Scaling Organic Electrochemical Transistors Down to Nanosized Channels

D’Angelo, Pasquale; Verna, Alessio; Ballesio, Alberto; Parmeggiani, Matteo; Sanginario, Alessandro; Tarabella, Giuseppe; Demarchi, Danilo; Pirri, Candido Fabrizio; Cocuzza, Matteo; Iannotta, Salvatore

doi:10.1002/smll.201902332

Cited by 26 publications

(25 citation statements)

References 64 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This is an interesting result, as much of the work to improve OMIEC device time response has focused on improving ion transport [ 37 ] and reducing device dimensions. [ 38,39 ] This work shows that even in such optimized settings bipolaron population kinetics likely present a limit to device speed. This begs the question, can OMIECs be designed to tailor electronic charge carrier population kinetics?…”

Section: Figurementioning

confidence: 96%

Time‐Resolved Structural Kinetics of an Organic Mixed Ionic–Electronic Conductor

Paulsen

Takacs

et al. 2020

Advanced Materials

View full text Add to dashboard Cite

The structure and packing of organic mixed ionic-electronic conductors have an especially significant effect on transport properties. In operating devices, this structure is not fixed but is responsive to changes in electrochemical potential, ion intercalation, and solvent swelling. Toward this end, the steadystate and transient structure of the model organic mixed conductor, poly(3,4ethylenedioxythiophene) polystyrene sulfonate (PEDOT:PSS), is characterized using multimodal time-resolved operando techniques. Steady-state operando X-ray scattering reveals a doping-induced lamellar expansion of 1.6 Å followed by 0.4 Å relaxation at high doping levels. Time-resolved operando X-ray scattering reveals asymmetric rates of lamellar structural change during doping and dedoping that do not directly depend on potential or charging transients. Timeresolved spectroscopy establishes a link between structural transients and the complex kinetics of electronic charge carrier subpopulations, in particular the polaron-bipolaron equilibrium. These findings provide insight into the factors limiting the response time of organic mixed-conductor-based devices, and present the first real-time observation of the structural changes during doping and dedoping of a conjugated polymer system via X-ray scattering. Organic mixed ionic-electronic conductors (OMIECs) are a class of conjugated materials [1] of growing interest for bioelectronic, [2] energy storage, [3] electrochromic, [4] and neuromorphic computing [5] applications due to their ability to simultaneously transport both ionic and electronic charge, and couple between

show abstract

Section: Figurementioning

confidence: 96%

Time‐Resolved Structural Kinetics of an Organic Mixed Ionic–Electronic Conductor

Paulsen

Takacs

et al. 2020

Advanced Materials

View full text Add to dashboard Cite

show abstract

“…In this regard, a thorough study has been recently carried out on OECTs with submicrometric channel sizes fabricated on electrode gaps by electromigration-induced break junction technique. Here, the authors report superior amplifying properties of fast varying signals and time responses in the millisecond scale [36]. However, it should be noted that all devices reported so far are based on chip-like geometries.…”

Section: Introductionmentioning

confidence: 76%

Needle-type organic electrochemical transistor for spatially resolved detection of dopamine

et al. 2020

View full text Add to dashboard Cite

In this work, the advantages of carbon nanoelectrodes (CNEs) and orgonic electrochemical transistors (OECTs) were merged to realise nanometre-sized, spearhead OECTs based on single-and double-barrel CNEs functionalised with a conducting polymer film. The needle-type OECT shows a high aspect ratio that allows its precise positioning by means of a macroscopic handle and its size is compatible with single-cell analysis. The device was characterised with respect to its electrolyte-gated behaviour and was employed as electrochemical sensor for the proof-of-concept detection of dopamine (DA) over a wide concentration range (10 −12-10 −6 M). Upon application of fixed drain and gate voltages (V d = − 0.3 V, V g = − 0.9 V, respectively), the nano-sized needle-type OECT sensor exhibited a linear response in the low pM range and from 0.002 to 7 μM DA, with a detection limit of 1 × 10 −12 M.

show abstract

“…This is an interesting result, as much of the work to improve OMIEC device time response has focused on improving ion transport [37] and reducing device dimensions. [38,39] This work shows that even in such optimized settings bipolaron population dynamics likely present a limit to device speed. This begs the question, can OMIECs be designed to tailor electronic charge carrier population dynamics?…”

mentioning

confidence: 88%

Time-Resolved Structural Dynamics of Organic Mixed Ionic Electronic Conductors

Paulsen¹,

Wu²,

Takacs³

et al. 2020

Preprint

View full text Add to dashboard Cite

<div> <div> <div> <p>The structure and packing of organic mixed ionic-electronic conductors have an outsized effect on transport properties. In operating devices this structure is not fixed but is responsive to changes in electrochemical potential, ion intercalation, and solvent swelling. Towards this end, the dynamic structure of a model organic mixed conductor is characterized using multimodal time-resolved operando techniques. Time-resolved operando X-ray scattering reveals asymmetric rates of structural change during doping and dedoping that do not directly depend on potential or charging dynamics. Time-resolved spectroscopy establishes a link between structural transients and the complex dynamics of electronic charge carrier subpopulations, in particular the polaron-bipolaron equilibrium. These findings provide insight into the factors limiting the response time of organic mixed conductor based devices, and present the first real-time observation of the structural changes during doping and dedoping of a conjugated polymer system via X-ray scattering. </p> </div> </div> </div>

show abstract

Scaling Organic Electrochemical Transistors Down to Nanosized Channels

Cited by 26 publications

References 64 publications

Time‐Resolved Structural Kinetics of an Organic Mixed Ionic–Electronic Conductor

Time‐Resolved Structural Kinetics of an Organic Mixed Ionic–Electronic Conductor

Needle-type organic electrochemical transistor for spatially resolved detection of dopamine

Time-Resolved Structural Dynamics of Organic Mixed Ionic Electronic Conductors

Contact Info

Product

Resources

About