Key issues in development of thermoelectric power generators: High figure-of-merit materials and their highly conducting interfaces with metallic interconnects

Aswal, D. K.; Basu, Ranita; Singh, Ajay

doi:10.1016/j.enconman.2016.01.065

Cited by 260 publications

(133 citation statements)

References 93 publications

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“…To optimize TE materials, the Power Factor ( PF = σS 2 ) must be increased without increasing the global thermal conductivity. This can be done by improving the carrier concentration and the mobility and/or reducing the lattice thermal conductivity K th by introducing scattering centers with point defects [4], interfaces [5], and nanostructuration [6]. …”

Section: Introductionmentioning

confidence: 99%

Thermoelectric and Transport Properties of Delafossite CuCrO2:Mg Thin Films Prepared by RF Magnetron Sputtering

et al. 2017

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P-type Mg doped CuCrO2 thin films have been deposited on fused silica substrates by Radio-Frequency (RF) magnetron sputtering. The as-deposited CuCrO2:Mg thin films have been annealed at different temperatures (from 450 to 650 °C) under primary vacuum to obtain the delafossite phase. The annealed samples exhibit 3R delafossite structure. Electrical conductivity σ and Seebeck coefficient S of all annealed films have been measured from 40 to 220 °C. The optimized properties have been obtained for CuCrO2:Mg thin film annealed at 550 °C. At a measurement temperature of 40 °C, this sample exhibited the highest electrical conductivity of 0.60 S·cm−1 with a Seebeck coefficient of +329 µV·K−1. The calculated power factor (PF = σS²) was 6 µW·m−1·K−2 at 40 °C and due to the constant Seebeck coefficient and the increasing electrical conductivity with measurement temperature, it reached 38 µW·m−1·K−2 at 220 °C. Moreover, according to measurement of the Seebeck coefficient and electrical conductivity in temperature, we confirmed that CuCrO2:Mg exhibits hopping conduction and degenerates semiconductor behavior. Carrier concentration, Fermi level, and hole effective mass have been discussed.

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Section: Introductionmentioning

confidence: 99%

Thermoelectric and Transport Properties of Delafossite CuCrO2:Mg Thin Films Prepared by RF Magnetron Sputtering

et al. 2017

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“…There are mainly two ways for overcoming this weak point. One is the introduction of nanostructures since they are expected to suppress the thermal conductivity and to enhance the Seebeck coefficient [1][2][3][4][5][6][7][8][9]. The other is the utilization of Si compounds such as SiGe alloy which is effective for suppressing the thermal conductivity because the scattering rate in phonon transport is promoted by lattice disturbance and strain originating from random arrangement of Si and Ge atoms [10][11][12][13][14].…”

Section: Introductionmentioning

confidence: 99%

Fabrication of ultrathin poly-crystalline SiGe-on-insulator layer for thermoelectric applications

et al. 2019

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For realizing high power generator efficiency based on thermoelectricity, Si, Ge and SiGe nanostructures have attracted attention. In this paper, we have investigated a new approach to fabricate an ultrathin polycrystalline SiGe-on-insulator (pc-SGOI) substrate by a simple process based on Si and Ge deposition followed by thermal diffusion suitable for thermoelectric devices. A 45-nmthick SGOI layer with a Ge fraction of nearly 0.45 was fabricated, and the Ge fraction was homogeneous in plane over the layer. Its thermal conductivity was 0.87 W mK −1 , lower than that of a single-crystalline SGOI layer. This is caused by the enhancement of scattering of phonons at grain boundaries in the pc-SGOI layer.

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“…Among described in Table 1, there is no investigation concerning the liquid turbine power generation via low temperature heats in contrast to enormous lambent outcomes for the former two technologies [7]- [13].…”

Section: Introductionmentioning

confidence: 99%

Feasibility Demonstrations of Liquid Turbine Power Generator Driven by Low Temperature Heats

Deguchi¹,

Isu²,

Kato³

et al. 2016

JPEE

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Lower temperature waste heats less than 373 K have strong potentials to supply additional energies because of their enormous quantities and ubiquity. Accordingly, reinforcement of power generations harvesting low temperature heats is one of the urgent tasks for the current generation in order to accomplish energy sustainability in the coming decades. In this study, a liquid turbine power generator driven by lower temperature heats below 373 K was proposed in the aim of expanding selectable options for harvesting low temperature waste heats less than 373 K. The proposing system was so simply that it was mainly composed of a liquid turbine, a liquid container with a biphasic medium of water and an underlying water-insoluble low-boiling-point medium in a liquid phase, a heating section for vaporization of the liquid and a cooling section for entropy discharge outside the system. Assumed power generating steps via the proposing liquid turbine power generator were as follows: step 1: the underlying low-boiling-point medium in a liquid phase was vaporized, step 2: the surfacing vapor bubbles of low-boiling-point medium accompanied the biphasic medium in their wakes, step 3: such high momentum flux by step 2 rotated the liquid turbine (i.e. power generation), step 4: the surfacing low-boiling-point medium vapor was gradually condensed into droplets, step 5: the low-boiling-point medium droplets were submerged to the underlying medium in a liquid phase. Experiments with a prototype liquid turbine power generator proved power generations in accordance with the assumed steps at a little higher than ordinary temperature. Increasing output voltage could be obtained with an increase in the cooling temperature among tested ranging from 294 to 296 K in contrast to normal thermal engines. Further improvements of the direct current voltage from the proposing liquid turbine power generator can be expected by means of far more vigorous multiphase flow induced by adding solid powders and theoretical optimizations of heat and mass transfers. S. Deguchi et al.60

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Key issues in development of thermoelectric power generators: High figure-of-merit materials and their highly conducting interfaces with metallic interconnects

Cited by 260 publications

References 93 publications

Thermoelectric and Transport Properties of Delafossite CuCrO2:Mg Thin Films Prepared by RF Magnetron Sputtering

Thermoelectric and Transport Properties of Delafossite CuCrO2:Mg Thin Films Prepared by RF Magnetron Sputtering

Fabrication of ultrathin poly-crystalline SiGe-on-insulator layer for thermoelectric applications

Feasibility Demonstrations of Liquid Turbine Power Generator Driven by Low Temperature Heats

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