Nonvolatile Memory Insulation via Ion Implantation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing nonvolatile memory devices face challenges in achieving reliable electrical insulation between memory cells, particularly in semiconductor integrated circuit devices using phase change memory elements, where insulation is crucial for efficient data storage and reduced thermal interference.
Innovation Solution
The implementation of a nonvolatile memory device structure with a chalcogenide material layer configuration, including a first, second, and third material layer portion, where the third layer portion has a higher concentration of a specific element, acting as an insulator to ensure electrical insulation between memory cells, and ion implantation is used to convert this layer into an insulating material without etching, thereby reducing manufacturing complexity and preventing damage to memory cell regions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional insulation structures are used between memory cells, then manufacturing processes become complex requiring etching steps, but this increases the risk of damage to memory cell regions and reduces manufacturing reliability
Solution Approach 1:
The patent applies preliminary action by forming the insulating layer between word lines before forming the memory cell structures. This pre-formed insulating layer serves as a built-in insulation structure that eliminates the need for subsequent etching steps to create insulation between memory cells, thereby preventing damage to memory cell regions while maintaining manufacturing simplicity
Solution Approach 2:
The insulating layer formed between word lines serves multiple functions: it provides electrical insulation between adjacent word lines during normal operation, and simultaneously serves as the insulation structure between memory cells sharing common word lines. This multi-functionality eliminates the need for separate insulation structures, reducing manufacturing complexity while ensuring reliable electrical insulation
2Reliability
If insulation structures are added between memory cells, then electrical insulation is improved, but thermal interference between cells increases due to additional material layers
Solution Approach 1:
The patent applies local quality by positioning the insulating layer specifically at the word line regions where insulation is most critical for electrical isolation, while minimizing insulation material in the memory cell active regions where thermal conduction is needed. This selective placement ensures electrical insulation where required while maintaining thermal pathways for heat dissipation
3Manufacturing precision
If etching processes are used to create insulation structures, then insulation precision is improved, but manufacturing complexity and damage risk increase
Solution Approach 1:
The insulating structure is formed preliminarily during the word line formation process using standard deposition techniques, eliminating the need for subsequent precision etching steps. This preliminary formation achieves the required insulation precision through controlled deposition rather than etching, thereby simplifying the manufacturing process and reducing damage risk
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 ensures effective electrical insulation between memory cells, concentrates the electric field for efficient current flow, and reduces thermal interference, resulting in a nonvolatile memory device with enhanced reliability and performance.
Implementation Method 1
a third wiring extending in the second direction and spaced from the second wiring in the first direction. An insulating layer includes a first portion between the second wiring and the third wiring
Implementation Method 2
ion implantation is used to convert this layer into an insulating material
Data Source
AI summary
According to one embodiment, a nonvolatile memory device includes a first wiring extending in a first direction, a second wiring extending in a second direction, a third wiring extending in the second direction and spaced from the second wiring in the first direction. An insulating layer includes a first portion between the second wiring and the third wiring, and a second portion protruding from the first portion in a third direction. A chalcogenide layer is between the first wiring and the second wiring, the first wiring and the third wiring, and also the first wiring and the insulating layer. The chalcogenide layer includes a first layer portion, a second layer portion, and a third layer portion. A concentration of a first element in the third layer portion is higher than that in the first and second layer portions.