Memory Device Titanium Aluminum Oxide Layer Brookite Phase
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Solution Overview
Problem
Memory devices using titanium oxide layers face challenges in maintaining stable operations during repeated storage or erase operations, often resulting in set breakdown and failure to achieve the desired high resistance state.
Innovation Solution
A memory device structure is implemented with a first layer comprising a titanium-rich region, an aluminum-rich region, and an additional aluminum-rich region, where the titanium-rich region has a brookite crystal structure with a surface area of 58% or more, which helps in suppressing set breakdown and ensuring stable reprogram operations by adjusting the electrical resistance states.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a titanium oxide layer is used in the memory device, then the memory device can achieve resistance state changes for storage operations, but the device experiences set breakdown and unstable operations during repeated storage or erase operations
Solution Approach 1:
The patent uses a composite material structure consisting of a titanium oxide layer combined with an aluminum oxide layer. The titanium oxide layer provides the necessary resistance state changes for memory operations, while the aluminum oxide layer suppresses set breakdown and enhances operational stability. This composite structure resolves the contradiction by combining materials with complementary properties.
Solution Approach 2:
The patent applies local quality by creating distinct regions with different compositions and crystal structures within the titanium oxide layer. Specifically, it controls the brookite crystal phase content to be 58% or more of the total titanium oxide, which locally enhances the material's ability to resist set breakdown while maintaining the necessary electrical properties for memory operations.
2Duration of action of stationary object
If repeated storage or erase operations are performed, then the memory device can maintain data retention, but the device fails to achieve the desired high resistance state due to set breakdown
Solution Approach 1:
The patent implements beforehand cushioning by pre-forming the aluminum oxide layer before performing repeated storage or erase operations. This layer acts as a protective barrier that cushions against the degradation effects of repeated operations, preventing set breakdown and ensuring the device can consistently achieve and maintain the desired high resistance state throughout its operational lifetime.
3Reliability
If the titanium oxide layer is modified to suppress set breakdown, then operational stability is improved, but the device complexity increases due to additional layers and crystal structure control
Solution Approach 1:
The patent applies parameter changes by controlling the crystal structure parameters of the titanium oxide layer, specifically ensuring that the brookite crystal phase constitutes 58% or more of the total titanium oxide. This parameter control modifies the material's intrinsic properties to suppress set breakdown and improve operational stability without requiring excessively complex device architectures.
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 proposed structure enhances the breakdown voltage and achieves stable reprogram operations, reducing the occurrence of set breakdown and maintaining the desired resistance states, thereby ensuring the memory device's operational stability.
Implementation Method 1
A surface area in a first plane of a brookite region included in the first region is 58 percent or more of a surface area in the first plane of the first region
Data Source
AI summary
According to one embodiment, a memory device includes a first conductive layer, a second conductive layer, and a first layer. A direction from the first conductive layer toward the second conductive layer is aligned with a first direction. The first layer is provided between the first conductive layer and the second conductive layer. The first layer includes a first region including titanium and oxygen, a second region including aluminum and oxygen and being provided between the first conductive layer and the first region, and a third region including aluminum and oxygen and being provided between the first region and the second conductive layer. A surface area in a first plane of a brookite region included in the first region is 58 percent or more of a surface area in the first plane of the first region. The first plane crosses the first direction.