3D Vertical Channel Memory Integration Density Oxidation Control
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Solution Overview
Problem
Conventional two-dimensional semiconductor memory devices have limited integration density due to the high cost and complexity of forming fine patterns, which restricts their performance and cost-effectiveness.
Innovation Solution
The development of semiconductor memory devices with vertically arranged memory cells, utilizing a method that includes forming alternating layers of insulating and sacrificial layers on a substrate, creating vertical channel structures, and applying specific oxidation and diffusion inhibiting layers to enhance integration density and electrical characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional two-dimensional memory devices use fine pattern formation techniques to increase integration density, then integration density is improved, but manufacturing cost and process complexity increase significantly
Solution Approach 1:
The patent transitions from two-dimensional planar memory cell structures to three-dimensional vertically stacked structures. Multiple memory cells are stacked along the vertical direction, allowing integration density to increase without requiring finer lateral patterning. This dimensional change resolves the contradiction by achieving higher density through vertical stacking rather than lateral miniaturization, thereby reducing the complexity of fine pattern formation processes.
2Manufacturing precision
If conventional two-dimensional memory devices use fine pattern formation techniques to increase integration density, then integration density is improved, but manufacturing cost increases due to need for extremely high-priced apparatuses
Solution Approach 1:
By stacking memory cells vertically in the third dimension, the patent achieves higher integration density using standard lithographic patterning processes rather than requiring extremely high-priced apparatuses for fine lateral patterning. The vertical stacking approach uses conventional manufacturing tools to create multi-layer structures, thereby reducing manufacturing cost while improving integration density.
3Manufacturing precision
If vertical channel structures are formed to increase integration density, then integration density is improved, but oxidation control becomes more difficult
Solution Approach 1:
The patent applies different oxidation characteristics to different regions of the vertical channel structure. By controlling oxidation locally at various heights and positions within the stacked memory cells, the invention achieves proper oxide layer formation for electrical isolation and device operation while maintaining high integration density. This local quality control resolves the contradiction between vertical stacking and oxidation management.
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 increases integration density and improves electrical characteristics, enabling more efficient and cost-effective semiconductor memory devices by reducing the complexity of pattern formation and enhancing reliability.
Implementation Method 1
forming an oxidation inhibiting layer in or on the substrate exposed by the first recess region
Implementation Method 2
forming a buffer oxide layer on the oxidation inhibiting layer
Data Source
AI summary
Inventive concepts provide semiconductor memory devices and methods of fabricating the same. A stack structure and vertical channel structures are provided on a substrate. The stack structure includes insulating layers and gate electrodes alternately and repeatedly stacked on the substrate. A first vertical channel pattern is disposed in a lower portion of each vertical channel structure. A gate oxide layer is formed on a sidewall of the first vertical channel pattern. A recess region is formed in the substrate between the vertical channel structures. A buffer oxide layer is formed in the recess region. An oxidation inhibiting layer is provided in the substrate to surround the recess region. The oxidation inhibiting layer is in contact with the buffer oxide layer and inhibits growth of the buffer oxide layer.