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. 2020 Nov 11;6(46):eabc6389. doi: 10.1126/sciadv.abc6389

Fig. 3. Brain-like information processing, nonvolatile charge retention, and multibit-level memory functions of flexible quasi-2DEG photonic synapses.

Fig. 3

(A) Photograph of flexible quasi-2DEG photonic synapse devices based on polyimide substrates. Inset shows the corresponding SEM image of the fabricated 6 × 5 device array. Photo credits: You Meng, City University of Hong Kong. (B) Paired-pulse facilitation (PPF) behavior of a typical quasi-2DEG photonic synaptic device. (C) PPF index, defined as the ratio of A2/A1, plotted as a function of interspike time. (D) Light intensity–dependent plasticity of quasi-2DEG photonic synapses at a constant spike time of 10 ms for 10 pulses with light intensity ranging from 0.1 to 0.5 mW/cm2. (E) Pulse number–dependent plasticity of quasi-2DEG photonic synapses at a constant spike time of 10 ms and light intensity of 0.1 mW/cm2 with the pulse number ranging from 3 to 9. (F) Giant PPC phenomenon in InGaO3(ZnO)3 superlattice NW arrays with the nonvolatile charge retention time using logarithm y coordinate and (inset) linear y coordinate. (G to I) Multibit storage properties of InGaO3(ZnO)3 superlattice NW arrays with more than 400 conductance states are continuously programed by laser pulses.