Electrodeposition of p-Type Sb2Te3 Films and Micro-Pillar Arrays in a Multi-Channel Glass Template

Su, Ning; Guo, Shuai; Fu, Li; Liu, Dawei; Li, Bo

doi:10.3390/ma11071194

Cited by 5 publications

(2 citation statements)

References 52 publications

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“…However, the deposition of p-type Sb 2 Te 3 was limited because that SbO + has poor solubility in acidic solution, which leads to poor crystallization, nonstoichiometry and low density of the sample, and weak TE properties of the pillar. In our work, it is found that the addition of tartaric acid could increase the solubility of SbO + [41]. The composition of deposits can be adjusted by the electrolyte concentration.…”

Section: Resultsmentioning

confidence: 67%

Micro-thermoelectric devices with large output power fabricated on a multi-channel glass template

Su¹,

Guo²,

Li³

et al. 2018

J. Micromech. Microeng.

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Micro-TE (thermoelectric) devices have received increasing attention because of their promising applications as energy resources for micro-systems. However, poor performance and complicated fabrication process has limited their application. This work demonstrates that micro-TEGs (thermoelectric generators) with a large output power of 218 μW and output voltage of 34.7 mV under a larger temperature difference of 98 K can be fabricated using electro-deposition based on the multi-channel glass template, which is much higher than that of other reported work. The micro-TEGs consisted of four pairs of thermocouples. Each thermocouple was composited by about 200 p-type legs of Sb2Te3 and 200 n-type legs of Bi2Te3 60 μm in diameter and 200 μm in height, and were well filled in the glass template by impulse voltage deposition. The length of the TE legs can be adjusted by increasing the length of the channel, which led the large temperature difference and high output power and output voltage. Additionally, the glass template which shows low thermal conductivity and is electrically insulating, can be retained after being filled with TE materials, which simplifies the device fabrication process and also helps to enhance the rigidity of the TE modules. Moreover, this work also reveals that the output voltage can be further improved by increasing the numbers of thermocouples via decreasing the numbers of legs in each thermocouple.

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Section: Resultsmentioning

confidence: 67%

Micro-thermoelectric devices with large output power fabricated on a multi-channel glass template

Su¹,

Guo²,

Li³

et al. 2018

J. Micromech. Microeng.

Self Cite

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show abstract

“…Density function theory (DFT) has been adopted to calculate the lattice constants and electronic structures of BiCuOCh (Ch = Se, S) under strain constraint, which are implemented in the Vienna ab initio Simulation Package (VASP) [23][24][25][26]. The projector augmented wave (PAW) method is chosen with Perdew-Burke-Ernzerhof (PBE) generalized gradient approximation (GGA) exchange-correlation potential [27].…”

Section: Computational Detailsmentioning

confidence: 99%

Uniaxial Tensile Strain Induced the Enhancement of Thermoelectric Properties in n-Type BiCuOCh (Ch = Se, S): A First Principles Study

2020

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It is well known that the performance of thermoelectric measured by figure of merit ZT linearly depends on electrical conductivity, while it is quadratic related to the Seebeck coefficient, and the improvement of Seebeck coefficient may reduce electrical conductivity. As a promising thermoelectric material, BiCuOCh (Ch = Se, S) possesses intrinsically low thermal conductivity, and comparing with its p-type counterpart, n-type BiCuOCh has superior electrical conductivity. Thus, a strategy for increasing Seebeck coefficient while almost maintaining electrical conductivity for enhancing thermoelectric properties of n-type BiCuOCh is highly desired. In this work, the effects of uniaxial tensile strain on the electronic structures and thermoelectric properties of n-type BiCuOCh are examined by using first-principles calculations combined with semiclassical Boltzmann transport theory. The results indicate that the Seebeck coefficient can be enhanced under uniaxial tensile strain, and the reduction of electrical conductivity is negligible. The enhancement is attributed to the increase in the slope of total density of states and the effective mass of electron, accompanied with the conduction band near Fermi level flatter along the Γ to Z direction under strain. Comparing with the unstrained counterpart, the power factor can be improved by 54% for n-type BiCuOSe, and 74% for n-type BiCuOS under a strain of 6% at 800 K with electron concentration 3 × 10 20 cm −3 . Furthermore, the optimal carrier concentrations at different strains are determined. These insights point to an alternative strategy for superior thermoelectric properties.Newly discovered thermoelectric materials BiCuOSe and BiCuOS [BiCuOCh (Ch = Se, S)] have attracted attentions due to their intrinsically low thermal conductivity [8][9][10][11], whose conductive layers (Cu 2 Se 2 ) 2− or (Cu 2 S 2 ) 2− are alternately stacked with an insulating layer (Bi 2 O 2 ) 2+ , composing of the ZrSiCuAs structure type, and this layered structure may be an important factor affording its low thermal conductivity [12,13]. Because of the low lattice thermal conductivity, efforts to improve thermoelectric performance ZT of these compounds have mainly focused on enhancing their power factor S 2 σ. To obtain high power factor, several approaches to increase the electrical conductivity of BiCuOCh, such as doping [14,15], pressure [16], and strain [17], have been attempted. As the electrical conductivity, σ, and Seebeck coefficient, S, are coupled, improving electrical conductivity will reduce Seebeck coefficient [1]. Compared with p-type BiCuOSe, n-type BiCuOSe possesses higher electrical conductivity [16]. On the other hand, it is also noticed that the power factor, S 2 σ, depends linearly on electrical conductivity, σ, but quadratically on Seebeck coefficient S. Thus, it is an alternative pathway to achieve the enhancement of power factor for n-type BiCuOCh via enhancing Seebeck coefficient while keeping electrical conductivity with only slight reduction.Recently, band engineer...

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On the role of water in antimony electrodeposition from choline chloride/ethylene glycol/water mixture

Alcanfor,

da Silva,

de Oliveira

et al. 2024

Journal of Molecular Liquids

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Electrodeposition of p-Type Sb2Te3 Films and Micro-Pillar Arrays in a Multi-Channel Glass Template

Cited by 5 publications

References 52 publications

Micro-thermoelectric devices with large output power fabricated on a multi-channel glass template

Micro-thermoelectric devices with large output power fabricated on a multi-channel glass template

Uniaxial Tensile Strain Induced the Enhancement of Thermoelectric Properties in n-Type BiCuOCh (Ch = Se, S): A First Principles Study

On the role of water in antimony electrodeposition from choline chloride/ethylene glycol/water mixture

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