Semiconductor Memory Cross-Point Array Thermal Insulation
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Solution Overview
Problem
Flash memory devices have lower integration degree and higher power consumption compared to DRAM devices, leading to inefficiencies in data storage, which next-generation non-volatile memory devices like PRAM, MRAM, and RRAM aim to address by improving integration and reducing power consumption, but they face challenges with thermal cross-talk in three-dimensional cross-point array structures.
Innovation Solution
The semiconductor memory device incorporates a cross-point array structure with alternately arranged protrusions and recesses on conductive lines, featuring thermal insulating plugs in the recesses to increase the heat transfer path between neighboring cells, thereby reducing thermal cross-talk and enhancing reliability and stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If a three-dimensional cross point array structure is used to increase integration degree, then the integration degree and operating efficiency are improved, but thermal cross talk between neighboring cells increases
Solution Approach 1:
The conductive lines are segmented into protrusions and recesses along their length, creating discrete sections. Memory cells are positioned only on protrusions while recesses are left empty or filled with insulating material. This segmentation physically separates adjacent cells, interrupting thermal conduction paths through the conductive lines and reducing thermal cross talk between neighboring cells.
Solution Approach 2:
Insulating material is introduced as an intermediary substance in the recesses between adjacent protrusions. This insulating layer acts as a thermal barrier that blocks heat flow from one memory cell to the next along the conductive line, thereby reducing thermal cross talk while maintaining the high integration density of the cross point array structure.
2Quantity of substance
If memory cells are densely packed to increase integration degree, then the device capacity is improved, but thermal cross talk between cells increases
Solution Approach 1:
The conductive lines are segmented into protrusions and recesses along their length, creating discrete sections. Memory cells are positioned only on protrusions while recesses are left empty or filled with insulating material. This segmentation physically separates adjacent cells, interrupting thermal conduction paths through the conductive lines and reducing thermal cross talk between neighboring cells.
Solution Approach 2:
Insulating material is introduced as an intermediary substance in the recesses between adjacent protrusions. This insulating layer acts as a thermal barrier that blocks heat flow from one memory cell to the next along the conductive line, thereby reducing thermal cross talk while maintaining the high integration density of the cross point array structure.
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 thermal cross-talk between memory cells, improving the reliability and stability of the semiconductor memory device by increasing the heat transfer path, which helps maintain data integrity even with high integration density and low cell pitch.
Implementation Method 1
a plurality of thermal insulating plugs that may be disposed in the recesses of the first conductive metal lines
Data Source
AI summary
Disclosed are a semiconductor memory device and a method of manufacturing the same. A first conductive line extends in a first direction on a substrate and has a plurality of protrusions and recesses that are alternately formed thereon. A second conductive line is arranged over the first conductive line in a second direction such that the first and the second conductive lines cross at the protrusions. A plurality of memory cell structures is positioned on the protrusions of the first conductive line and is contact with the second conductive line. A thermal insulating plug is positioned on the recesses of the first conductive line and reduces heat transfer between a pair of the neighboring cell structures in the first direction. Accordingly, the heat cross talk is reduced between the neighboring cell structures along the conductive line.