Kim, Soo Jin Jeong, Jae-Seung Jang, Ho Won Yi, Hyunjung Yang, Hoichang Ju, Hyunsu Lim, Jung Ah 2024-01-19T14:30:22Z 2024-01-19T14:30:22Z 2021-10-21 2021-07 0935-9648 https://pubs.kist.re.kr/handle/201004/116786 Dendritic network implementable organic neurofiber transistors with enhanced memory cyclic endurance for spatiotemporal iterative learning are proposed. The architecture of the fibrous organic electrochemical transistors consisting of a double-stranded assembly of electrode microfibers and an iongel gate insulator enables the highly sensitive multiple implementation of synaptic junctions via simple physical contact of gate-electrode microfibers, similar to the dendritic connections of a biological neuron fiber. In particular, carboxylic-acid-functionalized polythiophene as a semiconductor channel material provides stable gate-field-dependent multilevel memory characteristics with long-term stability and cyclic endurance, unlike the conventional poly(alkylthiophene)-based neuromorphic electrochemical transistors, which exhibit short retention and unstable endurance. The dissociation of the carboxylic acid of the polythiophene enables reversible doping and dedoping of the polythiophene channel by effectively stabilizing the ions that penetrate the channel during potentiation and depression cycles, leading to the reliable cyclic endurance of the device. The synaptic weight of the neurofiber transistors with a dendritic network maintains the state levels stably and is independently updated with each synapse connected with the presynaptic neuron to a specific state level. Finally, the neurofiber transistor demonstrates successful speech recognition based on iterative spiking neural network learning in the time domain, showing a substantial recognition accuracy of 88.9%. English WILEY-V C H VERLAG GMBH POLYTHIOPHENE DEVICE Dendritic Network Implementable Organic Neurofiber Transistors with Enhanced Memory Cyclic Endurance for Spatiotemporal Iterative Learning Article 10.1002/adma.202100475 1 ADVANCED MATERIALS, v.33, no.26 ADVANCED MATERIALS 33 26 scie scopus 000653219000001 2-s2.0-85106330833 Chemistry, Multidisciplinary Chemistry, Physical Nanoscience & Nanotechnology Materials Science, Multidisciplinary Physics, Applied Physics, Condensed Matter Chemistry Science & Technology - Other Topics Materials Science Physics Article POLYTHIOPHENE DEVICE artificial neural networks cyclic endurance fiber&#8208 shaped electronic devices neuromorphic devices organic electrochemical transistors polythiophene redox mechanism