Excitatory post-synaptic current and synaptic plasticity of semiconducting polymer/electrolyte system

There are two important resemblances between bio-synapse and semiconducting polymer/electrolyte hetero-junction. The first is that ionic migration at the interface would modulate the ionic movement. The second is in the structure that the ionic channel form in hetero-junction to conduct ion migration. These two aspects suggested the latter could be used in simulating synaptic plasticity. Therefore, we adopted conventional measurement method used in neuroscience studying synaptic plasticity. We have successfully mimicked frequency selectivity using Pt/P3HT/PEO+Li+/Pt cell, which responded in depression at LFS and in potentiation at HFS. The ionic dynamic was controlled by the ionic type and the interface. Moreover, we have found that long term memory (plasticity) existed in Cs and K doped PEO, which might be used as band-pass filtering.