Convex Bottom Electrode with Rounded Corners for ReRAM Reliability
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional resistance switching memory devices with TiONx have limitations in structural reliability and electrical performance due to the presence of TiONx adjacent to the resistance switching layer, affecting switching characteristics.
Innovation Solution
A resistance switching memory device with a convex bottom electrode and smooth top surface, free from TiON, is developed, featuring a protruding bottom electrode with round corners and spacers surrounding its lateral sidewalls, enhancing structural reliability and electrical performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If TiONx is formed adjacent to the resistance switching layer in conventional process, then the device structure is complete, but the switching characteristics and data storage stability are degraded
Solution Approach 1:
The patent removes the harmful TiONx layer from adjacent to the resistance switching layer by modifying the manufacturing process. Specifically, the conductive barrier layer is etched back to expose the resistance switching layer, and TiONx formation is prevented in this region, thereby extracting the harmful oxidation effect from the device structure while maintaining other necessary components
Solution Approach 2:
The patent applies different treatments to different regions of the device. The conductive barrier layer is selectively etched back in the region adjacent to the resistance switching layer to prevent TiONx formation, while other regions maintain their original structure. This local modification ensures excellent electrical properties at the critical interface without compromising overall device functionality
2Reliability
If the bottom electrode has sharp corners, then the fabrication is simpler, but the electrical field distribution is uneven affecting switching characteristics
Solution Approach 1:
The patent modifies the bottom electrode geometry by rounding its corners instead of maintaining sharp edges. This curvature modification creates a more uniform electrical field distribution at the corners, preventing field concentration and improving switching characteristics. The rounded corners are achieved through controlled etching and deposition processes that shape the bottom electrode profile
3Manufacturing precision
If the top surface of the bottom electrode is rough, then the deposition process is simpler, but the interface quality with resistance switching layer is poor
Solution Approach 1:
The patent performs preliminary surface preparation of the bottom electrode before depositing the resistance switching layer. The bottom electrode surface is planarized and smoothed through controlled etching and deposition steps, creating a flat, clean interface that ensures excellent contact quality and uniform electrical properties in the subsequent resistance switching layer
Data Source
AI summary
A resistance switching memory device is provided, including an insulating layer having a top surface, a bottom electrode embedded in the insulating layer, a resistance switching layer disposed on the bottom electrode, and a top electrode formed on the resistance switching layer and covering the resistance switching layer. Also, the bottom electrode has an upper portion protruding from the top surface of the insulating layer, and the upper portion has round corners at edges.