Tunable Synaptic Plasticity in Crystallized Conjugated Polymer Nanowire Artificial Synapses

Han, Hong; Xu, Zhipeng; Guo, Kun; Ni, Youxuan; Ma, Mingxue; Yu, Haiyang; Wei, Huanhuan; Gong, Jue; Zhang, Shuo; Xu, Wentao

doi:10.1002/aisy.201900176

Cited by 44 publications

(34 citation statements)

References 36 publications

(47 reference statements)

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“…We also performed atomic force microscopy (AFM) analysis to investigate morphological changes in P3HT films depending on the type of doping. [55] As shown in Figure 5b and Figure S17, Supporting Information, the surface morphologies of the P3HT films were found to dramatically change with the Brønsted acid doping by BCF, while the changes were less significant with the Lewis acid doping and F4TCNQ doping. The Brønsted acid-doped P3HT films showed drastically increased root-mean-square roughness (R q ) values from 0.681 nm to 6.534 nm with increasing BCF ratio from 0% (i.e., neat P3HT) to 120%.…”

Section: Crystallographic and Morphological Analyses Of Bcf-doped P3hmentioning

confidence: 94%

Brønsted Acid Doping of P3HT with Largely Soluble Tris(pentafluorophenyl)borane for Highly Conductive and Stable Organic Thermoelectrics Via One‐Step Solution Mixing

Suh

Jung

et al. 2020

Advanced Energy Materials

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Molecular doping is essential for improving the thermoelectric properties of conjugated polymers, but dopants of low solubility either restrict the formation of high quality films or complicate fabrication steps. Although a highly soluble molecular dopant, tris(pentafluorophenyl)borane (BCF), has been sporadically studied, its potential has not yet been fully explored. Herein, particularly intriguing effects of Brønsted acid doping with BCF‐water complexes for poly(3‐hexylthiophene) (P3HT) are reported, which can facilitate substantial increases in electrical and thermoelectric properties with remarkable doping stabilities. Interestingly, a unique polymorph of P3HT with interdigitated alkyl chains (called type II) is observed in the Brønsted acid doping with BCF‐water complexes. Moreover, the doped P3HT shows conformational change to the quinoid structure, enabling increased backbone planarity. As a result, the Brønsted acid‐doped P3HT films exhibit outstanding electrical conductivities, thermoelectric power factors, and figure‐of‐merit of up to 33.0 S cm−1, 28.3 µW m−1 K−2, and 0.034, respectively. These values are at least an order of magnitude higher than those of P3HT films doped with a conventional molecular dopant, 7,7,8,8‐tetracyano‐2,3,5,6‐tetrafluoroquinodimethane. The Brønsted acid doping with BCF‐water complexes also affords excellent air stabilities of P3HT films, which potentially provides a strong comparative advantage over existing highly reactive salt‐type dopants, such as FeCl3.

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Section: Crystallographic and Morphological Analyses Of Bcf-doped P3hmentioning

confidence: 94%

Brønsted Acid Doping of P3HT with Largely Soluble Tris(pentafluorophenyl)borane for Highly Conductive and Stable Organic Thermoelectrics Via One‐Step Solution Mixing

Suh

Jung

et al. 2020

Advanced Energy Materials

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“…As a better choice, two terminal devices (such as memristors), with less footprint and lower power consumption, are widely utilized to mimic synapses. [63,[71][72][73][74][75] The strength of synaptic connection, known as synaptic weight, depends on the concentration of ions. Synaptic plasticity represents the changes of synaptic weight, which can be influenced by the spiking rate, interval of pre-and postsynaptic spiking and other factors.…”

Section: Volatile Memristor As Artificial Synapsementioning

confidence: 99%

Recent Advances of Volatile Memristors: Devices, Mechanisms, and Applications

Wang

Yang

Mao

et al. 2020

Advanced Intelligent Systems

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Due to the rapid development of artificial intelligence (AI) and internet of things (IoTs), neuromorphic computing and hardware security are becoming more and more important. The volatile memristors, which feature spontaneous decay of device conductance, own the distinct combination of high similarity to the biological neurons and synapses and unique physical mechanisms. They are excellent candidates for mimicking the synaptic functions and ideal randomness source of the entropy for hardware‐based security. Herein, the recent advances of volatile memristors in devices, mechanisms, and application aspects are summarized. First, a brief introduction is presented to describe the switching type, materials, and temporal response of volatile memristors. Second, the volatile switching mechanisms are discussed and grouped into ion effects, thermal effects, and electrical effects. Third, attention is focused on the applications of volatile memristors for access devices, neuromorphic computing (artificial neurons and synapses), and hardware security (true random number generators and physical unclonable functions). Finally, major challenges and future outlook of volatile memristors for neuromorphic computing and hardware security are discussed.

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“…Conjugated polymers with controllable crystallinity may also contribute to the modulation of STP and LTP. [127]…”

Section: Criteriamentioning

confidence: 99%

Evolution of Bio‐Inspired Artificial Synapses: Materials, Structures, and Mechanisms

Wei

Gong

et al. 2020

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Artificial synapses (ASs) are electronic devices emulating important functions of biological synapses, which are essential building blocks of artificial neuromorphic networks for brain‐inspired computing. A human brain consists of several quadrillion synapses for information storage and processing, and massively parallel computation. Neuromorphic systems require ASs to mimic biological synaptic functions, such as paired‐pulse facilitation, short‐term potentiation, long‐term potentiation, spatiotemporally‐correlated signal processing, and spike‐timing‐dependent plasticity, etc. Feature size and energy consumption of ASs need to be minimized for high‐density energy‐efficient integration. This work reviews recent progress on ASs. First, synaptic plasticity and functional emulation are introduced, and then synaptic electronic devices for neuromorphic computing systems are discussed. Recent advances in flexible artificial synapses for artificial sensory nerves are also briefly introduced. Finally, challenges and opportunities in the field are discussed.

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Tunable Synaptic Plasticity in Crystallized Conjugated Polymer Nanowire Artificial Synapses

Cited by 44 publications

References 36 publications

Brønsted Acid Doping of P3HT with Largely Soluble Tris(pentafluorophenyl)borane for Highly Conductive and Stable Organic Thermoelectrics Via One‐Step Solution Mixing

Brønsted Acid Doping of P3HT with Largely Soluble Tris(pentafluorophenyl)borane for Highly Conductive and Stable Organic Thermoelectrics Via One‐Step Solution Mixing

Recent Advances of Volatile Memristors: Devices, Mechanisms, and Applications

Evolution of Bio‐Inspired Artificial Synapses: Materials, Structures, and Mechanisms

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