Defect and Dopant Mediated Thermoelectric Power Factor Tuning in β‐Zn<sub>4</sub>Sb<sub>3</sub>

Karthikeyan, Vaithinathan; Li, Tan; Medasani, Bharat; Luo, Ching Hsing; Shi, Dongliang; Wong, J. C. K.; Lam, Kwok Ho; Ling, C. C.; Roy, Vellaisamy A. L.

doi:10.1002/aelm.201901284

Cited by 14 publications

(9 citation statements)

References 49 publications

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“…Strong counter-ion-induced localization of the charge carriers can interrupt the delocalization of holes in the polymer chain. [60,61] A high Seebeck coefficient in adduct-doped polymers could conceivably be due to an ionic thermogalvanic effect, although we would not expect adducts to be more mobile than the separated ions, or to an energy-filtering contribution. [62,63] The highest power factor obtained was 50 µW m −1 K −2 when DPP(TT) 1 -(EDOT) 1 was doped with oligo_ DPP(EDOT) 2 :B(C 6 F 5 ) 3 .…”

Section: Conductivity Measurements Thermoelectric Studies and Stabilitymentioning

confidence: 90%

Stable High‐Conductivity Ethylenedioxythiophene Polymers via Borane‐Adduct Doping

Mukhopadhyaya

Lee

Ganley

et al. 2022

Adv Funct Materials

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Efficient doping of polymer semiconductors is required for high conductivity and efficient thermoelectric performance. Lewis acids, e.g., B(C6F5)3, have been widely employed as dopants, but the mechanism is not fully understood. 1:1 “Wheland type” or zwitterionic complexes of B(C6F5)3 are created with small conjugated molecules 3,6‐bis(5‐(7‐(5‐methylthiophen‐2‐yl)‐2,3‐dihydrothieno[3,4‐b][1,4]dioxin‐5‐yl)thiophen‐2‐yl)‐2,5‐dioctyl‐2,5‐dihydropyrrolo[3,4‐c]pyrrole‐1,4‐dione [oligo_DPP(EDOT)2] and 3,6‐bis(5''‐methyl‐[2,2':5',2''‐terthiophen]‐5‐yl)‐2,5‐dioctyl‐2,5‐dihydropyrrolo[3,4‐c]pyrrole‐1,4‐dione [oligo_DPP(Th)2]. Using a wide variety of experimental and computational approaches, the doping ability of these Wheland Complexes with B(C6F5)3 are characterized for five novel diketopyrrolopyrrole‐ethylenedioxythiophene (DPP‐EDOT)‐based conjugated polymers. The electrical properties are a strong function of the specific conjugated molecule constituting the adduct, rather than acidic protons generated via hydrolysis of B(C6F5)3, serving as the oxidant. It is highly probable that certain repeat units/segments form adduct structures in p‐type conjugated polymers which act as intermediates for conjugated polymer doping. Electronic and optical properties are consistent with the increase in hole‐donating ability of polymers with their cumulative donor strengths. The doped film of polymer (DPP(EDOT)2‐(EDOT)2) exhibits exceptionally good thermal and air‐storage stability. The highest conductivities, ≈300 and ≈200 S cm−1, are achieved for DPP(EDOT)2‐(EDOT)2 doped with B(C6F5)3 and its Wheland complexes.

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Section: Conductivity Measurements Thermoelectric Studies and Stabilitymentioning

confidence: 90%

Stable High‐Conductivity Ethylenedioxythiophene Polymers via Borane‐Adduct Doping

Mukhopadhyaya

Lee

Ganley

et al. 2022

Adv Funct Materials

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“…2 shows the maximum ZT achieved for bulk thermoelectric materials over the past six years as a function of temperature. 33–234…”

Section: Strategiesmentioning

confidence: 99%

Recent advances in designing thermoelectric materials

2022

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“…4,11,12 However, electrical conductivity enhancement was significantly unpredictable due to the reduction in carrier mobility from the interfacial boundary scattering. 13 In addition, to improve thermoelectric performance, nanocompositing also enhances the mechanical properties, which are essential for devices' operational durability and manufacturing process. 10 In addition to high thermoelectric performance (ZT), earthabundance, phase and mechanical stability, and nontoxicity are the other desired characteristics for developing large-scale commercialization.…”

Section: ■ Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Probing the Effect of MWCNT Nanoinclusions on the Thermoelectric Performance of Cu₃SbS₄ Composites

et al. 2022

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Recently, copper-based chalcogenides, especially sulfides, have attracted considerable attention due to their inexpensive, earth-abundance, nontoxicity, and good thermoelectric performance. Cu 3 SbS 4 is one such kind with p-type conductivity and high phase stability for potential medium-temperature applications. In this article, the effect of a multiwalled carbon nanotube (MWCNT) on the thermoelectric parameters of Cu 3 SbS 4 is studied. A facile synthesis route of mechanical alloying (MA), followed by hot pressing (HP) was utilized to achieve dense and fine-grain samples. Adding the optimal amount of MWCNT nanoinclusions in Cu 3 SbS 4 enhanced the Seebeck coefficient by carrier energy filtering and reduced the thermal conductivity by strong phonon scattering mechanisms. This synergistic optimization helped achieve the maximum figure of merit (ZT) of 0.43 in the 3 mol % MWCNT nanoinclusion composite sample, which is 70% higher than the pristine Cu 3 SbS 4 at 623 K. In addition, enhancement in mechanical stability is observed with the increasing nanoinclusion concentration. Dispersion strengthening and grain boundary hardening mechanisms help improve mechanical stability in the nanocomposite samples. Apart from the enhanced mechanical stability, our study highlights that the incorporation of multiwalled CNT nanoinclusions boosted the thermoelectric performance of Cu 3 SbS 4 , and the same strategy can be extended to other next-generation and conventional thermoelectric materials.

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Defect and Dopant Mediated Thermoelectric Power Factor Tuning in β‐Zn₄Sb₃

Abstract: merit is used to characterize the material performance which is expressed as zT ( ) 2 2

Cited by 14 publications

References 49 publications

Stable High‐Conductivity Ethylenedioxythiophene Polymers via Borane‐Adduct Doping

Stable High‐Conductivity Ethylenedioxythiophene Polymers via Borane‐Adduct Doping

Recent advances in designing thermoelectric materials

Probing the Effect of MWCNT Nanoinclusions on the Thermoelectric Performance of Cu₃SbS₄ Composites

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Defect and Dopant Mediated Thermoelectric Power Factor Tuning in β‐Zn4Sb3

Abstract: merit is used to characterize the material performance which is expressed as zT ( ) 2 2

Cited by 14 publications

References 49 publications

Stable High‐Conductivity Ethylenedioxythiophene Polymers via Borane‐Adduct Doping

Stable High‐Conductivity Ethylenedioxythiophene Polymers via Borane‐Adduct Doping

Recent advances in designing thermoelectric materials

Probing the Effect of MWCNT Nanoinclusions on the Thermoelectric Performance of Cu3SbS4 Composites

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About

Defect and Dopant Mediated Thermoelectric Power Factor Tuning in β‐Zn₄Sb₃

Probing the Effect of MWCNT Nanoinclusions on the Thermoelectric Performance of Cu₃SbS₄ Composites