Simulation of Biologic Synapse Through Organic-Inorganic Hybrid Memristors Using Novel Ti-Based Maleic Acid/TiO2 Ultrathin Films

In this letter, biologic synaptic functions of organic-inorganic hybrid memristors using novel Ti-based maleic acid (Ti-MA)/TiO
₂
ultrathin films have been demonstrated. The memristive functional layer consists of 4-nm Ti-MA and 4-nm TiO
₂
, which was fabricated at 160° C by molecular layer deposition (MLD)/atomic layer deposition (ALD), respectively. A typical bipolar resistive switching characteristic has been confirmed in the TaN/Ti-MA/TiO
₂
/Pt bilayer memristors with the space charge limited current model. Using different electrical pulse modules, several important biologic synaptic functions such as nonlinear transmission characteristics, short-/long-term plasticity, paired-pulse facilitation, and spike-timing-dependent plasticity have been achieved. The organic-inorganic hybrid memristors of ultrathin bilayer Ti-MA/TiO
₂
derived by low temperature MLD/ALD are attractive for neuromorphic simulation and flexible neuroscience applications.