Improved Alignment of PEDOT:PSS Induced by in-situ Crystallization of “Green” Dimethylsulfone Molecules to Enhance the Polymer Thermoelectric Performance

Zhu, Qiang; Yıldırım, Erol; Wang, Xizu; Soo, Xiang Yun Debbie; Zheng, Yun; Tan, Teck Leong; Wu, Gang; Yang, Shuo‐Wang; Xu, Jianwei

doi:10.3389/fchem.2019.00783

Cited by 39 publications

(18 citation statements)

References 47 publications

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“…In fact, a large broadening of DOS tail (~1 eV) has been reported in highly disordered PEDOT: PSS thin films using ultraviolet photoelectric spectroscopy measurements 16 , which agrees well with our fitted values of w for PEDOT:PSS. Several experiments were able to successfully align PEDOT, and hence enhance its electrical conductivity 17,18 . On the other hand, P3HT and PBTTT possess a distinct monomer structure with additional side chains, which help in enhancing the electronic coupling in the π−π stacking direction by facilitating the backbones to be aligned in 2D planes 19 .…”

Section: Resultsmentioning

confidence: 99%

Correlating charge and thermoelectric transport to paracrystallinity in conducting polymers

et al. 2020

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The conceptual understanding of charge transport in conducting polymers is still ambiguous due to a wide range of paracrystallinity (disorder). Here, we advance this understanding by presenting the relationship between transport, electronic density of states and scattering parameter in conducting polymers. We show that the tail of the density of states possesses a Gaussian form confirmed by two-dimensional tight-binding model supported by Density Functional Theory and Molecular Dynamics simulations. Furthermore, by using the Boltzmann Transport Equation, we find that transport can be understood by the scattering parameter and the effective density of states. Our model aligns well with the experimental transport properties of a variety of conducting polymers; the scattering parameter affects electrical conductivity, carrier mobility, and Seebeck coefficient, while the effective density of states only affects the electrical conductivity. We hope our results advance the fundamental understanding of charge transport in conducting polymers to further enhance their performance in electronic applications.

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Section: Resultsmentioning

confidence: 99%

Correlating charge and thermoelectric transport to paracrystallinity in conducting polymers

et al. 2020

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“…Luo et al 25 reported a power factor of 38.46 μW/m K 2 for PEDOT:PSS post-treated by 50% of 1-ethyl-3-methylimidazolium tetrafluoroborate (EMIMBF 4 ) ion liquid. Both Zhu et al 26 and Yildirum et al 27 recently reported a power factor of 32 μW/m K 2 by 3 wt % DMSO 2 loading of PEDOT:PSS.…”

Section: Introductionmentioning

confidence: 98%

Enhanced Power Factor of PEDOT:PSS Films Post-treated Using a Combination of Ethylene Glycol and Metal Chlorides and Temperature Dependence of Electronic Transport (325–450 K)

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Liang

Yang

et al. 2020

ACS Appl. Energy Mater.

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We report temperature dependence of electrical c o n d u c t i v i t y a n d t h e r m o p o w e r f o r p o l y ( 3 , 4ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS) thin films post-treated using a combination of an organic polar solvent of ethylene glycol (EG) and transition metal chlorides. The pristine and post-treated PEDOT:PSS films are characterized by X-ray diffraction (XRD), X-ray photoemission spectroscopy (XPS), atomic force microscopy (AFM), Raman spectroscopy techniques, and Hall effect measurements. Structural changes are confirmed by crystallinity improvement and Raman shift of the PEDOT:PSS, which correlate with a significant enhancement in thermoelectric power factor. The large variation of electronic transport in these films post-treated with three different metal chlorides can be attributed to the complex contribution of different conduction pathways. Among post-treated films, the highest electrical conductivity and power factor are attained for the EG/1 M ZnCl 2 post-treated PEDOT:PSS film with 1979 S/cm and 132 μW/m K 2 at 375 K. In general, organic conductive polymers have very low thermal conductivity; a zT = 0.24 at 375 K could be attained by assuming a thermal conductivity of 0.2 W/m-K. These results indicate that a combination of polar organic solvent EG and metal chlorides to post-treat a PEDOT:PSS film is a promising approach to enhance the thermoelectric properties of the conductive polymers of PEDOT:PSS.

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“…Studies showed that the s of PEDOT:PSS lms could be greatly enhanced with various post-treatment methods. [15][16][17][18][19][20][21][22][23] These post treatments enlarge the charge carrier concentration, and bipolaron are the main charge carriers. However, this high doping level results in a small S of PEDOT:PSS because of the extra charge carriers.…”

Section: Introductionmentioning

confidence: 99%

Modulation of the doping level of PEDOT:PSS film by treatment with hydrazine to improve the Seebeck coefficient

et al. 2020

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Improved Alignment of PEDOT:PSS Induced by in-situ Crystallization of “Green” Dimethylsulfone Molecules to Enhance the Polymer Thermoelectric Performance

Cited by 39 publications

References 47 publications

Correlating charge and thermoelectric transport to paracrystallinity in conducting polymers

Correlating charge and thermoelectric transport to paracrystallinity in conducting polymers

Enhanced Power Factor of PEDOT:PSS Films Post-treated Using a Combination of Ethylene Glycol and Metal Chlorides and Temperature Dependence of Electronic Transport (325–450 K)

Modulation of the doping level of PEDOT:PSS film by treatment with hydrazine to improve the Seebeck coefficient

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