electrode
Implementation Method 2
a first air gap between the bit line of a first layer of the plurality of layers and the bit line of a second layer of the plurality of layers adjacent to the first layer
Implementation Method 3
a second air gap between the first gate electrode and the second gate electrode
Implementation Method 4
a second air gap between the first gate electrode and the second gate electrode
Data Source
AI summary
A semiconductor device may include a stack structure that includes a plurality of layers vertically stacked on a substrate, and a plurality of gate electrodes that vertically extend to penetrate the stack structure. Each of the plurality of layers may include a plurality of semiconductor patterns that extend in parallel along a first direction, a bit line that is electrically connected to the semiconductor patterns and extends in a second direction intersecting the first direction, a first air gap on the bit line, and a data storage element that is electrically connected to a corresponding one of the semiconductor patterns. The first air gap is interposed between the bit line of a first layer of the plurality of layers and the bit line of a second layer of the plurality of layers.