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Ag:SrTiO3/CuAlO2 based photoelectronic synapse for artificial vision system

Memristors are emerging and being considered to be used as candidates to realize multiple bio-synaptic plasticities and to act in the developed neuromorphic computing systems. Simulating the human visual neural network is an effective way to build a new generation of artificial visual systems and a realistic method to break the von Neumann bottleneck. In this article, we report for the first time a newly proposed and fabricated oxide-based optoelectronic synaptic device with a structure of ITO/Ag:SrTiO3/CuAlO2/ITO, and demonstrate its diverse synaptic plasticities. It is found that the device can respond light stimulation from visible to near-IR (450 nm-905 nm) wavelengths, and also can exhibit interestingly various synaptic behaviors including short-term plasticity (STP), paired-pulse facilitation (PPF), long-term plasticity (LTP) and the transition from STP to LTP, respectively. More importantly, our optoelectronic synaptic device has successfully simulated several artificial vision properties as image memory, image preprocessing and color recognition. It is worth acknowledging that our optoelectronic synaptic device has a simple structure of ITO/Ag:SrTiO3/CuAlO2/ITO and an excellent synaptic behavior, showing a potential to be used in the artificial vision and neuromorphic computing systems in the near future.