Ultrasensitive artificial synapse based on conjugated polyelectrolyte

Wentao Xu, Thanh Luan Nguyen, Young Tae Kim, Christoph Wolf, Raphael Pfattner, Jeffrey Lopez, Byeong Gyu Chae, Sung Il Kim, Moo Yeol Lee, Eul Yong Shin, Yong Young Noh, Joon Hak Oh, Hyunsang Hwang, Chan Gyung Park, Han Young Woo, Tae Woo Lee*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

74 Scopus citations


Emulating essential synaptic working principles using a single electronic device has been an important research field in recent years. However, achieving sensitivity and energy consumption comparable to biological synapses in these electronic devices is still a difficult challenge. Here, we report the fabrication of conjugated polyelectrolyte (CPE)-based artificial synapse, which emulates important synaptic functions such as paired-pulse facilitation (PPF), spike-timing dependent plasticity (STDP) and spiking rate dependent plasticity (SRDP). The device exhibits superior sensitivity to external stimuli andlow-energy consumption. Ultrahigh sensitivity and low-energy consumption are key requirements for building up brain-inspired artificial systems and efficient electronic-biological interface. The excellent synaptic performance originated from (i) a hybrid working mechanism that ensured the realization of both short-term and long-term plasticity in the same device, and (ii) the mobile-ion rich CPE thin film that mediate migration of abundant ions analogous to a synaptic cleft. Development of this type of artificial synapse is both scientifically and technologically important for construction of ultrasensitive highly-energy efficient and soft neuromorphic electronics.

Original languageEnglish (US)
Pages (from-to)575-581
Number of pages7
JournalNano Energy
StatePublished - Jun 2018


  • Dipole reorientation
  • Ion migration
  • Memory
  • Neuromorphic devices
  • Sensitivity

ASJC Scopus subject areas

  • Renewable Energy, Sustainability and the Environment
  • Materials Science(all)
  • Electrical and Electronic Engineering


Dive into the research topics of 'Ultrasensitive artificial synapse based on conjugated polyelectrolyte'. Together they form a unique fingerprint.

Cite this