A new type artificial synapse based on the organic copolymer memcapacitor

A memcapacitor device with a structure of Al/copolymer/ITO is fabricated by an organic donor-acceptor (D-A) copolymer. The device exhibits the bidirectional gradual modulation of the capacitance state, which enables it to simulate the synaptic plasticity. At first, the short-term plasticity (STP) of the synapse is realized in the device, including the paired pulse facilitation (PPF), potentiation and depression behaviors. Then the transition from STP to long-term plasticity (LTP) and the learning-forgetting-relearning behavior of the synapse is achieved by repeatedly applying voltage pulses stimulation. More inspiringly, these synaptic functions are well performed at low operating voltage of 0.1 V, the voltage is reduced by 95% to compare with the previous report. And the sensitivity can reach 50 mV, which is consistent with the action potential producing synaptic plasticity in the human brain. These results provide a powerful reference for the research of high sensitive artificial synapse with low power consumption based on memcapacitor.