Thin Film Thermoelectric Metal–Organic Framework with High Seebeck Coefficient and Low Thermal Conductivity

Erickson, Kenneth L.; Léonard, François; Stavila, Vitalie; Foster, Michael E.; Spataru, Catalin D.; Jones, Reese E.; Foley, Brian M.; Hopkins, Patrick E.; Allendorf, Mark D.; Talin, A. Alec

doi:10.1002/adma.201501078

Cited by 252 publications

(242 citation statements)

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“…The measured high positive Seebeck coefficient of polycrystalline MOF films indicates the MOF films are p-type, so that the majority of charge carriers are holes, which is consistent with the reported work. 6 The Seebeck coefficient of TCNQ loaded MOF film linearly increases from 342.39 μV/K to 422.32 μV/K as temperature rising from 290 K to 350 K. It may be attributed to the fact that thermal activation generates more holes contributing to the Seebeck coefficient as the temperature is increasing. A maximum Seebeck coefficient would be expected at higher temperature where intrinsic transport behavior starts to dominate.…”

Section: Resultsmentioning

confidence: 95%

“…3 This renders MOF materials a novel and promising material for microelectronic devices, 4 sensors, 5 and thermoelectric devices. 6 Karlsruhe Institute of Technology (KIT) recently reported a resistive switching nano-device based on SURMOF films, demonstrating a potential application of SURMOF materials for nonvolatile RRAM memories. 4 Another research group from Sandia National Laboratory reported MOF films exhibiting high Seebeck coefficients and low thermal conductivity, demonstrating that MOF films could function as novel thermoelectrical materials.…”

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confidence: 99%

“…4 Another research group from Sandia National Laboratory reported MOF films exhibiting high Seebeck coefficients and low thermal conductivity, demonstrating that MOF films could function as novel thermoelectrical materials. 6 Semiconductor thermoelectric (TE) materials such as Bi 2 Te 3 and PbTe have been applied for TE power generator or TE refrigerator. But it is still limited for large scale application due to its highly cost, non-eco-friendly and difficulty of large scale production.…”

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Seebeck Coefficient Measurements of Polycrystalline and Highly Ordered Metal-Organic Framework Thin Films

Chen

Wang

Hassan

et al. 2017

ECS J. Solid State Sci. Technol.

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In this work highly oriented Surface Anchored Metal-Organic Framework (SURMOF) films were fabricated quasi-epitaxial and were electrically characterized by Seebeck analysis and benchmarked against random polycrystalline MOF films loaded with tetracyano-quinodimethane (TCNQ) infiltration. The horizontal Seebeck coefficient of the oriented SURMOF films and the random polycrystalline MOF films parallel to the sample surface was measured and has been discussed. The isotropic random polycrystalline MOF films exhibit a high positive Seebeck coefficient of 422.32 μV/K at 350 K. However, the horizontal Seebeck coefficient of highly oriented SURMOF films fluctuates around 0 μV/K instead. Because the quasi-epitaxial oriented SURMOF films are highly anisotropic, there is no measurable horizontal carrier transport parallel to the SURMOF surface. However, in contrast to highly oriented (002) SURMOF films, the in-plane thermoelectric properties of random polycrystalline MOF films with sputtered Au contact pads could be measured due to the isotropic nature of these films. The high Seebeck coefficient of these random polycrystalline MOF films demonstrates promising application potential of MOF films in future thermoelectric and electronic devices.

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Section: Resultsmentioning

confidence: 95%

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confidence: 99%

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confidence: 99%

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Seebeck Coefficient Measurements of Polycrystalline and Highly Ordered Metal-Organic Framework Thin Films

Chen

Wang

Hassan

et al. 2017

ECS J. Solid State Sci. Technol.

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“…S3, ESI †). 45,46 A low thermal conductivity of around 0.30-0.42 W m K À1 in the temperature range of 299 to 424 K was observed for this perovskite single crystal (Fig. 4), and this value was much smaller than that of the pure or La doped SrTiO 3 perovskites (4.5-7 W m K À1 ).…”

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Ultra-high Seebeck coefficient and low thermal conductivity of a centimeter-sized perovskite single crystal acquired by a modified fast growth method

Wang

et al. 2017

J. Mater. Chem. C

114

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A centimeter-sized organic-inorganic hybrid lead-based perovskite CH 3 NH 3 PbI 3 (MAPbI 3 ) single crystal was obtained by using a modified fast and inverse-temperature growth method. The optical properties of this single crystal at room and low temperatures were studied in terms of optical absorption and photoluminescence measurements. The single crystal exhibited optical properties with a band-gap of 1.53 eV, which is comparable to a reported value. The temperature-dependent UV-vis spectra of this perovskite single crystal showed a unique structural phase transition as the temperatures varied. The These thermoelectric characteristics would be useful for potential thermoelectric applications if the electrical conductivity of this crystal is improved by tuning its composition.

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“…An attractive application that combines electrical conductivity with the nanoporous structure is resistive chemical sensing, whereby targeted molecules to be sensed can infi ltrate the MOF pores and change the conductivity. 21 Along the same lines, the nanoporous structure should also be benefi cial for thermoelectrics, 22 where the nanoporous MOF structure should give inherently low thermal conductivity, and the large number of ligands and metal centers could allow for tuning of the Seebeck coeffi cient. A similar situation occurs for battery electrodes, 23 since a conducting MOF can afford high-charge capacity due to the high pore-to-volume ratio.…”

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Metal–organic frameworks for electronics and photonics

Dincă

Léonard

2016

MRS Bull.

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Metal-organic frameworks (MOFs) 1 are coordination polymers that exhibit long-range order (i.e., crystallinity) and permanent porosity with pores ranging in size from 0.2 nm to more than 3 nm, thus spanning the microporous (pores less than 2 nm) and mesoporous (pores less than 50 nm) regimes. MOFs form by self-assembly processes involving metal ions and organic ligands bearing at least two (often more) metal-binding functional groups ( Figure 1 ). The latter play an essential role because the bond established between the metal ions and the organic ligands is the weakest link in the ensuing material, defi ning the stability with respect to all outside stimuli: temperature, moisture, and energy input. The most commonly used metal-binding functionalities are carboxylic acids, although other acidic (e.g., azoles, 2 phosphonic acids 3 ) and neutral (e.g., pyridines) ligands are becoming prominent, especially in view of the relatively weak bond formed between carboxylates and late fi rst-row transition metals, which comprise the vast majority of existing MOF structures.Most often, the self-assembly process leads to aggregation of metal ions into secondary-building units (SBUs), which are multinuclear metal clusters with more complex structural and electronic features than single-metal ions. 4 It is the combination of diverse SBUs and a wide variety of potential organic ligands that has given rise to thousands of MOFs thus far that differ in topology, pore size and shape, and chemical composition. Indeed, MOFs form one of the most diverse classes of materials in existence today, offering tunability at the level of the metal ions, the organic ligands, and the functional groups connecting the two.The most prominent use of MOFs to date takes advantage of their extreme porosity and the ability to change the polarity, size, shape, and chemical composition of the pore surface. These factors have enabled applications in, for example, gas storage, 5 in diffi cult gas separations, 6 and in catalysis. 7 -9 These prominent applications take advantage of the molecular nature of MOFs, which allow the treatment of solid-substrate interactions locally, on the molecular scale. The utility of MOFs in applications requiring energy or charge transport is limited, however, because the electronic structure of nearly all MOFs show essentially fl at bands with minimal band dispersion. Put another way, the electronic states in MOFs are localized and are best described as molecular orbitals rather than delocalized, band-like states. Although the absence of disperse bands need not affect exciton transport or charge hopping, which can enable interesting applications on their own (as highlighted by the articles in this issue), increased band dispersion is critical for long-range charge transport and high-charge mobility, as required for most electronic applications. Recent reports have Metal-organic frameworks for electronics and photonics Mircea Dinc ȃ and François Léonard , Guest EditorsMetal-organic frameworks (MOFs), with their crystalline ...

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Thin Film Thermoelectric Metal–Organic Framework with High Seebeck Coefficient and Low Thermal Conductivity

Cited by 252 publications

References 28 publications

Seebeck Coefficient Measurements of Polycrystalline and Highly Ordered Metal-Organic Framework Thin Films

Seebeck Coefficient Measurements of Polycrystalline and Highly Ordered Metal-Organic Framework Thin Films

Ultra-high Seebeck coefficient and low thermal conductivity of a centimeter-sized perovskite single crystal acquired by a modified fast growth method

Metal–organic frameworks for electronics and photonics

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