Transient Current Responses of Organic Electrochemical Transistors: Evaluating Ion Diffusion, Chemical Capacitance, and Series Elements DOI Creative Commons
Juan Bisquert, Nir Tessler

Advanced Functional Materials, Journal Year: 2024, Volume and Issue: unknown

Published: Dec. 17, 2024

Abstract For the successful implementation of organic electrochemical transistors in neuromorphic computing, bioelectronics, and real‐time sensing applications it is essential to understand factors that influence device switching times. This work describes a physical‐electrochemical model transient response step gate voltage. The incorporates 1) ion diffusion inside channel governs electronic conductivity, 2) horizontal electron transport, 3) external elements (capacitance, ionic resistance) dynamics electrolyte. finds general expression two different time constants determine vertical insertion process terms transport/polarization parameters, addition transit time. highlights central role chemical capacitance determining modulation lateral conductivity. types drain current are classified, significance for synaptic operation circuits discussed. confirmed by detailed simulations enable visualize ions distributions dynamics.

Language: Английский

Thermal Processing Creates Water‐Stable PEDOT:PSS Films for Bioelectronics DOI Creative Commons
Siddharth Doshi,

Margaux O. A. Forner,

Pingyu Wang

et al.

Advanced Materials, Journal Year: 2025, Volume and Issue: unknown

Published: March 3, 2025

Abstract Organic mixed ionic‐electronic conductors have emerged as a key material for the development of bioelectronic devices due to their soft mechanical properties, biocompatibility, and high volumetric capacitance. In particular, PEDOT:PSS has become choice because it is highly conductive, easily processible, commercially available. However, dispersible in water, leading delamination films when exposed biological environments. For this reason, chemical cross–linking agents such (3‐glycidyloxypropyl)trimethoxysilane (GOPS) are used stabilize but at cost decreased electrical performance. Here, shown that thin water‐stable by simply baking temperatures (>150 °C) short time (≈ 2 min). It heat‐treated stable chemically‐cross–linked counterparts, with performance maintained >20 days both vitro vivo. The eliminate electrically insulating cross–linkers, resulting 3× increase Applying thermal energy using focused femtosecond laser enables direct patterning 3D microstructures. treatment method compatible wide range substrates readily substituted into existing workflows manufacturing devices, enabling its rapid adoption field bioelectronics.

Language: Английский

Citations

0
A testable weighting factor for accurate analysis of the organic electrochemical transistors' transient response behavior DOI Creative Commons

Xiaorong Niu,

Zhaoqun Wang, Mu‐Chun Wang

et al.

Journal of Applied Physics, Journal Year: 2025, Volume and Issue: 137(11)

Published: March 17, 2025

Organic electrochemical transistors (OECTs) have shown significant potential in applications ranging from bio-sensing to neuromorphic devices and cell impedance monitors. Transient response plays a pivotal role varied applications. However, it is still challenging accurately analyze the complex equilibrium process of transient response. The factor f constant proportionality about amplitude ratio source current gate current. It an important analysis Herein, we establish test method for measuring Our model fits almost perfectly with drain following voltage step when directly obtained amplitudes divided by at high-frequency spectra OECT. We further deduced empirical expressions as function settings, channel's geometric parameters, concentration solution. This work understanding mechanisms OECT's behavior.

Language: Английский

Citations

0
Transient Current Responses of Organic Electrochemical Transistors: Evaluating Ion Diffusion, Chemical Capacitance, and Series Elements DOI Creative Commons
Juan Bisquert, Nir Tessler

Advanced Functional Materials, Journal Year: 2024, Volume and Issue: unknown

Published: Dec. 17, 2024

Abstract For the successful implementation of organic electrochemical transistors in neuromorphic computing, bioelectronics, and real‐time sensing applications it is essential to understand factors that influence device switching times. This work describes a physical‐electrochemical model transient response step gate voltage. The incorporates 1) ion diffusion inside channel governs electronic conductivity, 2) horizontal electron transport, 3) external elements (capacitance, ionic resistance) dynamics electrolyte. finds general expression two different time constants determine vertical insertion process terms transport/polarization parameters, addition transit time. highlights central role chemical capacitance determining modulation lateral conductivity. types drain current are classified, significance for synaptic operation circuits discussed. confirmed by detailed simulations enable visualize ions distributions dynamics.

Language: Английский

Citations

0