Emulating the short-term plasticity of a biological synapse with a ruthenium complex-based organic mixed ionic–electronic conductor

Abstract

Short-term plasticity (STP) is a phenomenon in the biological brain where synaptic weight changes depending solely on the presynaptic activity in a biological brain. The STP is an essential brain...

Synapse-Mimicking Memristors Based on 3,6-Di(tpy)-9-Phenylcarbazole Unimer and Its Copolymer with Cobalt(II) Ions

“…The values obtained for our system were comparable to those for biological synapses. Similar results were reported by Shin S. et al [48] for a memristor with an active layer made of a ruthenium-complex-based organic compound with a mixed ionic-electronic conductivity, although, in this case, a high concentration of a salt was needed to observe the PPF phenomena, which suggests that the presence of ions plays an important role in the memristor's synaptic plasticity. the application of the first trigger pulse was indicated by A1 and the current after the second trigger pulse by A2, the PPF/D index was obtained as the ratio (A2−A1)/A1.…”

“…Paired pulse facilitation and depression are two functions of biological synapses; the former one occurs as a rapid phase, lasting tens of milliseconds, and the latter is a slower phase lasting hundreds of milliseconds. The values of the time constants that were achieved for the device with a Au and Ga TE were comparable to those measured in biological synapses ( Figure 8 b and Figure S17 ) [ 43 , 48 ]. In addition, the observed memory transitions from STM to LTM and from STF to LTF ( Figure 7 ) can allow these memristors to be used for studying brain-inspired neuromorphic systems [ 5 ].…”

An extremely low-power-consumption reconfigurable two-dimensional tellurene artificial synapse for bio-inspired wearable edge computing

“…The strength of PPF in the artificial platform steadily weakened with the increase in Δ t . The short-term plasticity strength of the flexible 2D Te artificial synaptic transistors clearly belongs to the following double exponential decay equation: 56 where Δ t represents the time interval between A 1 and A 2 . C 1 and C 2 represent the initial facilitation magnitudes of the fast and slow phases, respectively.…”

The impact of oxygen vacancy defect density on the nonlinearity and short-term plasticity of TiO2-based exponential selector

“…In addition, in our previous work, the short-term plasticity of the Pt/TiO x /Pt exponential selector was demonstrated to enable the stimulation ratedependent weight tuning in the one selector-one RRAM (1S1R) synapse [18]. Samuel Shin et al tuned the short-term plasticity of an organic mixed ionic-electronic conductor memristor by adding LiClO 4 salts [19]. Yewon Lee et al implemented both short-term and long-term memory in Ag/ HfO 2 /SiO 2 /Si memristor by controlling the strength of the applied signal [20].…”