Resistive Memory Cell Layout for Higher Write and Read Currents
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Solution Overview
Problem
Current nonvolatile memory devices integrating resistance change memory elements and selectors on semiconductor substrates face challenges in optimizing the configuration and manufacturing methods to enhance write and read currents, leading to suboptimal performance.
Innovation Solution
The memory device configuration includes a magnetoresistance effect element and a selector connected in series, with a specific electrode and selector material layer arrangement that allows for increased current passage area and thickness optimization, and a manufacturing method involving atomic layer deposition and other techniques to form a recessed selector material layer, ensuring efficient current flow and reduced electric field concentration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If a conventional memory cell configuration is used, then the device structure is simple, but the write and read currents are insufficient
Solution Approach 1:
The memory cell is segmented into distinct functional regions: a selector region with a first electrode and switching material layer, and a memory element region with a second electrode and resistance change material layer. This segmentation allows each region to be independently optimized for its specific function, enabling enhanced write and read currents while maintaining a manageable structural complexity through clear functional division.
Solution Approach 2:
The patent introduces a third dimension by forming a recess in the substrate and positioning the selector material layer within this recessed region. This vertical dimensionality change increases the effective area for current passage without expanding the planar footprint, thereby enhancing write and read currents while keeping the device footprint compact.
2Power
If the selector material layer is made thicker, then the current passage area increases, but the electric field concentration increases
Solution Approach 1:
The patent applies local quality by creating a recessed region specifically for the selector material layer, allowing this region to have different geometric properties (increased volume and surface area) compared to the surrounding planar structure. This localized geometric modification enables the selector material layer to be thicker without uniformly increasing electric field concentration across the entire device, as the recess geometry distributes the electric field more effectively.
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 and manufacturing approach result in improved write and read currents, leading to enhanced memory device performance and reliability.
Implementation Method 1
a resistance change memory element such as a magnetoresistance effect element
Implementation Method 2
a manufacturing method involving atomic layer deposition and other techniques to form a recessed selector material layer
Data Source
AI summary
According to one embodiment, a memory device includes a first memory cell, a second memory cell adjacent to the first memory cell in a first direction, and a third memory cell adjacent to the first memory cell in a second direction, each of the first, second, and third memory cells including a resistance change memory element and a switching element. The switching element includes first and second electrodes, and a switching material layer between the first and second electrodes, the first and second electrodes overlap each other when viewed from the first direction, the first electrodes in the first and second memory cells are apart from each other, and the switching material layers in the first and second memory cells are continuously provided.