Fig. 1. Schematic diagram of biological synapse and device structure

Fig. 2. AFM diagram before and after adding PVN layer

Fig. 3. Comparison of ferroelectric synaptic and ferroelectric/electret synaptic transfer curves

Fig. 4. Schematic diagram of how a ferroelectric/electret synapse works

Fig. 5. Pulse enhancement of the ferroelectric/electret synapse

Fig. 6. Pulse suppression of ferroelectric/electret synapses

Fig. 7. Performance of ferroelectric/electret synapses under light exposure