Nanoparticle Aerosol Deposition for Flash Memory Charge Trapping
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Solution Overview
Problem
The challenge in flash memory technology is achieving uniform distribution and size of nanoparticles as charge-trapping centers, which affects the performance consistency of multilevel cell devices due to excessive variation in cell-to-cell parameters.
Innovation Solution
A process involving the formation, cleaning, and size sorting of nanoparticles to create a uniform powder, followed by dispersion in a liquid to form an aerosol, which is then directed onto a substrate to create a uniform distribution of charge-trapping centers, incorporating them into flash memory cells.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If nanoparticles are used as charge-trapping centers in flash memory, then memory capacity can be increased for multilevel cell devices, but excessive variation in cell-to-cell performance parameters occurs due to non-uniform distribution and size of nanoparticles
Solution Approach 1:
The patent applies preliminary action by forming a uniform nanoparticle powder through controlled synthesis and size sorting before dispersion. The nanoparticles are pre-sorted into narrow size ranges and uniformly dispersed in a carrier liquid before being applied to the substrate, ensuring consistent size and distribution from the outset rather than attempting to correct variations afterward.
Solution Approach 2:
The patent employs parameter changes by controlling the physical and chemical parameters of nanoparticle synthesis, including size, shape, and material composition. By precisely adjusting synthesis conditions and selecting specific material parameters, the patent achieves uniform nanoparticle characteristics that resolve the contradiction between high capacity and manufacturing precision.
2Ease of manufacture
If conventional nanoparticle formation methods are used, then charge-trapping centers can be created, but excessive variation in cell-to-cell performance parameters results
Solution Approach 1:
The patent introduces an intermediary carrier liquid that uniformly suspends the nanoparticles. This carrier liquid acts as a mediator between the nanoparticle synthesis process and the final memory device fabrication, ensuring that nanoparticles are delivered in a controlled, uniform manner that maintains both ease of manufacture and high reliability.
Solution Approach 2:
The patent performs preliminary size sorting and uniform dispersion of nanoparticles in a carrier liquid before application to the substrate. This preliminary preparation ensures that when nanoparticles are deposited as charge-trapping centers, they maintain uniform size and distribution, achieving both ease of manufacture and consistent cell-to-cell 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
This approach ensures uniform size and distribution of nanoparticles, enhancing the performance consistency of flash memory cells by reducing variation in cell-to-cell parameters, particularly beneficial for multilevel cell devices.
Implementation Method 1
an aerosol may be formed from the liquid having the nanoparticles dispersed therein, and such aerosol may be directed onto a substrate
Data Source
AI summary
Some embodiments include methods of forming charge-trapping zones. The methods may include forming nanoparticles, transferring the nanoparticles to a liquid to form a dispersion, forming an aerosol from the dispersion, and then directing the aerosol onto a substrate to form charge-trapping centers comprising the nanoparticles. The charge-trapping zones may be incorporated into flash memory cells.