Terahertz and infrared transmission of an organic/inorganic hybrid thermoelectric material

Heyman, James; Alebachew, B. A.; Kaminski, Z. S.; Nguyen, Minh D.; Coates, Nelson E.; Urban, Jeffrey J.

doi:10.1063/1.4871316

Cited by 13 publications

(12 citation statements)

References 22 publications

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“…As a result, the C-C bond distance between (EDOT 6 ) +2 monomers is reduced from 1.42 to 1.40 Å when in proximity to the Te surface, characteristic of a benzoid to quinoid chain conformation change 23 . This conformational switch is also consistent with prior Terahertz spectroscopy studies that indicate charge-trapping near the polymer-Te nanowire surface 24,25 .…”

Section: Resultssupporting

confidence: 90%

Polymer morphology and interfacial charge transfer dominate over energy-dependent scattering in organic-inorganic thermoelectrics

et al. 2018

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Hybrid (organic-inorganic) materials have emerged as a promising class of thermoelectric materials, achieving power factors (S2σ) exceeding those of either constituent. The mechanism of this enhancement is still under debate, and pinpointing the underlying physics has proven difficult. In this work, we combine transport measurements with theoretical simulations and first principles calculations on a prototypical PEDOT:PSS-Te(Cux) nanowire hybrid material system to understand the effect of templating and charge redistribution on the thermoelectric performance. Further, we apply the recently developed Kang-Snyder charge transport model to show that scattering of holes in the hybrid system, defined by the energy-dependent scattering parameter, remains the same as in the host polymer matrix; performance is instead dictated by polymer morphology manifested in an energy-independent transport coefficient. We build upon this language to explain thermoelectric behavior in a variety of PEDOT and P3HT based hybrids acting as a guide for future work in multiphase materials.

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Section: Resultssupporting

confidence: 90%

Polymer morphology and interfacial charge transfer dominate over energy-dependent scattering in organic-inorganic thermoelectrics

et al. 2018

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“…This enhancement in conductivity could be attributed to a highly conductive PEDOT:PSS layer at the interface of the tellurium nanowires. 33,36,37 With a huge surface area to volume ratio, most nanostructures are susceptible to oxidation and/or chemical reactions at the interface. The PEDOT:PSS layer not only protects the tellurium (Te) nanowire from oxidation but also improves interparticle contact so that charges can easily and efficiently flow across the devicea key requirement for a thermoelectric device.…”

Section: Resultsmentioning

confidence: 99%

Bottom-up design of de novo thermoelectric hybrid materials using chalcogenide resurfacing

Sahu

Russ

et al. 2017

J. Mater. Chem. A

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The inability to simultaneously manipulate the thermal and electronic properties of conventional thermoelectric materials independently has impeded their progress and broad penetration into terrestrial applications. Hybrid organic/inorganic thermoelectric materials based on conducting polymers and inorganic nanostructures hold the potential to utilize both the inherently low thermal conductivity of the polymer and the superior charge transport properties of the inorganic component. While there are several successful examples of such materials, there currently exists no general design strategy for generating hybrid thermoelectric materials. Here, we combine molecular engineering at the organic/inorganic interface and simple processing techniques to demonstrate a modular approach enabling de novo design of complex hybrid thermoelectric systems. We chemically modify the surfaces of inorganic nanostructures and graft conductive polymers to yield robust solution processable p-type and n-type inorganic/organic hybrid nanostructures. We tailor the thermoelectric properties of these hybrid materials by varying the composition of the organic and inorganic components and observe novel nonmonotonic behavior in the electronic properties due to strong chemical interactions between the components, which leads to peak thermoelectric performance at intermediate concentrations. Broader ContextTraditional composites of organic and inorganic materials demonstrate additive properties, which can be modeled by effective medium theories. However, a hybrid material offers remarkable nonlinear properties that cannot be captured by standard effective medium principles. While organic/inorganic composites have been extensively used for their improved mechanical properties, only recently have they been exploited across extremely diverse fields such as catalysis, coatings, fuel cells, optics, photovoltaics and microelectronics. With a plethora of chemical strategies that involve integrative syntheses and innovative chemical resurfacing at the nanoscale now readily available, one can design structurally well-defined and complex hybrid nano-architectures with improved and/or unusual properties. Unfortunately, due to intrinsic chemical and morphological incongruences between hard and soft components in hybrid thermoelectric materials, it has proven extremely challenging to exert simultaneous and effective control over both charge and heat transport. We demonstrate, for the first time, a streamlined synthetic approach that allows integration of complementary functionalities in a wide-gamut of inorganic-organic hybrid systems designed specifically for thermoelectric applications. Notably, across several materials combinations, we observe electronic properties in these hybrid systems that strongly deviate from those of the individual componentsowing to new transport physics that emerges from strong interactions manifest at the nanoscale interfaces between the parent constituent materials. These results highlight the importance of controlling and ma...

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“…60 Recent measurements of the transport at high frequencies indicate that the complex composite materials have more de-localized electronic carriers that are critical in increasing the electrical conductivity, and hence improving the thermoelectric figure of merit. 61 The combined results of this work appear to provide a path toward enhanced transport and thermoelectric properties in this significant group of complex materials.…”

Section: Polymer-composite Thermoelectric Materialsmentioning

confidence: 92%

Innovative Thermoelectric Materials

Poehler¹,

Katz²

2016

Innovative Thermoelectric Materials

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Terahertz and infrared transmission of an organic/inorganic hybrid thermoelectric material

Cited by 13 publications

References 22 publications

Polymer morphology and interfacial charge transfer dominate over energy-dependent scattering in organic-inorganic thermoelectrics

Polymer morphology and interfacial charge transfer dominate over energy-dependent scattering in organic-inorganic thermoelectrics

Bottom-up design of de novo thermoelectric hybrid materials using chalcogenide resurfacing

Innovative Thermoelectric Materials

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