Semiconductor Memory Insulation Zoning for Current Overshoot Control
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Solution Overview
Problem
Existing semiconductor memory devices face challenges in efficiently supplying current to memory cells due to capacitance variations, leading to potential operation failures and reduced performance, especially near peripheral circuit regions.
Innovation Solution
The implementation of a semiconductor memory device with a substrate structure that includes distinct cell regions with varying dielectric constant insulating layers, where a first insulating layer with a lower dielectric constant is used in proximity to the peripheral circuit region to reduce capacitance and current overshoot, while a higher dielectric constant layer is used farther away, thereby optimizing current supply and reducing failure rates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a uniform insulating layer with high dielectric constant is used across the entire cell region, then sufficient current supply is maintained for memory cells far from peripheral circuits, but excessive current flow and capacitance interference occur near peripheral circuit regions
Solution Approach 1:
The patent applies local quality by dividing the cell region into first and second cell regions with different insulating layer characteristics. The first cell region near peripheral circuits uses an insulating layer with lower dielectric constant to reduce capacitance and current overshoot, while the second cell region uses an insulating layer with higher dielectric constant to ensure sufficient current supply. This spatial differentiation of material properties resolves the contradiction between preventing harmful current effects and ensuring adequate current delivery.
Solution Approach 2:
The patent segments the cell region into distinct zones (first cell region and second cell region) with different electrical characteristics. By introducing region-specific insulating layers with different dielectric constants, the patent creates segmented electrical environments that address the conflicting requirements of current control near peripheral circuits versus current delivery to distant memory cells.
2Object-generated harmful factors
If the insulating layer dielectric constant is reduced near peripheral circuits to limit current flow, then current overshoot is prevented, but current supply to memory cells may become insufficient
Solution Approach 1:
The patent implements local quality by assigning different dielectric constant values to insulating layers in different spatial zones. The first insulating layer near peripheral circuits has lower dielectric constant to suppress current overshoot, while the second insulating layer in the second cell region has higher dielectric constant to maintain adequate current supply. This localized optimization resolves the contradiction between current control and current delivery requirements.
3Ease of manufacture
If a single insulating layer design is used throughout the device, then manufacturing process is simplified, but performance optimization for different cell regions is compromised
Solution Approach 1:
The patent applies local quality by implementing region-specific insulating layers with different dielectric constants. The first insulating layer for the first cell region and the second insulating layer for the second cell region are designed with different material properties to optimize performance for their respective locations. This approach accepts increased manufacturing complexity in exchange for significantly improved device reliability and performance optimization.
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 approach effectively limits excessive current flow, preventing operation failures and enhancing the overall performance and reliability of the memory device by maintaining sufficient current supply to all memory cells.
Implementation Method 1
a first capacitance generated by first adjacent portions of the plurality of first lines in the first cell region and a first portion of the first insulating layer is smaller than a second capacitance generated by second adjacent portions of the plurality of first lines in the second cell region and a first portion of the second insulating layer
Implementation Method 2
a dielectric constant of the first insulating layer is smaller than a dielectric constant of the second insulating layer
Data Source
AI summary
An electronic device comprising a semiconductor memory is provided. The semiconductor memory includes a substrate including a cell region and a peripheral circuit region, the cell region including a first cell region and a second cell region, the first cell region being disposed closer to the peripheral circuit region than the second cell region; second lines disposed over the first lines and extending in a second direction crossing the first direction; memory cells positioned at intersections between the first lines and the second lines in the cell region; a first insulating layer positioned between the first lines, between the second line, or both, in the first cell region; and a second insulating layer positioned between the first lines and between the second lines in the second cell region. A dielectric constant of the first insulating layer is smaller than that of the second insulating layer.