Journal
ADVANCED ELECTRONIC MATERIALS
Volume 8, Issue 6, Pages -Publisher
WILEY
DOI: 10.1002/aelm.202101392
Keywords
defects; electrical properties; ferroelectric memristors; resistive switching; thin films
Funding
- NNSA's Laboratory Directed Research and Development Program
- Center for Integrated Nanotechnologies, an Office of Science User Facility operated for the U.S. Department of Energy Office of Science
- Triad National Security, LLC for the U.S. Department of Energy's NNSA [89233218CNA000001]
- U.S. National Science Foundation [ECCS-1902623, ECCS-1902644]
- EPRSC [EP/T012218/1]
- Royal Academy of Engineering [CIET 1819 24]
- Office of Science Graduate Student Research Program
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This article discusses the advancement of non-volatile memory in information technology and highlights the potential of memristors. By comparing memristors made from different stoichiometry of ferroelectric materials, it provides new insights into understanding the switching mechanism and the rotation direction of current-voltage hysteresis loop of memristors.
Advancement of information technology requires low power, high speed, and large capacity non-volatile memory. Memristors have potential applications for not only information storage but also neuromorphic computation. Memristive devices are mostly focused on the use of binary oxides as the resistive switching materials. On the other hand, polarization assisted memristive devices based on ternary ferroelectric oxides are attracting more attention due to their unique switching properties. However, the underlying switching mechanisms and the current-voltage rotation direction are still not fully understood yet. By comparing stoichiometric BaTiO3, BiFeO3, and Bi1-xFeO3-delta ferroelectric memristors with different cation stoichiometry, it is found that off-stoichiometry-induced traps can play a critical role in controlling the ferroelectric memristive switching behavior. Ferroelectrics with slight off-stoichiometry show greatly enhanced switching properties, and the switching on/off ratio is mainly determined by the trap energy levels and concentrations. The rotation direction of current-voltage hysteresis loop is affected by the defects, which can be controlled by synthesis and power dissipation. These findings provide insight in understanding the role of defects in ferroelectric memristors and offer guidance to design ferroelectric memristors with enhanced performance.
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