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10 Jan 2025 • Journal Article • Nature Electronics
Improved organic electrochemical transistor stability using solvent degassing and chemical doping
AbstractOrganic mixed ionic–electronic conductors (OMIECs), which can be used to build organic electrochemical transistors (OECTs), are of potential use in flexible, large-area and bioelectronic systems. Although hole-transporting p-type OMIECs are susceptible to oxidation, and oxygen leads to OECT instability, it is unclear whether oxygen also behaves as an uncontrolled p-dopant
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17 Dec 2024 • Journal Article • Advanced Functional Materials
Transient Current Responses of Organic Electrochemical Transistors: Evaluating Ion Diffusion, Chemical Capacitance, and Series Elements
AbstractFor the successful implementation of organic electrochemical transistors in neuromorphic computing, bioelectronics, and real-time sensing applications it is essential to understand the factors that influence device switching times. This work describes a physical-electrochemical model of the transient response to a step of the gate voltage. The model incorporates 1) ion
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4 Dec 2024 • Journal Article • Advanced Electronic Materials
Magneto-Capacitance of PEDOT:PSS Thin Films; Effects of a Two-Phase System and Coulomb Interaction
AbstractThe study of the net magneto-capacitance, C(B), in thin films of the conducting polymer Poly(3 4-ethylenedioxythiophene):poly(styrene sulfonate) (PEDOT:PSS) is presented. In the films there are charged electrically-conducting PEDOT-rich regions surrounded by PSS insulating charged material. The high-conductivity grade PEDOT:PSS thin films are studied at low temperature
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28 Sep 2024 • Journal Article • Journal of Applied Physics
Experimentally verified organic electrochemical transistor model
AbstractThe Bernards–Malliaras model, published in 2007, is the primary reference for the operation of organic electrochemical transistors (OECTs). It assumes that, as in most transistors, the electronic transport is drift only. However, in other electrochemical devices, such as batteries, the charge neutrality is accompanied by diffusion-only transport. Using detailed 2D device
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25 Jul 2024 • Journal Article • Advanced Science
Switching Response in Organic Electrochemical Transistors by Ionic Diffusion and Electronic Transport
AbstractThe switching response in organic electrochemical transistors (OECT) is a basic effect in which a transient current occurs in response to a voltage perturbation. This phenomenon has an important impact on different aspects of the application of OECT, such as the equilibration times, the hysteresis dependence on scan rates, and the synaptic properties for neuromorphic
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1 Jun 2024 • Journal Article • Advanced Electronic Materials
Unveiling the Impact of the Electrolyte's Counter Ions on Organic Electrochemical Transistor Performance
AbstractThe effect of the electrolyte's counter-ion in organic electrochemical transistors is often neglected. the influence of anions (i.e., counter ions) is investigated on organic electrochemical transistors (OECTs) with a PEDOT:PSS-like semiconductor through device simulations. The study examined the effects of mobile anions on OECT performance under two scenarios: when
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14 Mar 2024 • Journal Article • Advanced Materials
Electrical Doping of Metal Halide Perovskites by Co-evaporation and Application in PN Junctions
AbstractElectrical doping of semiconductors is a revolutionary development that enabled many electronic and optoelectronic technologies. While doping of many inorganic and organic semiconductors has been well-established, controlled electrical doping of metal halide perovskites is yet to be demonstrated. In this work, we achieve efficient n- and p-type electrical doping of
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29 Feb 2024 • Journal Article • Scientific Reports
Strategy to improve synaptic behavior of ion-actuated synaptic transistors—the use of ion blocking layer to improve state retention
AbstractSynaptic transistors (STs) with a gate/electrolyte/channel stack, where mobile ions are electrically driven across the solid electrolyte, have been considered as analog weight elements for neuromorphic computing. The current (ID) between the source and drain in the ST is analogously updated by gate voltage (VG) pulses, enabling high pattern recognition accuracy in
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14 Feb 2024 • Journal Article • Journal of Applied Physics
Device simulations of perovskite transistors containing mobile ions and their relevance to experimental data
AbstractWe present a device simulation of lead-halide perovskite-based thin film transistors (TFTs) containing mobile charged species to provide physical reasoning for the various experimental reports. We study the output characteristics for a range of scan duration (1/speed), average mobile ion densities, and N- and P-channel TFTs. We then directly compare our results to
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20 Nov 2023 • Journal Article • Applied Physics Letters
Direct correlation between the built-in potential and the power conversion efficiency of NFA organic solar cells
AbstractWhile it is known that too low built-in potential is detrimental to cells' performance, there is no consensus regarding the importance of maximizing the internal electric field or the built-in potential for achieving the highest power conversion efficiency of non-fullerene acceptor (NFA) organic solar cells. We use one of the prototypical NFA bulk heterojunction solar
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