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Three-Dimensional Networked Nanoporous Ta2O(5-x) Memory System for Ultrahigh Density Storage.
Gunuk Wang1, Jae-Hwang Lee2, Yang Yang
1KU-KIST Graduate School of Converging Science and Technology, Korea University , 145, Anam-ro, Seongbuk-gu, Seoul 136-701, Republic of Korea.
Nano Letters
|August 8, 2015
Summary
Researchers developed a novel 3D nanoporous tantalum oxide memory system with graphene for ultrahigh-density storage. This system shows excellent performance and scalability for future nonvolatile memory applications.
Area of Science:
- Materials Science
- Electrical Engineering
- Nanotechnology
Background:
- Oxide-based resistive memory systems offer significant potential for nonvolatile memory applications.
- Current challenges include achieving ultrahigh storage density and efficient device operation.
Purpose of the Study:
- To introduce a novel memory system utilizing a 3D networked nanoporous (NP) Ta2O5-x structure and graphene.
- To demonstrate ultrahigh density storage capabilities and analyze device switching characteristics.
Main Methods:
- Fabrication of a 3D networked nanoporous Ta2O5-x structure integrated with graphene.
- Characterization of the device's current-voltage (I-V) switching behavior, leakage current, and endurance.
- Computational analysis of the memory architecture's scalability.
Main Results:
- The memory system exhibits self-embedded nonlinear I-V switching with very low leakage current (pA range) and good endurance.
- Calculations suggest scalability to a ~162 Gbit crossbar array without selectors or diodes.
- Switching characteristics are systematically controllable via applied set voltage.
Conclusions:
- The 3D NP Ta2O5-x and graphene memory system offers a promising route to ultrahigh-density nonvolatile memory.
- The observed switching mechanism involves the modulation of Schottky and Ohmic-like contacts via oxygen vacancy and ion movement.
- This architecture presents a viable solution for next-generation memory devices.
