Novel Porphyrin-Containing Polymer Based Memristor for Synaptic Plasticity Simulation

Comprehensive Summary The porphyrin-based copolymer PZnTPP-SFX is designed and synthesized by alternating porphyrin and spiro[fluorene-9,9'-xanthene] via Suzuki copolymerization. A simple memristor structure of ITO/ZnTPP-SFX/AlOx/Al was fabricated by spin-coating process. The conventional synaptic plasticity is emulated using the single memristor including nonlinear transmission characteristics, spike-timing dependent plasticity and spike-rate dependent plasticity. New spike-voltage dependent plasticity is also found in the memristor which can selectively perform potentiation and depression behaviors at a unipolar voltage. Compared with the device performance of uncoordinated metalloporphyrin polymer, it was found that oxygen vacancies diffuse and migrate into PZnTPP-SFX layer with the assist of coordination metal. This study suggests that porphyrin-based polymers have great promise for synaptic simulation of artificial neural network.