A comprehensive study of infrared reflectivity of poly(3,4-ethylenedioxythiophene) model layers with different morphologies and conductivities

Louet, Charlotte; Cantin, Sophie; Dudon, Jean-Paul; Aubert, Pierre-Henri; Vidal, Frédéric; Chevrot, C.

doi:10.1016/j.solmat.2015.06.047

Cited by 35 publications

(20 citation statements)

References 64 publications

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“…This reduces the number of required layers compared with previous concepts employing additional metal electrode layers. 19,20 In turn, this enables more cost-effective and faster device production. This strategy requires that the polymer films remain conducting during device operation.…”

Section: Resultsmentioning

confidence: 99%

“…17,18 Comparatively, electrochromism of PEDOT in the IR wavelength range has been only sparsely reported. [19][20][21][22][23] While most reports on the electrochromism of PEDOT were limited to the visible and near IR regions, 16,23 many applications (road signs, safety clothing, space craft, etc.) could take advantage of an organic emissive modulator in the IR region.…”

Section: Introductionmentioning

confidence: 99%

“…Another study reported Fourier transform IR (FT-IR) reflectance of PEDOT. 19 Both examples employed inorganic metal electrodes (ITO or gold) to facilitate the switching of the devices. Other CPs like polyaniline blends have also been investigated for IR applications, showing high variation in emissivity and good electrochromic characteristics.…”

Section: Introductionmentioning

confidence: 99%

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Infrared electrochromic conducting polymer devices

et al. 2017

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The conducting polymer poly(3,4-ethylenedioxythiophene) (PEDOT) is well known for its electrochromic properties in the visible region. Less focus has been devoted to the infrared (IR) wavelength range, although tunable IR properties could enable a wide range of novel applications. As an example, modern day vehicles have thermal cameras to identify pedestrians and animals in total darkness, but road and speed signs cannot be easily visualized by these imaging systems. IR electrochromism could enable a new generation of dynamic road signs that are compatible with thermal imaging, while simultaneously providing contrast also in the visible region. Here, we present the first metal-free flexible IR electrochromic devices, based on PEDOT:Tosylate as both the electrochromic material and electrodes. Lateral electrochromic devices enabled a detailed investigation of the IR electrochromism of thin PEDOT:Tosylate films, revealing large changes in their thermal signature, with effective temperature changes up to 10 [degree]C between the oxidized (1.5 V) and reduced (-1.5 V) states of the polymer. Larger scale (7 [times] 7 cm) vertical electrochromic devices demonstrate practical suitability and showed effective temperature changes of approximately 7 [degree]C, with good optical memory and fast switching (1.9 s from the oxidized state to the reduced state and 3.3 s for the reversed switching). The results are highly encouraging for using PEDOT:Tosylate for IR electrochromic applications.

Funding agencies: Wenner-Gren Foundations; Swedish Research Council; Swedish Foundation for Strategic Research; AForsk Foundation; Knut and Alice Wallenberg Foundation (Tail of the sun), Vinnova as part of the Swedish national innovation program SIO Graphene; Swedish Gover

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Infrared electrochromic conducting polymer devices

et al. 2017

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“…1,2 Other applications include electrochromic displays and adaptive IR camouflaging. [3][4][5] Since the discovery of electrochromism in metal oxide films there have been many advancements in the field. 6,7 From device architecture modifications such as multiple layers 8 to material manipulations introducing composite substances, 9 improvements to the field of electrochromics have been widespread.…”

Section: Introductionmentioning

confidence: 99%

Controlling the electrochromic properties of conductive polymers using UV-light

et al. 2018

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“…The amount of polymer deposited on tip 1 was estimated through the charge density used in the polymerization process using a well know procedure. 54 The estimated volume of deposited polymer is always way below the volume between tip1 and tip 2 (cylinder of radius equal to the radius of tip 1 and a length L equal to the gap between tip1 and tip2). This indicates that the growth is not uniform and that dendrites or nanowires are generated.…”

Section: Methodsmentioning

confidence: 99%

Approaching the Frontier Between Fiber Devices and Single Molecule Devices in Redox Gated Junction

Ghilane

Lacroix

2015

J. Phys. Chem. C

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Charge transport in two conducting polymer poly(bithiophene) (PBT) and poly(ethylenedioxythiophene) (PEDOT) nanojunctions was investigated using two microelectrodes, separated by micrometric gap. Such junctions are redox gated and exhibit conductance switching between low and high resistance states at potential of 1 and 0V respectively. Devices with conductance between 100 nS-500 nS in the oxidized state were easily obtained, indicating control of the charge transport within the whole micrometric gap by a limited number of wires (less than 100 oligomeric strands). I/V characteristics and steady state conductance measurements, for various gate potential, indicates that on/off ratios measured can be as high as 1000 despite the small number of strands controlling the charge transport properties of the devices. Finally, we show that generating nano-junctions whose smallest diameter is below 4 nm on a length close to the size of a polaron, or its localization length, makes it possible to reach the frontier between fiber devices and single molecule devices.

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A comprehensive study of infrared reflectivity of poly(3,4-ethylenedioxythiophene) model layers with different morphologies and conductivities

Cited by 35 publications

References 64 publications

Infrared electrochromic conducting polymer devices

Infrared electrochromic conducting polymer devices

Controlling the electrochromic properties of conductive polymers using UV-light

Approaching the Frontier Between Fiber Devices and Single Molecule Devices in Redox Gated Junction

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