Hunan Key Laboratory for Super Microstructure and Ultrafast Process, School of Physics and Electronics, Central South University , Changsha, Hunan 410083, P. R. China.
Department of Physics and Astronomy, University of Rochester , Rochester, New York 14627, United States.
ACS Appl Mater Interfaces. 2016 Oct 5;8(39):26169-26175. doi: 10.1021/acsami.6b08866. Epub 2016 Sep 21.
Realization of biological synapses using electronic devices is regarded as the basic building blocks for neuromorphic engineering and artificial neural network. With the advantages of biocompatibility, low cost, flexibility, and compatible with printing and roll-to-roll processes, the artificial synapse based on organic transistor is of great interest. In this paper, the artificial synapse simulation by ion-gel gated organic field-effect transistors (FETs) with poly(3-hexylthiophene) (P3HT) active channel is demonstrated. Key features of the synaptic behaviors, such as paired-pulse facilitation (PPF), short-term plasticity (STP), self-tuning, the spike logic operation, spatiotemporal dentritic integration, and modulation are successfully mimicked. Furthermore, the interface doping processes of electrolyte ions between the active P3HT layer and ion gels is comprehensively studied for confirming the operating processes underlying the conductivity and excitatory postsynaptic current (EPSC) variations in the organic synaptic devices. This study represents an important step toward building future artificial neuromorphic systems with newly emerged ion gel gated organic synaptic devices.
利用电子设备实现生物突触被认为是神经形态工程和人工神经网络的基本构建块。基于聚（3-己基噻吩）（P3HT）有源通道的离子凝胶门有机场效应晶体管（FET）的人工突触具有生物相容性、低成本、灵活性以及与打印和卷对卷工艺兼容的优势，因此备受关注。本文通过离子凝胶门有机场效应晶体管（FET）模拟了人工突触，该晶体管的有源通道为聚（3-己基噻吩）（P3HT）。成功模拟了突触行为的关键特征，如成对脉冲易化（PPF）、短期可塑性（STP）、自调节、尖峰逻辑运算、时空树突整合和调制。此外，还综合研究了电解质离子在有源 P3HT 层和离子凝胶之间的界面掺杂过程，以确认有机突触器件中电导率和兴奋性突触后电流（EPSC）变化的工作过程。这项研究是朝着利用新兴的离子凝胶门有机突触器件构建未来人工神经形态系统迈出的重要一步。
