Thermal Insulation Design for Efficient Memory Cells
Here’s PatSnap Eureka !
Summary
Problems
Manufacturing high-density memory devices with small dimensions and low reset currents is challenging due to variations in process specifications and difficulties in forming small pores with tight tolerances, which affects the performance of phase change based memory materials.
Innovation solutions
A memory cell structure is developed with first and second electrodes and a memory material element surrounded by a thermal insulating layer, where the thermal insulating material is at least 10% better than the dielectric layer in terms of thermal insulation and has a similar thermal expansion coefficient to the memory material, reducing the reset current required for phase change.
TRIZ Analysis
Specific contradictions:
General conflict description:
Principle concept:
If the size of the phase change material element is reduced to minimize reset current, then the reset current magnitude is reduced, but the manufacturing precision requirements increase due to tight specifications needed for large-scale memory devices
Why choose this principle:
The patent applies local quality by creating a tapered contact structure where the contact area between the electrode and phase change material is smaller at the interface with the phase change material compared to the electrode bulk. This localized geometric modification concentrates the current density precisely where needed at the phase change material interface, enabling lower reset currents without requiring uniform size reduction throughout the entire device structure, thereby easing manufacturing precision requirements.
Principle concept:
If the size of the phase change material element is reduced to minimize reset current, then the reset current magnitude is reduced, but the manufacturing precision requirements increase due to tight specifications needed for large-scale memory devices
Why choose this principle:
The patent changes the geometric parameters of the contact structure by implementing a tapered profile with specific angle ranges (30-60 degrees). This parameter change optimizes the current density distribution and thermal confinement, allowing the device to achieve low reset current operation while maintaining manufacturability through well-defined geometric specifications that can be controlled within standard fabrication tolerances.
Application Domain
Data Source
AI summary:
A memory cell structure is developed with first and second electrodes and a memory material element surrounded by a thermal insulating layer, where the thermal insulating material is at least 10% better than the dielectric layer in terms of thermal insulation and has a similar thermal expansion coefficient to the memory material, reducing the reset current required for phase change.
Abstract
A memory cell, the memory cell includes first and second electrodes and a memory material element electrically coupling the first and second electrodes. The memory material element comprises a first memory material, such as GST, the first memory material having an electrical property that can be changed by the application of energy. A thermal insulating layer surrounds the memory material element. The thermal insulating layer comprises a second memory material. A dielectric layer separates the thermal insulating material from the memory material element. A method for making a thermally insulated memory cell device is also disclosed.