Crossbar RRAM Electrodes with Large Grain Copper and Silver
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Solution Overview
Problem
Current RRAM technologies face challenges in achieving scalable, high-density, and high-speed non-volatile memory applications due to limitations in integrating resistive random access memory arrays with complementary metal oxide semiconducting (CMOS) circuits, particularly in miniaturizing the active device area and ensuring low line resistivity at smaller line widths.
Innovation Solution
The method involves depositing electrodes and metal films with large crystal grains in a crossbar array structure, utilizing highly conductive materials like copper and silver, and employing advanced processing techniques such as chemical mechanical planarization and etching to reduce electron scattering and enhance grain size, thereby achieving lower resistivity and scalability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional RRAM technologies are used, then integration with CMOS circuits is achieved, but scalability and miniaturization to 10 nanometers is limited
Solution Approach 1:
The patent changes the material parameters by using copper and silver electrodes with large grain sizes instead of conventional materials, enabling miniaturization to 10 nanometers while maintaining low resistivity and improving scalability with CMOS circuits
2Quantity of substance
If line width is reduced for high-density memory, then storage density is improved, but line resistivity increases
Solution Approach 1:
The patent changes the microstructural parameters of the electrode materials by creating large grain sizes in copper and silver films, which reduces electron scattering at grain boundaries and maintains low line resistivity even at reduced line widths for high-density storage
Solution Approach 2:
The patent uses composite electrode structures with copper or silver as the base material and incorporates specific grain structure characteristics, creating a composite material system that achieves both high storage density and low resistivity
3Reliability
If cycling endurance is improved for neuromorphic computing, then device reliability is enhanced, but device complexity increases
Solution Approach 1:
The patent changes the physical parameters of the electrode materials by optimizing grain size and crystal structure in copper and silver, which inherently improves cycling endurance for neuromorphic computing applications without requiring complex additional processing steps
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 approach enables the miniaturization of RRAM devices to 10 nanometers, improves cycling endurance, and facilitates the integration of RRAM arrays with CMOS circuits, enhancing their scalability and performance for neuromorphic computing and memory applications.
Implementation Method 1
employing advanced processing techniques such as chemical mechanical planarization and etching to reduce electron scattering and enhance grain size, thereby achieving lower resistivity
Data Source
AI summary
Embodiments of the present invention provide systems and methods for the fabrication of a crossbar array fabrication of resistive random access memory (RRAM) cells. The array structure contains large grain copper and its alloy or silver and its alloy. A metal cap and spacer are used to protect copper or silver from chemical modifications during memory cell patterning.