Metallic Nanocrystals in Nonvolatile Memory Fabrication
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Solution Overview
Problem
Conventional nonvolatile memory devices, such as SONOS memory devices, face issues with electric field concentration and defects affecting their physical characteristics, particularly due to the presence of substitution elements that can damage the tunnel oxide film and charge storage film, leading to operational problems during voltage applications.
Innovation Solution
A method of fabricating nonvolatile memory devices involving the formation of metallic nanocrystals between the charge storage film and the blocking insulation layer, where first and second metallic dots are formed through a substitution reaction, minimizing the diffusion of substitution elements and distributing the electric field uniformly, thereby reducing defect-induced issues.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of stationary object
If substitution elements are used in the charge storage film, then the tunnel oxide film thickness can be reduced, but electric field concentration occurs at defects causing damage to films and operational problems
Solution Approach 1:
Metallic nanocrystals are introduced as intermediary structures between the charge storage film and blocking insulation layer. These nanocrystals act as intermediate electrodes that redistribute the electric field, preventing concentration at defects while maintaining the thin tunnel oxide structure necessary for low operating voltage
Solution Approach 2:
The electric field distribution parameter is changed from concentrated (at defects) to uniform (throughout the structure) by introducing metallic nanocrystals. This parameter change allows the thin tunnel oxide to withstand the electric field without damage, resolving the reliability issue
2Ease of manufacture
If defects are present in the multi-layer film, then manufacturing is simplified, but electric field convergence at defects causes numerous operational problems
Solution Approach 1:
Instead of attempting to eliminate all defects (which would complicate manufacturing), the invention converts the harmful effect of defects into a beneficial one by introducing metallic nanocrystals that actively manage and redistribute the electric field around defect regions, transforming potential failure points into controlled field distribution zones
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 method effectively disperses the electric field and minimizes the impact of defects, enhancing the operational stability and reliability of the nonvolatile memory device by forming metallic nanocrystals that act as intermediate electrodes, ensuring a uniform electric field distribution and preventing substitution element diffusion.
Implementation Method 1
distributing the electric field uniformly, thereby reducing defect-induced issues
Implementation Method 2
first and second metallic dots are formed through a substitution reaction, minimizing the diffusion of substitution elements
Data Source
AI summary
In one embodiment, a nonvolatile memory device can be fabricated by forming first metallic dots on a charge storage film using first source gas, forming substitution dots on the charge storage film on which the first metallic dots are formed and forming second metallic dots using a second source gas.