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- Title
Correlation between oxygen vacancies and neuromorphic properties of pulsed laser-deposited bismuth iron oxide artificial synapses.
- Authors
Dayal, G.; Jinesh, K. B.
- Abstract
By depositing BiFeO3 (BFO) films using reactive pulsed laser deposition (RPLD) in the presence of different oxygen pressures, the density of oxygen vacancies in the films could be varied, as shown by X-ray photoelectron spectroscopy (XPS) measurements. Synaptic devices were fabricated by depositing the BFO on fluorine-doped tin oxide (FTO) substrates and with gold (Au) as the top electrode; the device configuration was FTO/BFO/Au. An approximate quantification of the defect density was estimated by the space-charge limited current (SCLC) measurements. The synaptic weight measured for a set of devices with different oxygen vacancies appeared to increase with an increasing number of oxygen vacancies in the material. However, the larger the defect density, the larger the timescale of the spike-timing-dependent plasticity (STDP), which is explained by the time taken for the oxygen vacancies to reach thermal and electrostatic equilibrium. The nonlinearity factor was calculated for the synaptic response of the device, showing that the nonlinearity of paired-pulse facilitation (PPF) decreases with an increase in the defect density. This study demonstrates that the neuromorphic properties of artificial synaptic devices can be effectively tuned by adjusting the defect density in the active material.
- Subjects
BISMUTH iron oxide; IRON oxides; BISMUTH; PULSED laser deposition; X-ray photoelectron spectroscopy; THERMAL equilibrium; SYNAPSES
- Publication
Applied Physics A: Materials Science & Processing, 2023, Vol 129, Issue 11, p1
- ISSN
0947-8396
- Publication type
Article
- DOI
10.1007/s00339-023-07060-8