Graphene for Thermoelectric Applications: Prospects and Challenges

Amollo, Tabitha A.; Mola, Genene Tessema; Kirui, M. S. K.; Nyamori, Vincent O.

doi:10.1080/10408436.2017.1300871

Cited by 106 publications

(74 citation statements)

References 186 publications

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“…Besides, the intrinsically high electrical conductivity of graphene isn't sacrificed. The detailed information can be found in the review article …”

Section: Functional Components Of Stimesmentioning

confidence: 99%

Smart Textile‐Integrated Microelectronic Systems for Wearable Applications

et al. 2019

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The programmable nature of smart textiles makes them an indispensable part of an emerging new technology field. Smart textile‐integrated microelectronic systems (STIMES), which combine microelectronics and technology such as artificial intelligence and augmented or virtual reality, have been intensively explored. A vast range of research activities have been reported. Many promising applications in healthcare, the internet of things (IoT), smart city management, robotics, etc., have been demonstrated around the world. A timely overview and comprehensive review of progress of this field in the last five years are provided. Several main aspects are covered: functional materials, major fabrication processes of smart textile components, functional devices, system architectures and heterogeneous integration, wearable applications in human and nonhuman‐related areas, and the safety and security of STIMES. The major types of textile‐integrated nonconventional functional devices are discussed in detail: sensors, actuators, displays, antennas, energy harvesters and their hybrids, batteries and supercapacitors, circuit boards, and memory devices.

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“…Besides, the intrinsically high electrical conductivity of graphene isn't sacrificed. The detailed information can be found in the review article …”

Section: Functional Components Of Stimesmentioning

confidence: 99%

Smart Textile‐Integrated Microelectronic Systems for Wearable Applications

et al. 2019

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“…The lattice thermal conductivity of graphene is too high for efficient waste heat recovery, but it shows promise for use in TE cooling. However, besides regular approaches such as improving sample quality and adjusting carrier concentration [17][18][19][20][21], there is hardly any other effective way to further improve S while maintaining high σ in graphene [22]. A general approach to enhance S in graphene-like semimetals via is highly desired.…”

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confidence: 99%

Leveraging electron-phonon interaction to enhance the thermoelectric power factor in graphene-like semimetals

et al. 2019

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Electron-phonon interaction (EPI) is presumably detrimental for thermoelectric performance in semiconductors because it limits carrier mobility. Here we show that enhanced EPI with strong energy dependence offers an intrinsic pathway to significant increase in the Seebeck coefficient and the thermoelectric power factor, particularly in the context of two-dimensional (2D) graphene-like Dirac bands. The increase is realized by enabling electron energy filtering through preferential scattering of electron/hole carriers. We prove this concept by implementing state-of-the-art firstprinciples computational methods with explicit treatment of EPI for a 2D gapless MoS2 allotrope, which has both massless Dirac bands and a heavy-fermion state that acts as the filter. We determine that the optimal location of the heavy state and hence the onset of the filtering process is at the Dirac point. Our study opens a new avenue for attaining ultrahigh power factors via engineering the EPI in graphene-like semimetals or identifying new compounds that intrinsically possess the featured electronic structure.

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“…Bandgap opening is shown following the twisting of the bilayer graphene, which results in an increase of the Seebeck coefficient [48]. As shown in Figure 5(d) shows the ZT values of four TBNGRJs, four peak ZT values are more than 1 for the 21.8 o and 38.2 o rotation angles at 300 K. Particularly, in the 21.8 o rotation angle, the maximum ZT is 6.1, which is higher than most reported ZT values at room temperature [10,[49][50][51]. From Figure 5, the peaks of ZT higher than 1 exist in 21.8 o and 38.2 o rotation angles.…”

Section: = [ Cos ( ) −Sin ( ) Sin ( ) Cos ( ) ]mentioning

confidence: 74%

“…As a result, the key to improve the ZT of graphene devices is find a trade-off between the Seebeck coefficient, electrical conductance and heat transport coefficient. In prior studies, the specially designed nanostructured graphene can have increased Seebeck coefficient and suppressed heat transport coefficient without greatly reducing electrical conductance due to the quantum confinement effect [10,14,15]. In these graphene devices, graphene nanoribbons (GNRs) has demonstrated better thermoelectric performances as the Seebeck coefficient and ZT value can be increased by the finite size effect [16][17][18][19].…”

Section: Introductionmentioning

confidence: 99%

Enhanced thermoelectric performance of twisted bilayer graphene nanoribbons junction

Deng

Cai

Zhang

et al. 2019

Carbon

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We investigate the electron transport and thermoelectric property of twisted bilayer graphene nanoribbon junction (TBGNRJ) in 0 o , 21.8 o , 38.2 o and 60 o rotation angles by first principles calculation with Landauer-Buttiker and Boltzmann theories. It is found that TBGNRJs exhibit negative differential resistance (NDR) in 21.8 o and 38.2 o rotation angles under ±0.2 V bias voltage. More importantly, three peak ZT values of 2.0, 2.7 and 6.1 can be achieved in the 21.8 o rotation angle at 300K. The outstanding ZT values of TBGNRJs are interpreted as the combination of the reduced thermal conductivity and enhanced electrical conductivity at optimized angles.

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Graphene for Thermoelectric Applications: Prospects and Challenges

Cited by 106 publications

References 186 publications

Smart Textile‐Integrated Microelectronic Systems for Wearable Applications

Smart Textile‐Integrated Microelectronic Systems for Wearable Applications

Leveraging electron-phonon interaction to enhance the thermoelectric power factor in graphene-like semimetals

Enhanced thermoelectric performance of twisted bilayer graphene nanoribbons junction

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