Modulating Electronic Transport Properties of Carbon Nanotubes To Improve the Thermoelectric Power Factor<i>via</i>Nanoparticle Decoration

Yu, Choongho; Ryu, Yeontack; Yin, Liang; Yang, Hye Ran

doi:10.1021/nn102999h

Cited by 60 publications

(62 citation statements)

References 24 publications

(40 reference statements)

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“…One is to enhance the Seebeck coefficient or the PF using band structure engineering methods, [5] such as modifying the electronic density of states and Fermi energy through doping heteroatoms, reducing crystal symmetry to achieve high band edge degeneracy, [6][7][8] etc. The other is to reduce thermal conductivity using methods such as nanostructuring, [9][10][11][12][13][14][15][16][17][18][19][20][21] alloying, [14,[22][23][24][25][26] etc. These strategies have achieved significant progress in the past decade.…”

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confidence: 99%

Chemical Trends of Electronic Properties of Two-Dimensional Halide Perovskites and Their Potential Applications for Electronics and Optoelectronics

2016

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Current thermoelectric (TE) materials often have low performance or contain less abundant and/or toxic elements, thus limiting their large-scale applications. Therefore, new TE materials with high efficiency and low cost are strongly desirable. Here we demonstrate that, SiS and SiSe monolayers made from non-toxic and earth-abundant elements intrinsically have low thermal conductivities arising from their low-frequency optical phonon branches with large overlaps with acoustic phonon modes, which is similar to the state-of-the-art experimentally demonstrated material SnSe with a layered structure. Together with high thermal power factors due to their two-dimensional nature, they show promising TE performances with large figure of merit (ZT) values exceeding 1 or 2 over a wide range of temperatures. We establish some basic understanding of identifying layered materials with low thermal conductivities, which can guide and stimulate the search and study of other layered materials for TE applications.2 Thermoelectric materials have great potential for novel energy and environmental applications and have been extensively studied recently. The performance of a TE material is usually evaluated by the dimensionless figure of merit, which is denoted as ZT and defined as ZT = (S / ) , where S, σ, κ and T are the Seebeck coefficient, the electrical conductivity, the thermal conductivity (including both electronic contribution and lattice contribution ), and the average working temperature, respectively. [1][2][3][4] The product S σ is also known as the power factor (PF). To be an ideal TE material with high heat-to-electric conversion efficiency, a high ZT value, i.e., larger than unity, is required.Currently, two strategies are usually considered to enhance ZT of a TE material. One is to enhance the Seebeck coefficient or the PF using band structure engineering methods, [5] such as modifying the electronic density of states and Fermi energy through doping heteroatoms, reducing crystal symmetry to achieve high band edge degeneracy, [6][7][8] etc. The other is to reduce thermal conductivity using methods such as nanostructuring, [9][10][11][12][13][14][15][16][17][18][19][20][21] alloying, [14,[22][23][24][25][26] etc. These strategies have achieved significant progress in the past decade. However, most of now-existing TE materials, including PbTe, Bi 2 Te 3 and complex structure based TE materials, [3] strongly rely on heavy elements and/or rare-earth metals, which often have low abundance or are toxic, [3] thus limiting the large-scale employment of TE materials. Consequently, it will be of great importance to explore new TE materials not only with a high maximum ZT over a wide range of temperatures, but also made from non-toxic and earth-abundant elements.Recently, those materials with layered structures have shown such promise. As an experimentally demonstrated state-of-the-art thermoelectric material, SnSe has a simple layered structure similar to black phosphorus and only contains earth-abundant and non-toxic ...

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confidence: 99%

Chemical Trends of Electronic Properties of Two-Dimensional Halide Perovskites and Their Potential Applications for Electronics and Optoelectronics

2016

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“…Despite the wide variations in conducting organic materials and their compositions and morphologies, there have been only a limited number of strategies such as addition of CNT whose electronic mobility is high [16,17] and use of various anions [18] to alleviate this behavior. Such unusual behaviors were also observed when conducting polymers were combined with inorganic materials including nanoparticles [19], tellurium [20], and Bi 2 Te 3 [21].…”

Section: Introductionmentioning

confidence: 80%

Engineering electrical transport at the interface of conjugated carbon structures to improve thermoelectric properties of their composites

Wang

2016

Polymer

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“…has focused on hybrid composites in which the CNTs act as additives. These hybrid structures include structural polymer--CNTs, [69][70][71][72][73][74][75][76][77] conductive polymer--CNTs, 78-81 metal decorated CNTs [82][83][84] and solid--state compound--CNTs. [85][86][87] The main function of CNTs in the polymer is to facilitate the electron transport by creating electron transport pathways and retain the low thermal conductivity as illustrated in Figure 13.…”

Section: Other Hybrid Hetero--structures 41 Carbon Nanotube (Cnt)--bmentioning

confidence: 99%

Heterostructured Approaches to Efficient Thermoelectric Materials

Zhang

Stucky

2013

Chem. Mater.

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ABSTRACT:A key challenge for the materials chemist is the development of controllable and straightforward synthetic methodologies that will integrate multiple phases/compositions with scalar designed physical properties. The intent of this review is to give a brief summary of some of the current bulk--scaled approaches that might help guide researchers in the design of optimal hetero--structures in large quantity for the further improvement of thermoelectric conversion efficiency. Examples of two--phase combinations on different length scales will be discussed with a focus on the hot carrier filtering effect that results from the selective scattering of carriers with different energies. Based on this strategy, hetero--structures fabricated by both the bottom--up solution approaches at low temperature and top--down solid--state deposition routes that show promise in improving the thermoelectric figure of merit are highlighted, which may help guide researchers in the design of novel hetero--structures for further improvement.

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Modulating Electronic Transport Properties of Carbon Nanotubes To Improve the Thermoelectric Power FactorviaNanoparticle Decoration

Cited by 60 publications

References 24 publications

Chemical Trends of Electronic Properties of Two-Dimensional Halide Perovskites and Their Potential Applications for Electronics and Optoelectronics

Chemical Trends of Electronic Properties of Two-Dimensional Halide Perovskites and Their Potential Applications for Electronics and Optoelectronics

Engineering electrical transport at the interface of conjugated carbon structures to improve thermoelectric properties of their composites

Heterostructured Approaches to Efficient Thermoelectric Materials

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