Enhanced high temperature thermoelectric response of sulphuric acid treated conducting polymer thin films

Kumar, S. R. Sarath; Kurra, Narendra; Alshareef, Husam N.

doi:10.1039/c5tc03145a

Cited by 80 publications

(39 citation statements)

References 37 publications

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“…2b,d ). This result demonstrates that the morphological rearrangement of PEDOT and PSS by the addition of Iso-GMA facilitates the highly interconnected PEDOT chains inside the fibril network, providing better pathways for charge transport 5 , 37 , 38 . When Iso-GMA concentration was increased from 0.8 to 1.6 vol%, the sheet resistance increased from 81.60 to 93.00 ohm sq −1 .…”

Section: Resultsmentioning

confidence: 79%

Structural and Morphological Evolution for Water-resistant Organic Thermoelectrics

Jang

Kim

et al. 2017

Sci Rep

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We systematically investigated the effect of 2,5-bis(2-hydroxy-3-methacryloyloxypropoxy)-1,4:3,6-dianhydro-sorbitol (Iso-GMA) with different concentrations on the structural and morphological evolution of poly(3,4-ethylenedioxythiophene):poly(styrene sulfonate) (PEDOT:PSS) containing a fixed volume of dimethyl sulfoxide (DMSO) to realize water-resistant organic thermoelectric devices. As an additive, Iso-GMA is a hydrophilic and crosslinking agent that can interact with PEDOT and PSS chains by hydrogen bonding and/or dipole-dipole- or dipole-charge-interaction. The Seebeck coefficient and power factor in the film incorporating 3.0 vol% DMSO and 0.8 vol% Iso-GMA were respectively 1.82 × 102 and 1.53 × 105% higher than those of the pristine PEDOT:PSS film without additives (DMSO and Iso-GMA). These results can be attributed to the self-assembled and crosslinked fibril networks with optimized phase separation, where the film has densely-packed PEDOT and highly lamellar-stacked PSS. Also, the reduced charge carrier concentration from the structural characteristics originated in the higher thermoelectric properties. We introduced the schematic illustration to understand the chemical bonding among the components and the morphological evolution according to the Iso-GMA concentration. The increased mechanical strength by the interchain stacking degree of PEDOT and the crosslinking of Iso-GMA facilitate the film remained in a water bath for 0.5 h without physical degradation, and sustain the thermoelectric properties during 12 h in humid conditons.

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Section: Resultsmentioning

confidence: 79%

Structural and Morphological Evolution for Water-resistant Organic Thermoelectrics

Jang

Kim

et al. 2017

Sci Rep

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“…The observed bathochromic shifts can be ascribed to doping of P3HTN by PSS after the counterion exchange occurs. Doping of PEDOT by PSS is a well-documented phenomenon and thus, a similar doping effect can be expected after formation of the ionic complex between P3HTN and PSS [32]. When doped, the absorption of P3HT undergoes a bathochromic shift, which is also associated with the appearance of a new absorption shoulder between 700 and 1000 nm [33,34].…”

Section: Resultsmentioning

confidence: 79%

Water-Processed Organic Solar Cells with Open-Circuit Voltages Exceeding 1.3V

2020

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Conjugated polyelectrolytes are commonly employed as interlayers to modify organic solar cell (OSC) electrode work functions but their use as an electron donor in water-processed OSC active layers has barely been investigated. Here, we demonstrate that poly[3-(6’-N,N,N-trimethyl ammonium)-hexylthiophene] bromide (P3HTN) can be employed as an electron donor combined with a water-soluble fullerene (PEG-C60) into eco-friendly active layers deposited from aqueous solutions. Spin-coating a poly(3,4-ethylenedioxythiophene):polystyrene sulfonate (PEDOT:PSS) layer prior to the P3HTN:PEG-C60 active layer deposition considerably increases the open-circuit voltage (Voc) of the OSCs to values above 1.3 V. Along with this enhanced Voc, the OSCs fabricated with the PEDOT:PSS interlayers exhibit 10-fold and 5-fold increases in short-circuit current density (Jsc) with respect to those employing bare indium tin oxide (ITO) and molybdenum trioxide coated ITO anodes, respectively. These findings suggest that the enhanced Jsc and Voc in the water-processed OSCs using the PEDOT:PSS interlayer cannot be solely ascribed to a better hole collection but rather to ion exchanges taking place between PEDOT:PSS and P3HTN. We investigate the optoelectronic properties of the newly formed polyelectrolytes using absorption and photoelectron spectroscopy combined with hole transport measurements to elucidate the enhanced photovoltaic parameters obtained in the OSCs prepared with PEDOT:PSS and P3HTN.

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“…In the present work, poly(ethersulfone) was selected for its superior properties as a polymer electrolyte membrane functionalized by insertion of sulfonic acid groups in the polymeric backbone. It is reported that the conductivity in polymers with aromatic structure (e.g., PES) is increased with sulfonation degree and has a strong impact on conductivity and membrane stability [27][28][29].…”

Section: Introductionmentioning

confidence: 99%

Hybrid nanocomposite membranes of sulfonated poly(ethersulfone)/1,1-carbonyl diimidazole/1-(3-aminopropyl)-silane/silica for direct methanol fuel cells

Khosravi

Hassanajili

Moslemin

et al. 2016

Korean J. Chem. Eng.

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Composite membranes of sulfonated poly(ethersulfone)/1,1-carbonyl diimidazole/1-(3-aminopropyl)-silane/silica (SPES/CDI/AS/SiO 2 ) with silica of various contents (3, 5 and 8 wt%) were prepared as electrolytes for direct methanol fuel cells (DMFCs). Comparison was made with pure SPES and SPES/SiO 2 . The properties of the composite membranes were studied by FTIR, TGA, XRD, water and methanol uptake, proton conductivity. SPES/CDI/AS/SiO 2 membranes were also characterized by scanning electron microscopy (SEM), which showed good adhesion between the modified sulfonic acid (-SO 3 H) groups of SPES and silica because of cross-linking with covalent bond formation and reduced cavities in the composites. This effect played an important role in reducing water uptake, methanol uptake and methanol permeability of the SPES/CDI/AS/SiO 2 composites. The water and methanol uptake and also methanol permeability of the SPES/CDI/AS/SiO 2 composite membrane with 8% SiO 2 were found in the order 3.58%, 2.48% and 1.91×10 −7 (cm 2 s −1 ), lower than those of SPES and Nafion 117. In SPES membrane of 16.94% level of sulfonation, the proton conductivity was 0.0135 s/cm at 25 o C, which approached that of Nafion 117 under the same conditions. Also, the proton conductivity of the SPES/CDI/AS/SiO 2 8% membrane was 0.0186 s/cm, which was higher than that of SPES at room temperature. The preparation of SPES/SiO 2 composites in the presence of AS and CDI, led to 63%, 56% and 64% reduction of water uptake, methanol uptake and methanol permeability, respectively without a sharp drop in proton conductivity of the composite membranes which featured a good balance between high proton conductivity, water and methanol uptake of SPES/CDI/AS/SiO 2 membranes.

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Enhanced high temperature thermoelectric response of sulphuric acid treated conducting polymer thin films

Abstract: Enhanced thermoelectric response of acid treated conducting polymer thin films.

Cited by 80 publications

References 37 publications

Structural and Morphological Evolution for Water-resistant Organic Thermoelectrics

Structural and Morphological Evolution for Water-resistant Organic Thermoelectrics

Water-Processed Organic Solar Cells with Open-Circuit Voltages Exceeding 1.3V

Hybrid nanocomposite membranes of sulfonated poly(ethersulfone)/1,1-carbonyl diimidazole/1-(3-aminopropyl)-silane/silica for direct methanol fuel cells

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