Nitrogen-Containing Resistance Layer Memory Element
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Solution Overview
Problem
Existing memory elements face challenges in retention characteristics and repetitive operation characteristics, particularly when storing resistance values over time and under varying conditions, such as high temperature, due to changes in resistance values and voltage requirements.
Innovation Solution
A memory element configuration with an ion source layer containing metallic elements like Zr, Cu, and Ge, and a resistance change layer including tellurium and nitrogen, which allows for controlled resistance changes through voltage pulses, maintaining satisfactory retention and improving repetitive operation characteristics by suppressing component diffusion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a memory element uses a conventional ion conductor (solid solution of chalcogen element and metal) to achieve resistance change for information storage, then the memory element can store information nonvolatently, but the resistance value changes over time and under temperature variations, leading to poor information retention
Solution Approach 1:
The patent changes the chemical composition parameters of the resistance change layer by introducing nitrogen-containing compounds (such as aluminum nitride, silicon nitride, or their mixtures with chalcogenides). This compositional modification fundamentally alters the stability characteristics of the layer, enabling it to maintain constant resistance values over time and under temperature variations while still allowing for controllable resistance changes during write operations.
Solution Approach 2:
The patent employs composite materials in the resistance change layer by combining nitrogen-containing compounds (aluminum nitride, silicon nitride) with chalcogenide compounds (AsS, GeS, GeSe). This composite structure leverages the stability of nitride compounds and the resistive switching properties of chalcogenides, achieving both reliable information retention and functional performance.
2Reliability
If a memory element uses GdOx as the resistance change layer to store resistance changes, then information can be stored, but relatively high voltage levels are required for erasing operations and data retention characteristics show large variations
Solution Approach 1:
The patent modifies the material parameters of the resistance change layer by using nitrogen-containing compounds and their composites, which have different electrical and chemical properties compared to GdOx. This enables lower operating voltages for erasing operations while achieving more stable and consistent data retention characteristics with reduced variation.
3Use of energy by moving object
If a memory element uses a chalcogen element-containing layer to reduce operating voltage, then voltage requirements are lowered, but retention characteristics and repetitive operation characteristics are not sufficiently improved
Solution Approach 1:
The patent creates a composite resistance change layer combining nitrogen-containing compounds (aluminum nitride, silicon nitride) with chalcogenide compounds. This composite structure maintains the low operating voltage advantage of chalcogenides while adding the stability and reliability of nitride compounds, thereby simultaneously achieving low voltage operation and improved retention characteristics.
Solution Approach 2:
By adjusting the compositional parameters of the composite resistance change layer (ratios of aluminum nitride to AsS, silicon nitride to GeS, etc.), the patent optimizes both the operating voltage and retention characteristics, achieving a balance that satisfies both low voltage operation and reliable data retention.
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 memory element achieves stable resistance value retention and improved repetitive operation characteristics by using a nitrogen-containing resistance change layer, ensuring reliable data storage and reduced voltage requirements.
Implementation Method 1
dispersion of the metal in the electrode as ions into the ion conductor, thereby changing the electrical characteristics such as the resistance value or the capacitance of the ion conductor
Implementation Method 2
there is a disadvantage of failing in information retention because the resistance value shows a change
Data Source
AI summary
A memory element includes: a memory layer disposed between a first electrode and a second electrode. The memory layer includes: an ion source layer containing one or more metallic elements, and one or more chalcogen elements of tellurium (Te), sulfur (S), and selenium (Se); and a resistance change layer disposed between the ion source layer and the first electrode, the resistance change layer including a layer which includes tellurium and nitrogen (N) and is in contact with the ion source layer.