Side chain engineering enhances the high-temperature resilience and ambient stability of organic synaptic transistors for neuromorphic applications

An n-type conjugated polymer based on diazaisoindigo (AIID) and fluorinated thiophene units is introduced. Combining the strong electron-accepting properties of AIID with backbone fluorination produced gAIID-2FT, leading to organic electrochemical transistors (OECTs) with normalized values of 4.09 F cm −1 V −1 s −1 and a normalized transconductance (g m,norm ) of 0.94 S cm −1 . The resulting OECTs exhibit exceptional operational stability and long shelf-life in ambient conditions, preserving 100% of the original maximum drain current after over 3 h of continuous operation and 28 days of storage in the air. Our work highlights the advantages of integrating strong electron acceptors with donor fluorination to boost the performance and stability of n-type OECTs.

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“…Number-average ( M n ) and weight-average ( M w ) molecular weights were performed following the previously published procedure …”

Section: Methodsmentioning

confidence: 99%

“…Number-average (M n ) and weight-average (M w ) molecular weights were performed following the previously published procedure. 39 UV−Vis−NIR Absorption Spectroscopy. UV−Vis−NIR absorption spectra were obtained according to the published procedure.…”

Section: Chemistry Of Materialsmentioning

confidence: 99%

n-Type Organic Electrochemical Transistors with High Transconductance and Stability

et al. 2023

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“…Up to now, much attention has been paid to the development of high-temperature-resilient/stable iontronic neural devices through utilizing temperature-stable materials. [117,164,[265][266][267] For example, a robust 2D materials-based iontronic memristor (graphene/MoS2-xOx/graphene) have demonstrated reliable resistance switching at temperature up to 340 °C; [164] (semi)conductive polymer combined with a thermal stable iongel electrolyte enables solid-state iontronic neural transistors to operate stably at a temperature above 90 °C. [259,267] However, the low-temperature device stability, humidity stability, long-term storage stability, and operation (cyclic) stability of iontronic neural devices, especially iontronic neuromorphic sensing devices, have been largely ignored.…”

Section: Conclusion and Prospectsmentioning

confidence: 99%

“…[117,164,[265][266][267] For example, a robust 2D materials-based iontronic memristor (graphene/MoS2-xOx/graphene) have demonstrated reliable resistance switching at temperature up to 340 °C; [164] (semi)conductive polymer combined with a thermal stable iongel electrolyte enables solid-state iontronic neural transistors to operate stably at a temperature above 90 °C. [259,267] However, the low-temperature device stability, humidity stability, long-term storage stability, and operation (cyclic) stability of iontronic neural devices, especially iontronic neuromorphic sensing devices, have been largely ignored. Future studies should pay more attention to device stability issues; 6) Gain a deeper understanding of the biological nervous system, which can be achieved through collaboration with neuroscientists; 7) Based on the above research, further expand the functions of NSC devices according to the requirements of practical application scenarios.…”

Section: Conclusion and Prospectsmentioning

confidence: 99%

Emerging Iontronic Neural Devices for Neuromorphic Sensory Computing

Dai

Liu

et al. 2023

Advanced Materials

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Living organisms have a very mysterious and powerful sensory computing system based on ion activity. Interestingly, studies on iontronic devices in the past few years have proposed a promising platform for simulating the sensing and computing functions of living organisms, because: 1) iontronic devices can generate, store, and transmit a variety of signals by adjusting the concentration and spatiotemporal distribution of ions, which analogs to how the brain performs intelligent functions by alternating ion flux and polarization; 2) through ionic‐electronic coupling, iontronic devices can bridge the biosystem with electronics and offer profound implications for soft electronics; 3) with the diversity of ions, iontronic devices can be designed to recognize specific ions or molecules by customizing the charge selectivity, and the ionic conductivity and capacitance can be adjusted to respond to external stimuli for a variety of sensing schemes, which can be more difficult for electron‐based devices. This review provides a comprehensive overview of emerging neuromorphic sensory computing by iontronic devices, highlighting representative concepts of both low‐level and high‐level sensory computing and introducing important material and device breakthroughs. Moreover, iontronic devices as a means of neuromorphic sensing and computing are discussed regarding the pending challenges and future directions.

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“…This fantastic ion-to-current transducing feature appears particularly attractive for chemical and biological sensors, and neuromorphic engineering. [17][18][19][20][21][22][23] In addition, the OECT based on solid or gel electrolytes is also highly sought after as it broadens its application scope and shows promise as flexible and wearable electronics. [24][25][26][27][28] In order to realize a high-transconductance OECT, the organic semiconductor channel layer is supposed to have a combination of high charge carrier mobility, preferably with a densely packed crystalline film morphology, and high charge storage capacity that largely depends on facile ion diffusion into the channel.…”

Section: Introductionmentioning

confidence: 99%

n‐Type Glycolated Imide‐Fused Polycyclic Aromatic Hydrocarbons with High Capacity for Liquid/Solid‐Electrolyte‐based Electrochemical Devices

Zhu

Lan

et al. 2023

Adv Funct Materials

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Currently, n-type small-molecule mixed ionic-electronic conductors remain less explored and their molecular design rules are not mature enough. Herein, two n-type glycolated imide-fused polycyclic aromatic hydrocarbons (IPAHs), d-gdiPDI and t-gdiPDI, are developed to probe the effects of molecular conformation on the electronic, electrochemical, morphological, and coupled ionic-electronic transport properties. It is found that the highly twisted scaffold in d-gdiPDI, compared to the nearly planar one of t-gdiPDI, has a strong positive effect on the charge storage properties and thus the performance of organic electrochemical transistors (OECTs). d-gdiPDI exhibits a volumetric capacitance of 657 F cm −3 , obviously outperforming that of t-gdiPDI (261 F cm −3 ), which is the highest value reported to date for smallmolecule OECT materials. Moreover, a high charge-storage capacity of up to 479 F g −1 is observed for d-gdiPDI. Arising from such high ionic-electronic coupling characteristic, d-gdiPDI-based OECTs present a ≈2 × times higher geometry-normalized transconductance (g m,norm ) of 105.3 mS cm −1 relative to that of t-gdiPDI counterparts. Significantly, further application of d-gdiPDI in solid-electrolyte OECTs delivers a g m,norm of 142.4 mS cm −1 . These findings indicate that IPAHs are very promising candidates for n-type small-molecule OECTs and highlight the superiority of twisting conformation manipulation in materials design toward high-performance electrochemical devices.

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Side chain engineering enhances the high-temperature resilience and ambient stability of organic synaptic transistors for neuromorphic applications

Cited by 20 publications

References 55 publications

n-Type Organic Electrochemical Transistors with High Transconductance and Stability

n-Type Organic Electrochemical Transistors with High Transconductance and Stability

Emerging Iontronic Neural Devices for Neuromorphic Sensory Computing

n‐Type Glycolated Imide‐Fused Polycyclic Aromatic Hydrocarbons with High Capacity for Liquid/Solid‐Electrolyte‐based Electrochemical Devices

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