Semiconductor Memory Device Vertical Structure Design
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Solution Overview
Problem
Conventional semiconductor memory devices require large areas and high power consumption for reading and writing operations, leading to inefficiencies in scalability and increased size, particularly due to the use of planar orientations on silicon-on-insulator substrates and bulk substrates.
Innovation Solution
A semiconductor memory device design featuring memory cells arranged in a matrix with N-doped and P-doped regions, capacitively coupled to a word line, and surrounded by insulating oxide barrier walls, allowing for efficient data storage and retrieval with reduced power consumption through optimized geometry and voltage potentials.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If conventional planar orientation techniques are used on silicon-on-insulator substrates, then manufacturing simplicity is maintained, but device area and power consumption increase
Solution Approach 1:
The patent transitions from conventional planar (2D) memory cell layouts to a three-dimensional vertical structure where the body region extends vertically between source and drain regions. This dimensional change allows multiple memory cells to be stacked vertically, significantly increasing storage density per unit area while maintaining manufacturing compatibility with existing silicon-on-insulator processes.
Solution Approach 2:
The invention implements a vertical nesting arrangement where the body region is positioned between source and drain regions in the vertical dimension, with insulating oxide barrier walls nested around the structure. This nested configuration maximizes space utilization and enables higher density without increasing the lateral footprint of each memory cell.
2Device complexity
If conventional planar memory cell structures are used, then structural simplicity is maintained, but scalability and density are limited
Solution Approach 1:
The patent employs vertical stacking to achieve three-dimensional memory cell structures, enabling scalable density improvements without complicating the fundamental memory cell operation. The vertical body region configuration allows multiple cells to share common source and drain regions, improving scalability while maintaining relatively simple device physics and operation.
3Ease of operation
If conventional reading and writing techniques are used, then operational functionality is achieved, but power consumption increases
Solution Approach 1:
The patent utilizes voltage potential changes applied to the word line to control charge carrier injection into the vertical body region. By varying the voltage state of the body region through controlled injection and removal of charge carriers, the invention achieves low-power read and write operations. The vertical structure enables efficient charge carrier confinement and removal, reducing the energy required for each operation compared to conventional planar devices.
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 design enhances scalability and reduces power consumption by enabling efficient data storage and retrieval operations, improving the performance and density of semiconductor memory devices.
Implementation Method 1
a body region spaced apart from and capacitively coupled to a gate structure
Data Source
AI summary
Techniques for providing a semiconductor memory device are disclosed. In one embodiment, the techniques may be realized as a semiconductor memory device including a plurality of memory cells arranged in an array of rows and columns. Each memory cell may include a first region connected to a source line extending in a first orientation, a second region connected to a bit line extending a second orientation, and a body region spaced apart from and capacitively coupled to a word line, wherein the body region is electrically floating and disposed between the first region and the second region. The semiconductor device may also include a first barrier wall extending in the first orientation of the array and a second barrier wall extending in the second orientation of the array and intersecting with the first barrier wall to form a trench region configured to accommodate each of the plurality of memory cells.