Skip to main content
U.S. Department of Energy
Office of Scientific and Technical Information

Inherent stochasticity during insulator–metal transition in VO2

Journal Article · · Proceedings of the National Academy of Sciences of the United States of America
Vanadium dioxide (VO2), which exhibits a near-room-temperature insulator–metal transition, has great potential in applications of neuromorphic computing devices. Although its volatile switching property, which could emulate neuron spiking, has been studied widely, nanoscale studies of the structural stochasticity across the phase transition are still lacking. In this study, using in situ transmission electron microscopy and ex situ resistive switching measurement, we successfully characterized the structural phase transition between monoclinic and rutile VO2 at local areas in planar VO2/TiO2 device configuration under external biasing. After each resistive switching, different VO2 monoclinic crystal orientations are observed, forming different equilibrium states. We have evaluated a statistical cycle-to-cycle variation, demonstrated a stochastic nature of the volatile resistive switching, and presented an approach to study in-plane structural anisotropy. Furthermore, our microscopic studies move a big step forward toward understanding the volatile switching mechanisms and the related applications of VO2 as the key material of neuromorphic computing.
Research Organization:
Brookhaven National Laboratory (BNL), Upton, NY (United States); Pennsylvania State Univ., University Park, PA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
SC0012704; SC0020145
OSTI ID:
1823599
Alternate ID(s):
OSTI ID: 1823611
OSTI ID: 1880813
Report Number(s):
BNL--222210-2021-JAAM
Journal Information:
Proceedings of the National Academy of Sciences of the United States of America, Journal Name: Proceedings of the National Academy of Sciences of the United States of America Journal Issue: 37 Vol. 118; ISSN 0027-8424
Publisher:
National Academy of SciencesCopyright Statement
Country of Publication:
United States
Language:
English

References (44)

Doping of VO2 thin films by ion implantation journal July 1977
Nanoscale Imaging and Control of Volatile and Non‐Volatile Resistive Switching in VO 2 journal November 2020
Channel noise in neurons journal March 2000
High-throughput electronic band structure calculations: Challenges and tools journal August 2010
Python Materials Genomics (pymatgen): A robust, open-source python library for materials analysis journal February 2013
Band structure diagram paths based on crystallography journal February 2017
Strain-Induced Self Organization of Metal−Insulator Domains in Single-Crystalline VO 2 Nanobeams journal October 2006
Symmetry Relationship and Strain-Induced Transitions between Insulating M1 and M2 and Metallic R phases of Vanadium Dioxide journal November 2010
Mesoscopic Metal−Insulator Transition at Ferroelastic Domain Walls in VO 2 journal July 2010
Photoresponse of a strongly correlated material determined by scanning photocurrent microscopy journal October 2012
Recent progress in the phase-transition mechanism and modulation of vanadium dioxide materials journal July 2018
Biological plausibility and stochasticity in scalable VO2 active memristor neurons journal November 2018
Understanding memristive switching via in situ characterization and device modeling journal August 2019
Versatile stochastic dot product circuits based on nonvolatile memories for high performance neurocomputing and neurooptimization journal November 2019
Non-thermal resistive switching in Mott insulator nanowires journal June 2020
Subthreshold firing in Mott nanodevices journal May 2019
In-memory computing with resistive switching devices journal June 2018
Threshold switching memristor-based stochastic neurons for probabilistic computing journal January 2021
Stochastic memristive devices for computing and neuromorphic applications journal January 2013
Nanoscale resistive switching devices: mechanisms and modeling journal January 2013
Enhanced hysteresis in the semiconductor-to-metal phase transition of VO2 precipitates formed in SiO2 by ion implantation journal November 2001
Nanoscale imaging and control of resistance switching in VO2 at room temperature journal May 2010
Commentary: The Materials Project: A materials genome approach to accelerating materials innovation journal July 2013
Challenges in materials and devices for resistive-switching-based neuromorphic computing journal December 2018
Operando characterization of conductive filaments during resistive switching in Mott VO 2 journal February 2021
Self-Consistent Equations Including Exchange and Correlation Effects journal November 1965
Current-Driven Insulator-To-Metal Transition in Strongly Correlated VO 2 journal January 2019
Spinodal electronic phase separation during insulator-metal transitions journal November 2020
Metal-insulator transition in vanadium dioxide journal June 1975
Ab initiomolecular dynamics for liquid metals journal January 1993
Projector augmented-wave method journal December 1994
Efficient iterative schemes for ab initio total-energy calculations using a plane-wave basis set journal October 1996
Large kinetic asymmetry in the metal-insulator transition nucleated at localized and extended defects journal June 2011
Comprehensive picture of VO 2 from band theory journal August 2012
Effect of disorder on the metal-insulator transition of vanadium oxides: Local versus global effects journal May 2015
Resistive asymmetry due to spatial confinement in first-order phase transitions journal July 2018
Multiple Avalanches across the Metal-Insulator Transition of Vanadium Oxide Nanoscaled Junctions journal July 2008
Oxides Which Show a Metal-to-Insulator Transition at the Neel Temperature journal July 1959
Generalized Gradient Approximation Made Simple journal October 1996
Phase-field model of insulator-to-metal transition in VO 2 under an electric field journal May 2018
Stochastic Insulator-to-Metal Phase Transition-Based True Random Number Generator journal January 2018
Oxide Electronics Utilizing Ultrafast Metal-Insulator Transitions journal August 2011
Ginzburg-Landau theory of metal-insulator transition in VO 2 : The electronic degrees of freedom journal November 2017
Stochastic Ion Channel Gating in Dendritic Neurons: Morphology Dependence and Probabilistic Synaptic Activation of Dendritic Spikes journal August 2010