Synaptic Plasticity and Metaplasticity of Biological Synapse Realized in a KNbO3 Memristor for Application to Artificial Synapse

Tae Ho Lee, Hyun Gyu Hwang, Jong Un Woo, Dae Hyeon Kim, Tae Wook Kim, Sahn Nahm

Research output: Contribution to journalArticlepeer-review

36 Citations (Scopus)


Amorphous KNbO3 (KN) films were grown on a TiN/SiO2/Si substrate to synthesize a KN memristor as a potential artificial synapse. The Pt/KN/TiN memristor exhibited typical and reliable bipolar switching behavior with multiple resistance levels. It also showed the transmission properties of a biological synapse, with a good conductance modulation linearity. Moreover, the KN memristor can emulate various biological synaptic plasticity characteristics including short-term plasticity, long-term plasticity, spike-rate dependent plasticity, paired-pulse facilitation, and post-tetanic potentiation by controlling the number and rate of the potentiation spike. Spike-timing-dependent plasticity (STDP), which is an essential property of biological synapses, is also realized in the KN memristor. The synaptic plasticity of the KN memristor can be explained by oxygen vacancy movement and oxygen vacancy filaments. The metaplasticity of biological synapses was also implemented in the KN memristor, including the metaplasticity of long-term potentiation and depression, and of STDP. Therefore, the KN memristor could be used as an artificial synapse in neuromorphic computing systems.

Original languageEnglish
Pages (from-to)25673-25682
Number of pages10
JournalACS Applied Materials and Interfaces
Issue number30
Publication statusPublished - 2018 Aug 1


  • amorphous KNbO films
  • artificial synapse
  • memristor
  • neuromorphic computing
  • synaptic metaplasticity

ASJC Scopus subject areas

  • Materials Science(all)


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