Electromechanical Switch for High-Density DRAM Stacking
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Dynamic Random Access Memory (DRAM) faces challenges in increasing density due to issues such as short channel or junction leakage when MOS transistors are miniaturized, and stacking memory cells leads to increased thickness from semiconductor substrates.
Innovation Solution
A memory device with an electromechanical switch featuring a movable electrode that connects to a storage node, allowing for efficient charge transfer and storage, using a substrate like glass, semiconductor, or plastic, and a beam line that moves to connect with a capacitor when energized, reducing the need for additional switch elements and allowing for stacked memory cell arrays without intermediate substrates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If MOS transistors are miniaturized to increase DRAM density, then memory density is improved, but short channel or junction leakage increases
Solution Approach 1:
The patent replaces the MOS transistor switch with an electromechanical switch consisting of a movable beam electrode that physically contacts the storage node. This mechanical switching mechanism eliminates the semiconductor junction leakage problems inherent in miniaturized MOS transistors while maintaining the switching function necessary for DRAM operation.
Solution Approach 2:
The switch employs a movable beam electrode that can dynamically change position between contacting and non-contacting states with the storage node. This dynamic mechanical movement allows the switch to be controlled by voltage application to the word line, enabling reliable on/off switching without the leakage issues of static semiconductor junctions.
2Quantity of substance
If multiple layers of memory cells are stacked to increase density, then memory density is improved, but thickness increases due to semiconductor substrates
Solution Approach 1:
The patent enables vertical stacking of multiple memory cell layers by eliminating the need for intermediate semiconductor substrates between layers. The electromechanical switch structure allows memory cells to be stacked in the vertical dimension without requiring thick substrate separation, thus increasing density while controlling overall device thickness.
3Ease of operation
If MOS transistors are used in memory cells, then switching function is achieved, but semiconductor substrate is required which increases thickness
Solution Approach 1:
The patent replaces the semiconductor-based MOS transistor with a mechanically actuated switch where a movable beam electrode contacts the storage node. This eliminates the requirement for semiconductor substrates and associated thick intermediate layers, achieving the switching function through pure mechanical movement controlled by electric fields.
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 solution enables high package density, reduced size, and low junction leakage, maintaining charge retention while allowing for the use of various substrates, including non-silicon based ones, and supports the stacking of multiple memory cell arrays.
Implementation Method 1
the first portion moves to connect to the storage node when the second electrode is energized
Data Source
AI summary
A memory device includes a storage node, a first electrode, and a second electrode formed in a memory cell, the storage node stores electrical charges, the first electrode comprising a first portion electrically connected to a second portion, the first portion moves to connect to the storage node when the second electrode is energized.