Fig. 2: Electro-chromaticity boost coding.
a EPSC in response to a −4 V input spike was read with a −0.5 V VDS. b Top-view optical micrographs at four different device states ①-④ with different device operation history as shown in (a). The comb-like region is the Au electrode, and the electrochromic feature is due to H+ ion overflow in the P3HT layer. Side view device sketches showing the distribution of ions at four different device states ①-④ as shown in (a). Arrows in the sketches indicate the drift/diffusion directions of H+ ions. c EPSCs triggered by two spikes with durations of 0.05 and 1.5 s. d Fixed sampling area on the source electrode for analyzing color change. e Chromaticity of three primary colors extracted from nine sampling points triggered by two spikes with durations of 0.05 and 1.5 s; Chromaticity changes of real color and fixed gray corresponding to different triggering events. f Under electric spikes, EPSC outputs by the ENT representing the International Morse code of letters “A” and “B”. g Under electric spikes, chromaticity outputs via ENT representing the International Morse code of letters “A” and “B”. h–j The EPSC output, gray chromaticity output distribution, and electro-chromaticity boost output distribution of 26 Morse letters; the incorrectly coded letters marked with a gray rectangle background. k Confusion matrix of extraction results according to EC, CC, and ECBC modes.
