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

Switching Response in Organic Electrochemical Transistors by Ionic Diffusion and Electronic Transport DOI Creative Commons
Juan Bisquert, B.R. Ilyassov, Nir Tessler

et al.

Advanced Science, Journal Year: 2024, Volume and Issue: unknown

Published: July 25, 2024

The switching response in organic electrochemical transistors (OECT) is a basic effect which transient current occurs to voltage perturbation. This phenomenon has an important impact on different aspects of the application OECT, such as equilibration times, hysteresis dependence scan rates, and synaptic properties for neuromorphic applications. Here we establish model that unites vertical ion diffusion horizontal electronic transport analysis time-dependent OECTs. We use combination tools consisting physical analytical model; advanced 2D drift-diffusion simulation; experimental measurement poly(3-hexylthiophene) (P3HT) OECT. show reduction general simple equations average ionic/hole concentration inside film, produces Bernards-Malliaras conservation equation coupled with equation. provide classification pulse, correspondent effects transfer curves. shape transients basically related main control phenomenon, either ions during doping dedoping, or along channel length.

Language: Английский

Citations

6
Cyclic Voltammetry and Spectroelectrochemistry of Two Common Thiophene Polymers Reveals Ion Diffusion and Polaron Wave Function Extent DOI

A. W. Bevan,

Carol-Lynn Gee, Melissa L. Vermette

et al.

Chemistry of Materials, Journal Year: 2025, Volume and Issue: unknown

Published: March 3, 2025

Language: Английский

Citations

0
Dissipative charge transport in organic mixed ionic-electronic conductor channels DOI Creative Commons
Filippo Bonafè,

Mattia Bazzani,

Beatrice Fraboni

et al.

Nature Communications, Journal Year: 2025, Volume and Issue: 16(1)

Published: March 13, 2025

Understanding charge transport in organic mixed ionic-electronic conductors (OMIECs) is crucial to improve the performances of bioelectronic and neuromorphic devices. Recent studies reveal that amplification electrical signals electrochemical transistors determined by volumetric capacitance cv electronic mobility μe OMIEC channels, but how material parameters impact on signal propagation speed energy dissipation remains unclear. To address this issue, we combine measurements phase velocity microstructured channels with local ionic displacements modulated atomic force microscopy. We interpret experimental data a simplified transmission line model determine dispersion relation for channels. demonstrate at relevant frequencies dominated ratio μel/cv, constituting an additional figure merit benchmark formulations. These results highlight intrinsic limitations OMIEC-based circuits compare their efficiency neuronal transmission. The authors examine conductor Results

Language: Английский

Citations

0
Using the Transversal Admittance to Understand Organic Electrochemical Transistors DOI Creative Commons
Juan Bisquert, Scott T. Keene

Advanced Science, Journal Year: 2024, Volume and Issue: unknown

Published: Nov. 25, 2024

The transient behavior of organic electrochemical transistors (OECTs) is complex due to mixed ionic-electronic properties that play a central role in bioelectronics and neuromorphic applications. Some works applied impedance spectroscopy OECTs for understanding transport the frequency-dependent response devices. transversal admittance (drain current vs gate voltage) used sensing However, general theory admittance, until now, has been incomplete. derive model combines electronic motion along channel vertical ion diffusion by insertion from electrolyte, depending on several features as chemical capacitance, coefficient ions, mobility. Based charge conservation equations, it shown produces standard result intercalation systems, while contains parameters hole accumulation channel. spectral shapes drain currents spectra are established reference equivalent circuit models impedances, describe well measurements PEDOT:PSS OECT. New insights provided determination mobility ratio between currents.

Language: Английский

Citations

3
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