Optimized thermoelectric performance in thin (Bi2Se3)1−x(Bi2Te3)x alloyed films

Adam, A.M.; Diab, A.K.; Ataalla, M.; Alotaibi, Maged F.; Alharbi, Abdulaziz N.; Elsehly, Emad M.

doi:10.1016/j.jallcom.2021.162888

Cited by 21 publications

(8 citation statements)

References 34 publications

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“…where both the activation energy of materials and E f are comparable. This confirmed the mechanism of bandgap conduction to be dominant for carrier transport for high-temperature range [213]. Oga Norimasa et al reported the effect of bent states of flexible Bi 2 Te 3 thin films on electrical and thermal transport properties during deposition as well as post thermal annealing.…”

Section: Dimensionality Effectsupporting

confidence: 55%

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Physics and technology of thermoelectric materials and devices

Dadhich

Saminathan

Kumari

et al. 2023

J. Phys. D: Appl. Phys.

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The continuous depletion of fossil fuels and the increasing demand for eco-friendly and sustainable energy sources have prompted researchers to look for alternative energy sources. The loss of thermal energy in heat engines (100-350 ºC), coal-based thermal plants (150-700 ºC), heated water pumping in the geothermal process (150-700 ºC), and burning of petrol in the automobiles (150-250 ºC) in form of untapped waste-heat can be directly and/or reversibly converted into usable electricity by means of charge carriers (electrons or holes) as moving fluids using thermoelectric (TE) technology, which works based on typical Seebeck effect. The enhancement in TE conversion efficiency has been a key challenge because of the coupled relation between thermal and electrical transport of charge carriers in a given material. In this review, we have deliberated the physical concepts governing the materials to device performance as well as key challenges for enhancing the TE performance. Moreover, the role of crystal structure in the form of chemical bonding, crystal symmetry, order-disorder and phase transition on charge carrier transport in the material has been explored. Further, this review has also emphasized some insights on various approaches employed recently to improve the TE performance, such as, (i). carrier engineering via band engineering, low dimensional effects, and energy filtering effects and (ii). Phonon engineering via doping/alloying, nano-structuring, embedding secondary phases in the matrix and microstructural engineering. Wehave also briefed the importance of magnetic elements on thermoelectric properties of the selected materials and spin Seebeck effect. Furthermore, the design and fabrication of TE modules and their major challenges are also discussed. As, thermoelectric figure of merit, zT does not have any theoretical limitation, an ideal high performance thermoelectric device should consist of low-cost, eco-friendly, efficient, n- or p-type materials that operate at wide- temperature range and similar coefficients of thermal expansion, suitable contact materials, less electrical/ thermal losses and constant source of thermal energy. Overall, this review provides the recent physical concepts adopted and fabrication procedures of TE materials and device so as to improve the fundamental understanding and to develop a promising TE device.

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Section: Dimensionality Effectsupporting

confidence: 55%

“…The contribution from flattening and the multi-valley effect in band structure led to the S value of ∼360 µVK −1 for AgSb 0.96 Zn 0.04 Te 2 [102]. The temperature dependency of the Seebeck coefficient for non-degenerate semiconductors is represented as below [213]:…”

Section: Dimensionality Effectmentioning

confidence: 99%

Physics and technology of thermoelectric materials and devices

Dadhich

Saminathan

Kumari

et al. 2023

J. Phys. D: Appl. Phys.

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“…4). Clearly, doping and alloying is quite effective strategy for enhancing the materials thermoelectric performance [29][30][31].…”

Section: Thermoelectric Parametersmentioning

confidence: 99%

Thermoelectric performance of Fe2ALV/CNT-based alloys

et al. 2023

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Heusler-type Fe2VxTi 1-xAl alloys offer an alternative solution for the generation of thermoelectric power near room temperature. In the current research, thermoelectric properties of the p-type Fe2V0.9Ti0.1Al and Fe2V0.9Ti0.1Al/CNTs alloys, prepared by SPS, were studied. Carbon nanotubes (CNTs) were used as dopants to improve the Seebeck coefficient and electrical conductivity. Upon doping with CNTs, the thermal conductivity was significantly reduced, meanwhile, the value of the power factor increased from 0.45 to 1.55 mW/mK2 at around 330K. The effect of CNT inclusions on the thermoelectric parameters of Fe2VxTi 1-xAl compounds was systematically studied. When compared to Fe2V0.9Ti0.1Al, which had a figure of merit of just 0.02 at 330 K, the CNT-containing samples showed a significantly improved figure of merit up to 0.07. we offer a novel technique to improve the performance of Fe2VAl alloys.

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“…As reported, devices based on thermoelectric technology can work in reverse mode as a heat pump to produce cooling (refrigeration) with the many advantages including high reliability, small size and no noise, as well. By these measures of performance, thermoelectric technology is highly competitive [10][11][12][13][14].…”

Section: Introductionmentioning

confidence: 99%

Structure, thermal and physic-chemical properties of some chalcogenide alloys

et al. 2023

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Bulk products of crystalline Bi2Se3-xTex alloys (x =0.0, 0.1, 0.3, 0.5) were prepared using simple melting synthesis. Crystalline features, microstructure and surface morphologies of the synthesized samples were examined via x-ray diffraction (XRD), scanning electron microscope (SEM) and energy dispersive x-ray spectrometer. Elemental distribution was studied by energy dispersive analysis of X-ray (EDAX) spectroscopy. Polycrystalline of rhombohedral crystal structure was observed for the concerned samples. Perfect crystallinity and micro-scalability of the prepared were also reflected by the physic-chemical properties of each sample. Thermal behavior was studied throughout differential scanning calorimetry and thermogravimetric analysis showing that the samples are of high stability over high temperature range. Physic-chemical properties were determined in terms of experimental density. These properties were compactness value, molar volume and the percentage of free volume. Density of Bi2Se3 alloy was obtained at 7.37 gm/cm3. Te doping enhanced the density of the Bi2Se3-xTex system. The most Te doped alloy showed density of 9.018 gm/cm3. All other physic-chemical properties showed strong dependence on the Tea amounts in the system.

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Optimized thermoelectric performance in thin (Bi2Se3)1−x(Bi2Te3)x alloyed films

Cited by 21 publications

References 34 publications

Physics and technology of thermoelectric materials and devices

Physics and technology of thermoelectric materials and devices

Thermoelectric performance of Fe2ALV/CNT-based alloys

Structure, thermal and physic-chemical properties of some chalcogenide alloys

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