SiNx-SiOy Programmable Memory Cell for Lower Charge Loss
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Solution Overview
Problem
Current memory cell technologies face challenges in efficiently storing and retaining data due to limitations in programmable materials and charge-blocking regions, which affect the reliability and longevity of non-volatile memory cells.
Innovation Solution
The use of programmable material comprising at least two regions of SiNx with an intervening region of SiOy, where 'x' is 0.5 to 3.0 and 'y' is 1.0 to 3.0, enhances the charge-blocking and charge-passage capabilities, improving data retention and storage efficiency in memory cells.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional programmable materials are used in memory cells, then device complexity is reduced, but data retention and storage efficiency deteriorate due to thermionic emission and charge loss
Solution Approach 1:
The programmable material is divided into multiple distinct regions (first region, second region, and intervening region) with different material compositions (SiNx with different x values or different materials like SiOy). This segmentation allows each region to perform specific functions: the first and second regions provide charge-blocking capabilities while the intervening region controls charge passage, thereby reducing thermionic emission and improving data retention without requiring overly complex external control mechanisms.
Solution Approach 2:
The patent employs composite material structures where different regions of the programmable material have different compositions (e.g., SiNx with varying x values from 0.5 to 3.0, or combinations with SiOy). This composite approach enables optimization of electrical properties in different regions, creating a material system that simultaneously achieves low thermionic emission and controlled charge passage, thus improving reliability while managing complexity through material design rather than structural complexity.
2Reliability
If single-region programmable material is used, then manufacturing process is simplified, but charge-blocking capability is insufficient leading to charge loss
Solution Approach 1:
The programmable material is segmented into functionally distinct regions (first region adjacent to charge passage material, second region adjacent to charge-blocking material, and an intervening region between them). Each region is engineered with specific material properties to optimize charge-blocking and charge-passage capabilities. This segmentation enhances charge-blocking performance by creating multiple barriers and controlled pathways, while the regions can be formed through sequential deposition or transformation processes that are compatible with existing manufacturing workflows.
Solution Approach 2:
The patent utilizes parameter changes in material composition (varying x in SiNx from 0.5 to 3.0, or using different materials like SiOy in the intervening region) to achieve different electrical characteristics in different regions. By controlling compositional parameters during formation, the charge-blocking capability is enhanced without requiring fundamentally new manufacturing techniques, as standard deposition and thermal processing methods can be used to create the desired material gradients and interfaces.
3Reliability
If high charge-blocking material is used to prevent charge loss, then data retention improves, but thermionic emission increases causing charge leakage
Solution Approach 1:
Different regions of the programmable material are assigned different local qualities through varied material composition (SiNx with different x values or different materials). The first and second regions have compositions optimized for charge-blocking with higher nitrogen content or specific band structures, while the intervening region has compositions tailored to control charge passage with lower thermionic emission. This local quality differentiation allows each region to perform its specific function optimally, preventing charge loss without generating excessive thermionic emission elsewhere in the structure.
Solution Approach 2:
The patent employs parameter changes in material composition (varying nitrogen content x in SiNx from 0.5 to 3.0, or using SiOy with different y values) to control the electrical properties of different regions. By adjusting compositional parameters, the charge-blocking regions achieve high barrier heights for charge loss prevention, while the intervening region parameters are optimized to minimize thermionic emission. This parameter control through composition variation resolves the contradiction between charge-blocking effectiveness and thermionic emission reduction.
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 configuration significantly reduces thermionic emission and charge loss, leading to improved data retention and storage efficiency in memory cells, particularly in non-volatile memory applications.
Implementation Method 1
exposing the SiNx to oxygen-containing material to transform some of the SiNx to the SiOy that is directly against remaining of the SiNx
Implementation Method 2
enhances the charge-blocking and charge-passage capabilities, improving data retention and storage efficiency
Implementation Method 3
enhances the charge-blocking and charge-passage capabilities, improving data retention and storage efficiency
Data Source
AI summary
A memory cell comprises channel material, charge-passage material, programmable material, a charge-blocking region, and a control gate. The programmable material comprises at least two regions comprising SiNx having a region comprising SiOy therebetween, where “x” is 0.5 to 3.0 and “y” is 1.0 to 3.0. Methods are disclosed.