Cu-Doped Sb-Te Phase Change Material for Memory Stability and Speed
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Solution Overview
Problem
The Sb—Te phase change memory system faces challenges with poor amorphous stability and slow crystallization speed, making it difficult to achieve compatibility between data retention and writing speed, which hinders its commercial application.
Innovation Solution
Doping the Sb—Te system with Cu to form Cu3Te2 bonds with both tetrahedral and octahedral structures, enhancing amorphous stability and crystallization speed, thereby improving the compatibility of the phase change memory.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the Sb—Te system is doped with fourth main group element to improve amorphous stability, then data retention ability is improved, but crystallization speed is decreased
Solution Approach 1:
The patent changes the doping element from fourth main group element to Cu element, which has different valence and bonding characteristics. This parameter change allows the formation of Cu3Te2 bonds with both tetrahedral and octahedral structures, enabling simultaneous improvement of amorphous stability and crystallization speed, thereby resolving the contradiction between data retention ability and crystallization speed.
Solution Approach 2:
The patent creates a composite structure within the Sb—Te system by introducing Cu dopant that forms Cu3Te2 bonds with both tetrahedral and octahedral configurations. This composite atomic structure combines the stability-enhancing tetrahedral clusters with the crystallization-promoting octahedral arrangements, achieving both improved amorphous stability and maintained crystallization speed.
2Speed
If the Sb—Te system uses fast crystallization process to achieve fast SET speed, then writing speed is improved, but amorphous stability deteriorates
Solution Approach 1:
The patent introduces Cu element as a dopant that changes the bonding characteristics of the Sb—Te system. The Cu3Te2 bonds with both tetrahedral and octahedral structures provide both fast crystallization capability for SET operation and enhanced amorphous stability for data retention, thus resolving the contradiction between SET speed and amorphous stability.
Solution Approach 2:
The Cu element acts as an intermediary that mediates between the conflicting requirements of fast crystallization and amorphous stability. By forming Cu3Te2 bonds with dual tetrahedral-octahedral structures, the Cu dopant facilitates rapid crystallization during SET operations while simultaneously stabilizing the amorphous state during data retention, thus resolving the speed-stability contradiction.
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 Cu-doped Sb—Te system achieves improved amorphous stability and crystallization speed, facilitating the commercial application of phase change memory by balancing speed and stability, with a significant increase in crystallization temperature and set speed performance.
Implementation Method 1
the phase change material undergoes a reversible phase transition between an amorphous state and a polycrystalline state
Implementation Method 2
The amorphous phase change memory material undergoes an annealing-like process to crystallize and return to a low resistance state
Implementation Method 3
The fourth main group element can form a tetrahedral structure with itself as the center after being doped into the Sb—Te system. In the amorphous state, the structure of strongly bonded tetrahedral clusters is considerably different from that of the Sb—Te crystal (octahedral), which hinders the spontaneous crystallization of phase change materials
Implementation Method 4
An electric pulse with a narrow pulse width and high amplitude as a RESET operation are respectively applied and performed on the device unit. The crystalline phase change memory material melts, rapidly cools, and transforms into an amorphous disordered state
Data Source
AI summary
A Cu-doped Sb2Te3 system phase change material, a phase change memory, and a preparation method thereof belonging to the technical field of micro-nano electronics are provided. A Sb—Te system phase change material is doped with Cu element to form Cu3Te2 bonds with both tetrahedral and octahedral structures in the case of local enrichment of Cu. The strongly bonded tetrahedral structure improves the amorphous stability and data retention capability of the Sb—Te system phase change material, and the octahedral structure of the crystal configuration improves the crystallization speed of the Sb—Te system phase change material. A phase change memory including the phase change material and a preparation method of the phase change material are also provided. Through the phase change material provided by the invention, both the speed and amorphous stability of the device are improved, and the comprehensive performance of the phase change memory is also enhanced.