Fig. 4: Synaptic plasticity and image memorization.
From: Tetrachromatic vision-inspired neuromorphic sensors with ultraweak ultraviolet detection
EPSC of the bare SiO2 device triggered by: a an ultraweak UV light spike; b various UV illumination intensities; c various pulse widths of UV light; d 100 consecutive UV presynaptic spikes. e The retention property of different current levels for the bare SiO2 device. f EPSC of the devices with different buffer layers. g Image detection and memorization of the bare SiO2 device array with an input image of letter T. All the tests were carried out under UV light stimulation. The light pink shading regions in a–c and f represent the duration of UV light stimuli. VD and VR in 4a–f represent for the drain voltage and reading gate voltage, respectively.
