Thermoelectric Properties of Highly Conductive Poly(3,4-ethylenedioxythiophene) Polystyrene Sulfonate Printed Thin Films

Beretta, Davide; Barker, Alex J.; Maqueira-Albo, Isis; Calloni, Alberto; Bussetti, Gianlorenzo; Dell’Erba, Giorgio; Luzio, Alessandro; Duó, Lamberto; Petrozza, Annamaria; Lanzani, Guglielmo; Caironi, Mario

doi:10.1021/acsami.7b04533

Cited by 30 publications

(24 citation statements)

References 56 publications

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“…Pristine PEDOT:PSS treated with NaBH 4 has a Seebeck coefficient of 20 µV·K −1 , which is similar to values seen in the literature [25]. This is double that of untreated EMIM: PEDOT:PSS composite films, as shown here and by others [26][27][28]. It is of note that the electrical conductivity for the NaBH 4 treated PEDOT:PSS film (Figure 2a) is higher than PEDOT:PSS.…”

Section: Post Treatment Of Emim:tfsi Films With Nabhsupporting

confidence: 89%

Enhanced Electrical Conductivity and Seebeck Coefficient in PEDOT:PSS via a Two-Step Ionic liquid and NaBH4 Treatment for Organic Thermoelectrics

et al. 2020

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A two-step approach of improving the thermoelectric properties of Poly(3,4-ethylenedioxythiophene)poly(4-styrenesulfonate) (PEDOT:PSS) via the addition of the ionic liquid, 1-Ethyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide (EMIM:TFSI) and subsequent reduction with NaBH4 is presented. The addition of 2.5 v/v% of EMIM:TFSI to PEDOT:PSS increases the electrical conductivity from 3 S·cm−1 to 1439 S·cm−1 at 40 °C. An additional post treatment using the reducing agent, NaBH4, increases the Seebeck coefficient of the film from 11 µV·K−1 to 30 µV·K−1 at 40 °C. The combined treatment gives an overall improvement in power factor increase from 0.04 µW·m−1·K−2 to 33 µW·m−1·K−2 below 140 °C. Raman and XPS measurements show that the increase in PEDOT:PSS conductivity is due to PSS separation from PEDOT and a conformational change of the PEDOT chains from the benzoid to quinoid molecular orientation. The improved Seebeck coefficient is due to a reduction of charge carriers which is evidenced from the UV–VIS depicting the emergence of polarons.

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Section: Post Treatment Of Emim:tfsi Films With Nabhsupporting

confidence: 89%

Enhanced Electrical Conductivity and Seebeck Coefficient in PEDOT:PSS via a Two-Step Ionic liquid and NaBH4 Treatment for Organic Thermoelectrics

et al. 2020

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“…The electronic contribution (K E ) to the thermal conductivity was thus estimated to be minor (<0.01 W m −1 K −1 ), indicating that the lattice thermal conductivity is dominant in the doped PTEG-2 films. We explored anisotropy effects by measuring the out-of-plane thermal conductivity (κ ⊥ via time-domain thermoreflectance (TDTR)) 50,51 (see details in Supplementary Note 5 and Supplementary Fig. S9).…”

Section: Resultsmentioning

confidence: 99%

N-type organic thermoelectrics: demonstration of ZT > 0.3

et al. 2020

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The ‘phonon-glass electron-crystal’ concept has triggered most of the progress that has been achieved in inorganic thermoelectrics in the past two decades. Organic thermoelectric materials, unlike their inorganic counterparts, exhibit molecular diversity, flexible mechanical properties and easy fabrication, and are mostly ‘phonon glasses’. However, the thermoelectric performances of these organic materials are largely limited by low molecular order and they are therefore far from being ‘electron crystals’. Here, we report a molecularly n-doped fullerene derivative with meticulous design of the side chain that approaches an organic ‘PGEC’ thermoelectric material. This thermoelectric material exhibits an excellent electrical conductivity of >10 S cm−1 and an ultralow thermal conductivity of <0.1 Wm−1K−1, leading to the best figure of merit ZT = 0.34 (at 120 °C) among all reported single-host n-type organic thermoelectric materials. The key factor to achieving the record performance is to use ‘arm-shaped’ double-triethylene-glycol-type side chains, which not only offer excellent doping efficiency (~60%) but also induce a disorder-to-order transition upon thermal annealing. This study illustrates the vast potential of organic semiconductors as thermoelectric materials.

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“…As a result, vapor phase polymerized PEDOT:Tos films exhibit power factors as high as 454 μW/m•K 2 . In recent years, more studies support the beneficial effect of crystallinity on the thermoelectric properties of PEDOT derivatives [21,[54][55][56][57].…”

Section: Tuning Of the Morphologymentioning

confidence: 96%

Thermoelectric materials and applications for energy harvesting power generation

Petsagkourakis

Tybrandt

Crispin

et al. 2018

Science and Technology of Advanced Materials

451

239

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Thermoelectrics, in particular solid-state conversion of heat to electricity, is expected to be a key energy harvesting technology to power ubiquitous sensors and wearable devices in the future. A comprehensive review is given on the principles and advances in the development of thermoelectric materials suitable for energy harvesting power generation, ranging from organic and hybrid organic-inorganic to inorganic materials. Examples of design and applications are also presented.

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Thermoelectric Properties of Highly Conductive Poly(3,4-ethylenedioxythiophene) Polystyrene Sulfonate Printed Thin Films

Cited by 30 publications

References 56 publications

Enhanced Electrical Conductivity and Seebeck Coefficient in PEDOT:PSS via a Two-Step Ionic liquid and NaBH4 Treatment for Organic Thermoelectrics

Enhanced Electrical Conductivity and Seebeck Coefficient in PEDOT:PSS via a Two-Step Ionic liquid and NaBH4 Treatment for Organic Thermoelectrics

N-type organic thermoelectrics: demonstration of ZT > 0.3

Thermoelectric materials and applications for energy harvesting power generation

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