Conjugated Polyelectrolyte/Graphene Hetero‐Bilayer Nanocomposites Exhibit Temperature Switchable Type of Conductivity

Брус, В. В.; Gluba, Marc A.; Mai, Cheng‐Kang; Fronk, Stephanie L.; Rappich, Jörg; Nickel, N. H.; Bazan, Guillermo C.

doi:10.1002/aelm.201600515

Cited by 15 publications

(14 citation statements)

References 32 publications

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“…Efficient chemical doping, and thus the control of the work function, of graphene (in the range from 4.5 to 5.5 eV) can be realized not only by inorganic nanoparticles but also by organic molecules . Moreover, recently we have shown that a 2D hybrid organic–inorganic nanocomposite conjugated polyelectrolyte/graphene exhibits temperature switchable type of conductivity within a narrow temperature range from 30 to 90 °C . The observed temperature sensitive doping of graphene allows in situ controllable tuning of the energy alignment between the transparent graphene‐based electrode and an active organic layer.…”

Section: Electrodes For Semitransparent Oscsmentioning

confidence: 98%

Solution‐Processed Semitransparent Organic Photovoltaics: From Molecular Design to Device Performance

et al. 2019

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Recent research efforts on solution-processed semitransparent organic solar cells (OSCs) are presented. Essential properties of organic donor:acceptor bulk heterojunction blends and electrode materials, required for the combination of simultaneous high power conversion efficiency (PCE) and average visible transmittance of photovoltaic devices, are presented from the materials science and device engineering points of view. Aspects of optical perception, charge generation-recombination, and extraction processes relevant for semitransparent OSCs are also discussed in detail. Furthermore, the theoretical limits of PCE for fully transparent OSCs, compared to the performance of the best reported semitransparent OSCs, and options for further optimization are discussed. Hall of Fame ArticleAlthough the last decade has seen much progress in the field of OSC research, the development of semitransparent devices lags behind because of the lack of optimized photoactive materials. [22][23][24][25] The strong absorption of the active materials in the visible region causes difficulty when one tries to balance the power conversion efficiency (PCE) and transmittance. Encouragingly, the recent progress of fullerene-free OSCs has the potential to shed fundamental solutions to overcome these obstacles, hence becoming attractive research topics on developing narrow-bandgap nonfullerene acceptors to researchers. [26][27][28][29][30] We focus in this section on presenting recent progress in the design of narrow-bandgap organic semiconductors that have bandgaps less than 1.5 eV and have extended the boundaries of visible transparent/NIR absorbing OSC technology. Solution-Processable Organic SemiconductorsOrganic semiconductors are carbon-based materials with an electronically delocalized π-conjugated backbone. Such π-conjugated systems are created by a linear series of overlapping p z orbitals (π bonds). [31,32] As the parallel overlap of carbon p z orbitals increases with the molecular extension, the π bonds may further spread out into π bands, and this leads to a narrower energy bandgap. The energy of the highest occupied molecular orbital (HOMO) corresponds to the topmost π band, and the lowest π* band is referred to as the lowest unoccupied molecular orbital (LUMO). The energy gap between the HOMO and the LUMO dominates optical properties. Photoexcitations result in Coulombically bound excitons (electron-hole pairs) due to the low dielectric constant (ε ≈ 2−4) characteristic of organic semiconductors. [33,34] The exciton binding energy is in the range of 0.3−1 eV, thus requiring a high interfacial area between electron donor (D) and electron acceptor (A) components to promote exciton dissociation into free carriers. [35,36] This approach has led to the development of organic bulk heterojunctions (BHJs), which are cast from blend solutions of D and A components. [37][38][39] The excitonic nature of organic semiconductors offers an advantage in wavelength-specific light harvesting applications through a delicate manipulation of energy ...

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Section: Electrodes For Semitransparent Oscsmentioning

confidence: 98%

Solution‐Processed Semitransparent Organic Photovoltaics: From Molecular Design to Device Performance

et al. 2019

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“…The Hall effect measurements were carried out in air and at room temperature. 41 Silver paint was taken as a contact material.…”

Section: ■ Experimental Sectionmentioning

confidence: 99%

Fine Art of Thermoelectricity

Брус

Gluba

Rappich

et al. 2018

ACS Appl. Mater. Interfaces

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A detailed study of hitherto unknown electrical and thermoelectric properties of graphite pencil traces on paper was carried out by measuring the Hall and Seebeck effects. We show that the combination of pencil-drawn graphite and brush-painted poly(3,4-ethylenedioxythiophene) polystyrene sulfonate (PEDOT:PSS) films on regular office paper results in extremely simple, low-cost, and environmentally friendly thermoelectric power generators with promising output characteristics at low-temperature gradients. The working characteristics can be improved even further by incorporating ntype InSe flakes. The combination of pencil-drawn n-InSe:graphite nanocomposites and brush-painted PEDOT:PSS increases the power output by 1 order of magnitude.

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“…CPEs have been used in DNA-detection, thermoelectric devices, dye-sensitized solar cells, and as interlayers in organic light-emitting diodes (OLEDs), organic field-effect transistors (OFETs), and organic photovoltaics (OPVs). [36][37][38][39][40][41][42] Their water solubility in addition to their electronic and ionic conductivity makes them an ideal candidate for OECT applications. Accumulation mode OECTs using a CPE active layer have been fabricated in the past; however, their chemical structures have been limited to thiophene-based backbones.…”

Section: Introductionmentioning

confidence: 99%

Organic Electrochemical Transistors Based on the Conjugated Polyelectrolyte PCPDTBT‐SO₃K (CPE‐K)

et al. 2020

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PCPDTBT-SO3K (CPE-K), a conjugated polyelectrolyte, is presented as a mixed conductor material which can be used to fabricate high transconductance accumulation mode organic electrochemical transistors (OECTs). OECTs have been utilized in a wide range of applications such as analyte This article is protected by copyright. All rights reserved. 2 detection, neural interfacing, impedance sensing and neuromorphic computing. We demonstrate the use of interdigitated contacts to enable high transconductance in a relatively small device area in comparison to standard contacts. Such characteristics are highly desired in applications such as neural activity sensing, where device area must be minimized to reduce invasiveness. The physical and electrical properties of CPE-K have been fully characterized to allow a direct comparison to other top performing OECT materials. CPE-K demonstrates an electrical performance that is among the best that have been reported in the literature for OECT materials. In addition, CPE-K OECTs operate in the accumulation mode, which allows for much lower energy consumption in comparison to commonly used depletion mode devices.

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Conjugated Polyelectrolyte/Graphene Hetero‐Bilayer Nanocomposites Exhibit Temperature Switchable Type of Conductivity

Cited by 15 publications

References 32 publications

Solution‐Processed Semitransparent Organic Photovoltaics: From Molecular Design to Device Performance

Solution‐Processed Semitransparent Organic Photovoltaics: From Molecular Design to Device Performance

Fine Art of Thermoelectricity

Organic Electrochemical Transistors Based on the Conjugated Polyelectrolyte PCPDTBT‐SO₃K (CPE‐K)

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Conjugated Polyelectrolyte/Graphene Hetero‐Bilayer Nanocomposites Exhibit Temperature Switchable Type of Conductivity

Cited by 15 publications

References 32 publications

Solution‐Processed Semitransparent Organic Photovoltaics: From Molecular Design to Device Performance

Solution‐Processed Semitransparent Organic Photovoltaics: From Molecular Design to Device Performance

Fine Art of Thermoelectricity

Organic Electrochemical Transistors Based on the Conjugated Polyelectrolyte PCPDTBT‐SO3K (CPE‐K)

Contact Info

Product

Resources

About

Organic Electrochemical Transistors Based on the Conjugated Polyelectrolyte PCPDTBT‐SO₃K (CPE‐K)