3D Memory Vertical Channel Integration Density
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Solution Overview
Problem
Conventional two-dimensional semiconductor memory devices have limited integration density due to high costs associated with fine-pattern forming technologies, which restricts their performance and cost-effectiveness.
Innovation Solution
A three-dimensional semiconductor device is designed with vertical channel structures on a semiconductor substrate, a P-type semiconductor layer, and a common source line doped with N-type impurities, which reduces resistance and enhances integration density by allowing effective use of the semiconductor substrate area.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If two-dimensional semiconductor memory devices use fine-pattern forming technologies to increase integration density, then integration density is improved, but manufacturing cost increases significantly
Solution Approach 1:
The patent transitions from two-dimensional planar memory cell arrangement to three-dimensional vertical channel structures. Multiple memory cells are stacked vertically above a common source line, enabling higher integration density without requiring finer lateral patterning. This vertical stacking approach achieves increased capacity while avoiding the need for extremely expensive fine-pattern forming apparatus.
2Quantity of substance
If three-dimensional vertical channel structures are implemented to increase integration density, then integration density is improved, but resistance between common source line and vertical channel structures increases
Solution Approach 1:
The patent introduces a P-type semiconductor layer as an intermediary between the N-type common source line and the vertical channel structures. This P-type layer forms a pn-junction that reduces contact resistance and improves electrical connection reliability. The intermediary layer facilitates efficient charge carrier transport between the common source line and the vertical channels, solving the resistance issue inherent in direct three-dimensional contacts.
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 solution increases integration density and reduces resistance between the common source line and vertical channel structures, improving the reliability and performance of semiconductor memory devices while lowering operational costs.
Implementation Method 1
a common source line disposed at the semiconductor substrate between the vertical channel structures to be contact with the P-type semiconductor layer. In some embodiments, the common source line may be doped with N-type impurities.
Data Source
AI summary
A three-dimensional semiconductor device includes a semiconductor substrate, vertical channel structures arranged on the semiconductor substrate in a matrix, a P-type semiconductor layer disposed at the semiconductor substrate to be in direct with the vertical channel structures, and a common source line disposed at the semiconductor substrate between the vertical channel structures. The common source line may be in contact with the P-type semiconductor layer.