Fig. 2: Structure and photoconductivity of the RAO processor.
From: Non-volatile rippled-assisted optoelectronic array for all-day motion detection and recognition
a Structure of the RAO processor. b Transfer curves evolution with changing the ranges of the sweeping gate voltages at VDS = 0.5 V, which indicates a remarkable memory effect of the RAO processor. IDS and VGS denote the drain current and gate voltage respectively. c Cumulative positive and negative photoconductivity with progressive multilevel states under periodic 5 ms optical pulses both with 1 s intervals. The red curve represents the NV-negative photocurrent and the blue curve represents the NV-positive photocurrent. d Extracted cumulative NV-photocurrent and the linear fitting. The R-square values are 0.9995 and 0.99658 for NV-PPC and NV-NPC, respectively. e, f 28 discrete conductance states of both NV-PPC and NV-NPC excited by the same optical pulse, which shows the accurate programmability for weight training. g, h Conductance at each state under continuously periodic light stimuli for stabilization test of both NV-NPC and NV-PPC. The distribution of a certain state from 50 periods is shown in the insets. i–p Colour mapping of both cumulative NV-PPC and NV-NPC. i, k, m, o represent the NV-PPC and (j, l, n, p) represent the NV-NPC, as (i, j) with 405 nm laser, (k, l) with 520 nm laser, (m, n) with 638 nm laser and (o, p) with 940 nm laser. Source data are provided as a Source Data file.
