Synaptic electronic devices with electrochromic device

A method for making a synaptic electronic device, the method comprising:

• forming an electrochromic stack and a photoresistor on a semiconductor substrate, the photoresistor confined to a single layer and arranged between the semiconductor substrate and the electrochromic stack, and the electrochromic stack disposed directly on the photoresistor, the electrochromic stack switching between bleached and colored states when exposed to light, the electrochromic stack consisting of a first transparent electrode layer, a cathodic electrochromic layer, a solid electrolyte layer, an anodic electrochromic layer, and a second transparent electrode layer;
• and
• forming a pair of electrodes directly on a top surface of the photoresistor and at opposing ends of the photoresistor, such that each electrode of the pair of electrodes extends continuously from a bottom surface of the electrochromic stack to a top surface of the electrochromic stack.