Stretchable and Stable Electrolyte‐Gated Organic Electrochemical Transistor Synapse with a Nafion Membrane for Enhanced Synaptic Properties
Trong Danh Nguyen, Tran Quang Trung, Yurim Lee, Nae‐Eung Lee
Abstract
Stretchable artificial synaptic devices are promising for integration into soft neuromorphic systems. However, the organic electrochemical transistor (OECT)‐based synaptic device is challenging due to the difficulty of obtaining high mechanical deformability and durability as well as high long‐term plasticity (LTP) and retention time. Herein, a highly stable and stretchable synaptic OECT fabricated on a 3D mogul‐patterned substrate with stress absorption capability with improved synaptic properties is reported. The mechanical stability of a poly(3,4‐ethylenedioxythiophene)polystyrene sulfonate (PEDOT:PSS) channel and, in turn, the OECT is improved by adding additives in the channel. Synaptic properties including synaptic weight (SW), LTP, and retention time could be tuned and improved by adopting a Nafion membrane between the channel and the gate electrode, which modifies the transport dynamics of ions in the electrolyte across the membrane. This approach paves a way for improving and tuning the synaptic properties of stretchable biomimetic OECT synapses.