Selenium Thin Film Based Artificial Visual Synapse Using Non-volatile Light Soaking Effect

In this study, non-volatile activation of Se thin film photovoltaic device was characterized for the self-powered artificial visual synapse applications in neuromorphic systems. Short circuit current density after light soaking treatment was characterized to compare non-voltaic activation/passivation of photovoltaic performance for TiO2/Se and ZnMgO/Se heterointerface devices. TiO2/Se and ZnMgO/Se devices respectively decreased and increased their short circuit density with increasing light soaking time. ZnMgO/Se device also showed reversible decrease after light soaking under dark condition. The self-powered artificial synapse can be developed by using the similarity between non-volatile potentiation/depression of synapse and non-volatile activation/passivation of ZnMgO/Se photovoltaic device.