Trench Semiconductor Memory with Metal Oxide Layers
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Solution Overview
Problem
Current semiconductor devices face challenges in miniaturization, low power consumption, and high performance due to limitations in variable resistance elements used in memory circuits, particularly in achieving reliable and efficient switching between resistance states.
Innovation Solution
The development of an electronic device with a semiconductor memory that includes a first metal oxide layer with lower thermal conductivity and varying oxygen content, combined with a selector layer using MIT and OTS materials, and a top electrode, which allows for improved thermal management and resistance switching by utilizing a trench structure and specific metal oxide layers like tantalum or titanium oxide.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If conventional variable resistance elements are used in memory circuits, then device miniaturization is pursued, but thermal management and switching reliability deteriorate
Solution Approach 1:
The patent applies local quality by creating a trench structure with specific metal oxide layers (first metal oxide layer with lower thermal conductivity, second metal oxide layer with insufficient oxygen) positioned locally around the selector. This localized structural modification improves thermal management and switching reliability in the critical region without increasing overall device volume, thereby resolving the contradiction between miniaturization and reliability.
Solution Approach 2:
The patent employs composite materials by combining different metal oxide layers with distinct properties (thermal conductivity, oxygen content) and selector materials (MIT, OTS, niobium oxide, vanadium oxide) within the same memory structure. This composite approach enables simultaneous optimization of thermal management, electrical switching characteristics, and device compactness, addressing the contradiction between size reduction and performance maintenance.
2Ease of manufacture
If variable resistance elements with uniform composition are used, then manufacturing is simplified, but switching efficiency and resistance state differentiation deteriorate
Solution Approach 1:
The patent implements local quality by introducing a second metal oxide layer with insufficient oxygen content specifically at the interface region with the selector, while maintaining a first metal oxide layer with stoichiometric composition elsewhere. This localized compositional variation enhances switching efficiency through improved resistance state differentiation at the critical interface, while the overall layered structure remains compatible with standard manufacturing processes.
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 enhances the characteristics of variable resistance elements, improving the reliability and yield of semiconductor memory devices, enabling efficient data storage and processing in various electronic devices and systems.
Implementation Method 1
The first metal oxide layer comprises a material having lower thermal conductivity than the selector
Implementation Method 2
The selector comprises MIT (Metal Insulator Transition) of OTS (Ovonic Threshold Switch)
Implementation Method 3
The selector comprises MIT (Metal Insulator Transition) of OTS (Ovonic Threshold Switch)
Implementation Method 4
The second metal oxide layer contains an insufficient amount of oxygen with respect to a stoichiometric ratio
Data Source
AI summary
Provided is an electronic device including a semiconductor memory. The semiconductor memory includes a first metal oxide layer disposed over a substrate and including a trench therein, a second metal oxide layer disposed along an inner wall of the trench, a selector disposed over the second metal oxide layer and buried in a part of the trench, and a top electrode disposed over the selector.