期刊
NATURE COMMUNICATIONS
卷 12, 期 1, 页码 -出版社
NATURE RESEARCH
DOI: 10.1038/s41467-021-22680-5
关键词
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资金
- General Research Fund (GRF) [HKU 17264016, HKU 17204517]
- National Natural Science Foundation of China (NSFC)
- Research Grants Council (RGC) of Hong Kong Joint Research Scheme [HKU 715/14]
- National Science Foundation [NSF DMR-1751308]
- DOE Office of Science by Argonne National Laboratory [DE-AC02-06CH11357]
- SHyNE Resource (NSF) [ECCS-1542205]
- IIN
- Northwestern's MRSEC program (NSF) [DMR-1720139]
In this study, a novel organic electrochemical transistor was used to create associative learning circuits, showcasing features such as low write bias, long retention time, and the ability to associate two physical inputs (light and pressure). The characterization of the non-volatile material using various techniques deepened the understanding of its properties, representing a critical advancement for organic electrochemical devices in neuromorphic applications.
Associative learning, a critical learning principle to improve an individual's adaptability, has been emulated by few organic electrochemical devices. However, complicated bias schemes, high write voltages, as well as process irreversibility hinder the further development of associative learning circuits. Here, by adopting a poly(3,4-ethylenedioxythiophene):tosylate/Polytetrahydrofuran composite as the active channel, we present a non-volatile organic electrochemical transistor that shows a write bias less than 0.8V and retention time longer than 200min without decoupling the write and read operations. By incorporating a pressure sensor and a photoresistor, a neuromorphic circuit is demonstrated with the ability to associate two physical inputs (light and pressure) instead of normally demonstrated electrical inputs in other associative learning circuits. To unravel the non-volatility of this material, ultraviolet-visible-near-infrared spectroscopy, X-ray photoelectron spectroscopy and grazing-incidence wide-angle X-ray scattering are used to characterize the oxidation level variation, compositional change, and the structural modulation of the poly(3,4-ethylenedioxythiophene):tosylate/Polytetrahydrofuran films in various conductance states. The implementation of the associative learning circuit as well as the understanding of the non-volatile material represent critical advances for organic electrochemical devices in neuromorphic applications. Organic transistors that can simulate basic synaptic functions and act as biomimetic devices are advantageous for next generation bioelectronics. Here, the authors realize non-volatile organic electrochemical transistors with optimized performance required for associative learning circuits.
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