Phase Change Memory Device Narrowing Contact Area
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Solution Overview
Problem
Phase change memory devices require minimizing the contacting area between phase change materials and conductors to achieve low operating power, as the resistance value and heating efficiency are directly related to this area, but existing methods struggle to form phase change material layers with widths of 50 nm or less effectively.
Innovation Solution
The method involves forming a phase change material layer by providing reactive radicals comprising precursors for the phase change material and nitrogen to a substrate, using techniques like atomic layer deposition or chemical vapor deposition, which allows for the formation of a phase change material layer with a width of 50 nm or less, reducing the contacting area and enhancing heating efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the contacting area between phase change material and conductor is minimized, then heating efficiency and resistance value improve, but existing methods cannot effectively form phase change material layers with widths of 50 nm or less
Solution Approach 1:
The patent changes the deposition parameters by using atomic layer deposition (ALD) with specific precursors and nitrogen reactive radicals, enabling precise control of phase change material layer width at 50 nm or less while maintaining manufacturability through controlled chemical reactions
Solution Approach 2:
The patent replaces conventional physical deposition methods with chemical vapor deposition and atomic layer deposition processes, using chemical reactions involving precursors and nitrogen radicals to form the phase change material layer, thereby achieving superior width control and reduced contacting area
2Manufacturing precision
If reactive radicals comprising precursors and nitrogen are provided to the substrate, then phase change material layers with width of 50 nm or less are formed, but deposition process complexity increases
Solution Approach 1:
The patent segments the deposition process into distinct stages: providing precursors, providing nitrogen reactive radicals, and controlling their reactions on the substrate. This segmentation enables precise width control of the phase change material layer while managing process complexity through systematic process design
Solution Approach 2:
The patent uses nitrogen reactive radicals as intermediaries that react with precursors on the substrate to form the phase change material layer. This intermediary mechanism enables precise control of layer width and composition while facilitating the deposition process through controlled chemical reactions
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 approach enables the creation of phase change memory devices with reduced contacting areas, facilitating low-power operation and improved integration by forming phase change material layers at low temperatures, resulting in higher efficiency and smaller grain sizes, thus enhancing the operational characteristics of the memory devices.
Implementation Method 1
forming a phase change material layer by providing reactive radicals comprising precursors for a phase change material and nitrogen
Implementation Method 2
using techniques like atomic layer deposition or chemical vapor deposition
Implementation Method 3
Phase change materials are capable of embodying at least two recognizably different states—for example, a crystalline state and an amorphous state
Implementation Method 4
Heating of a resistor may be achieved through an electrical signal (a current, for example) applied to both ends of the phase change material
Data Source
AI summary
Provided are a phase change memory device and a method for forming the phase change memory device. The method includes forming a phase change material layer by providing reactive radicals to a substrate. The reactive radicals may comprise precursors for a phase change material and nitrogen.