Polarized Dielectric NAND Structure for Cell Interference Control
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Solution Overview
Problem
In NAND memory devices, the electric fields from aggressor cells can cause interference and latency issues with nearby victim cells due to the storage of charge in charge trapping materials, leading to decreased gate control and increased errors.
Innovation Solution
Incorporating a polarized dielectric material with a fixed polarity near the channel, which shifts the electron distribution closer to the charge trapping material, reducing the effect of the aggressor cell's electric field on victim cells and enhancing gate control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If charge trapping material is used to store data in NAND memory cells, then data storage capability is improved, but electric field interference between adjacent cells increases
Solution Approach 1:
A polarized dielectric material is introduced as an intermediary layer between the charge trapping material and the channel. This mediator material with fixed polarity creates an electric field that counteracts the harmful electric fields from aggressor cells, thereby reducing cell-to-cell interference while preserving data storage functionality
Solution Approach 2:
The patent changes the electrical parameters of the dielectric material by introducing polarization. The polarized dielectric material has a fixed polarity that generates a compensating electric field, altering the overall electric field distribution in the memory cell structure to reduce interference between adjacent cells
2Area of moving object
If memory cells are placed close together to increase density, then storage density is improved, but cell-to-cell interference increases
Solution Approach 1:
The polarized dielectric material is applied locally at the interface between the channel and charge trapping material where electric field interference is most severe. This localized application creates a targeted compensation effect that reduces cell-to-cell interference without requiring changes to the entire memory cell structure or reducing overall cell density
3Productivity
If voltage is applied to program memory cells, then data programming is improved, but gate control is affected by electric field changes
Solution Approach 1:
The polarized dielectric material is pre-configured with a fixed polarity that creates a compensating electric field before data programming occurs. This preliminary anti-action counteracts the electric field changes that would otherwise be caused by programming operations, thereby maintaining gate control reliability during data programming
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 solution reduces cell-to-cell interference, increases gate control, and improves the uniformity of the channel electron distribution, thereby enhancing the performance and reliability of NAND memory devices by minimizing the impact of electric fields on adjacent cells.
Implementation Method 1
the electric fields generated by charged aggressor cells can interfere with nearby victim cells
Implementation Method 2
Incorporating a polarized dielectric material with a fixed polarity near the channel in NAND structures, which shifts the electron distribution closer to the charge trapping material
Data Source
AI summary
Methods, systems, and devices for NAND structures with polarized materials are described. A memory device may include a polarized dielectric material located relatively near to a channel, which may reduce interference between cells. The polarized dielectric material may include a dielectric material with a fixed polarity and having a first surface with a negative polarity oriented towards the channel. The negative polarity of the polarized dielectric material may affect an electron distribution of the channel by shifting the electron distribution closer to an associated charge trapping material. The shifted electron distribution may reduce an effect of an electric field of any aggressor cells of the memory device on one or more victim cells, by creating a more uniform channel electron distribution and increasing gate control relative to a channel without the effects of the polarized dielectric material.