• Title, Summary, Keyword: Thermoelectric properties

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Characteristics of electric power for thermoelectric cooling & generating module (열전냉각소자와 열전발전소자의 발전특성)

  • 우병철;이희웅;이동윤
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • pp.448-451
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    • 2000
  • The purpose of this study is to manufacture and test a thermoelectric generator which converts unused energy from close-at-hand sources, such as garbage incineration heat and industrial exhaust, to electricity. A manufacturing process and the properties of a thermoelectric generator are discussed before simulating the thermal stress and thermal properties of a thermoelectric module located between an aluminum tube and alumina plate. We can design the thermoelectric modules having the good properties of thermoelectric generation. Resistivity of thermoelectric module for thermoelectric generation consisting of 62 cells was 0.15-0.4$\Omega$ Developed thermoelectric modules can be expected th have better properties than thermoelectric cooling modules above $70^{\circ}C$ in temperature difference between hot and cold ends.

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Organic-Inorganic Hybrid Thermoelectric Material Synthesis and Properties

  • Kim, Jiwon;Lim, Jae-Hong
    • Journal of the Korean Ceramic Society
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    • v.54 no.4
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    • pp.272-277
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    • 2017
  • Organic-inorganic hybrid thermoelectric materials have obtained increasing attention because it opens the possibility of enhancing thermoelectric performance by utilizing the low thermal conductivity of organic thermoelectric materials and the high Seebeck coefficient of inorganic thermoelectric materials. Moreover, the organic-inorganic hybrid thermoelectric materials possess numerous advantages, including functional aspects such as flexibility or transparency, low cost raw materials, and simplified fabrication processes, thus, allowing for a wide range of potential applications. In this study, the types and synthesis methods of organic-inorganic thermoelectric hybrid materials were discussed along with the methods used to enhance their thermoelectric properties. As a key factor to maximize the thermoelectric performances of hybrid thermoelectric materials, the nanoengineering to control the nanostructure of the inorganic materials as well as the modification of the organic material structure and doping level are considered, respectively. Meanwhile, the interface between the inorganic and organic phase is also important to develop the hybrid thermoelectric module with excellent reliability and high thermoelectric efficiency in addition to its performance in various electronic devices.

Computational Simulations of Thermoelectric Transport Properties

  • Ryu, Byungki;Oh, Min-Wook
    • Journal of the Korean Ceramic Society
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    • v.53 no.3
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    • pp.273-281
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    • 2016
  • This review examines computational simulations of thermoelectric properties, such as electrical conductivity, Seebeck coefficient, and thermal conductivity. With increasing computing power and the development of several efficient simulation codes for electronic structure and transport properties calculations, we can evaluate all the thermoelectric properties within the first-principles calculations with the relaxation time approximation. This review presents the basic principles of electrical and thermal transport equations and how they evaluate properties from the first-principles calculations. As a model case, this review presents results on $Bi_2Te_3$ and Si. Even though there is still an unsolved parameter such as the relaxation time, the effectiveness of the computational simulations on the transport properties will provide much help to experimental scientist researching novel thermoelectric materials.

Characteristics of electric power for thermoelectric generator with tube thickness (열전관의 두께변화에 따른 열전발전기의 발전 특성)

  • Woo, B.C.;Lee, H.W.;Lee, D.Y.;Kim, I.J.
    • Proceedings of the KIEE Conference
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    • pp.1319-1321
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    • 2001
  • The purpose of this study is to manufacture and test a thermoelectric generator which converts unused energy from close-at-hand sources, such as garbage incineration heat and industrial exhaust, to electricity. A manufacturing process and the properties of a thermoelectric generator are discussed before simulation the thermal stress and thermal properties of a thermoelectric module located between an aluminum tube and alumina plate. We can design the thermoelectric modules having the good properties of thermoelectric generation. Resistivity of thermoelectric module for thermoelectric generation consisting of 62 cells was $0.15{\sim}0.4{\Omega}$. The maximum power of thermoelectric generator using thermoelectric generation modules can be defined as temperature function, and in this case. It can be analogized the lineal relation between current and voltage characteristics as function of temperature. The thermoelectric generator using 32 thermoelectric modules was assembled with 32 directly connected modules that they constrained for two kinds of heat transfer tube with key joints.

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Characteristics of electric power for thermoelectric generating module (열전발전용 소자를 이용한 열전발전기의 발전 특성)

  • Woo, B.C.;Lee, H.W.;Lee, D.Y.;Kim, B.S.;Kim, B.G.
    • Proceedings of the KIEE Conference
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    • pp.1614-1616
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    • 2000
  • The purpose of this study is to manufacture and test a thermoelectric generator which converts unused energy from close-at-hand sources, such as garbage incineration heat and industrial exhaust, to electricity. A manufacturing process and the properties of a thermoelectric generator are discussed before simulating the thermal stress and thermal properties of a thermoelectric module located between an aluminum tube and alumina plate. We can design the thermoelectric modules having the good properties of thermoelectric generation. Resistivity of thermoelectric module for thermoelectric generation consisting of 62 cells was $0.15{\sim}0.4{\Omega}$. The maximum power of thermoelectric generator using thermoelectric generating modules can be defined as temperature function, and in this case it can be analogized the linear relation between current and voltage characteristics as function of temperature. The thermoelectric generator using 128 generating modules was assembled with 4 parallel connected modules sets composed with 32 directly connected modules.

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Improvement of Thermoelectric Properties of Bismuth Telluride Thin Films using Rapid Thermal Processing (Bismuth Telluride 박막의 열전특성 개선을 위한 급속 열처리효과)

  • Kim, Dong-Ho;Lee, Gun-Hwan
    • Korean Journal of Materials Research
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    • v.16 no.5
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    • pp.292-296
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    • 2006
  • Effects of rapid thermal annealing of bismuth telluride thin films on their thermoelectric properties were investigated. Films with four different compositions were elaborated by co-sputtering of Bi and Te targets. Rapid thermal treatments in range of $300{\sim}400^{\circ}C$ were carried out during 10 minutes under the reducing atmosphere (Ar with 10% $H_2$). As the temperature of thermal treatment increased, carrier concentrations of films decreased while their mobilities increased. These changes were clearly observed for the films close to the stoichiometric composition. Rapid thermal treatment was found to be effective in improving the thermoelectric properties of $Bi_2Te_3$ films. Recrystallization of $Bi_2Te_3$ phase has caused the enhancement of thermoelectric properties, along with the decrease of the carrier concentration. Maximum values of Seebeck coefficient and power factor were obtained for the films treated at $400^{\circ}C$ (about $-128{\mu}V/K$ and $9{\times}10^{-4}\;W/K^2m$, respectively). With further higher temperature ($500^{\circ}C$), thermoelectric properties deteriorated due to the evaporation of Te element and subsequent disruption of film's structure.

Thermoelectric Properties of Half-Heusler ZrNiSn1-xSbx Synthesized by Mechanical Alloying Process and Vacuum Hot Pressing

  • Ur, Soon-Chul
    • Journal of Korean Powder Metallurgy Institute
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    • v.18 no.5
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    • pp.401-405
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    • 2011
  • Half-heusler phase ZrNiSn is one of the potential thermoelectric materials for high temperature application. In an attempt to investigate the effect of Sb doping on thermoelectric properties, half-heusler phase $ZrNiSn_{1-x}Sb_x$ ($0{\leq}x{\leq}0.08$) was synthesized by mechanical alloying of stoichiometric elemental powder compositions, and consolidated by vacuum hot pressing. Phase transformations during mechanical alloying and hot consolidation were investigated using XRD. Sb doped ZrNiSn was successfully produced in all doping ranges by vacuum hot pressing using as-milled powders without subsequent annealing. Thermoelectric properties as functions of temperature and Sb contents were evaluated for the hot pressed specimens. Sb doping up to x=0.04 in $ZrNiSn_{1-x}Sb_x$ was shown to be effective on thermoelectric properties and the figure of merit (ZT) was shown to reach to the maximum at x=0.02 in this study.

Thermoelectric Properties of Rapid Solidified p-type Bi2Te3 Alloy Fabricated by Spark Plasma Sintering(SPS) Process (방전 플라즈마 소결법(SPS)으로 제조된 급속응고 p-type Bi2Te3 합금의 소결 특성)

  • Moon, Chul-Dong;Hong, Soon-Jik;Kim, Do-Hyang;Kim, Taek-Soo
    • Journal of Korean Powder Metallurgy Institute
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    • v.17 no.6
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    • pp.494-498
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    • 2010
  • The p-type thermoelectric compounds of $Bi_2Te_3$ based doped with 3wt% Te were fabricated by a combination of rapid solidification and spark plasma sintering (SPS) process. The effect of holding time during spark plasma sintering (SPS) on the microstructure and thermoelectric properties were investigated using scanning electron microscope (SEM), X-ray diffraction (XRD) and thermoelectric properties. The powders as solidified consisted of homogeneous thermoelectric phases. The thermoelectric figure of merit measured to be maximum ($3.41{\times}10^{-3}/K$) at the SPS temperature of $430^{\circ}C$.

Thermoelectric Properties of Fe-doped $CoSb_3$ Prepared by Encapsulated Induction Melting and Hot Pressing

  • Park, Kwan-Ho;Kim, Mi-Jung;Jung, Jae-Yong;You, Sin-Wook;Lee, Jung-Il;Ur, Soon-Chul;Kim, Il-Ho
    • Proceedings of the Korean Powder Metallurgy Institute Conference
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    • pp.686-687
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    • 2006
  • The encapsulated induction melting and hot pressing were employed to prepare Fe-doped $CoSb_3$ skutterudites and their thermoelectric properties were investigated. Single phase $\delta-CoSb_3$ was successfully obtained by the subsequent heat treatment at 773K for 24 hours. Iron atoms acted as electron acceptors by substituting cobalt atoms. Thermoelectric properties were remarkably improved by the appropriate doping. $Co_{0.7}Fe_{0.3}Sb_3$ was found as an optimum composition for best thermoelectric properties in this work.

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Thermoelectric Properties of $Bi_2Te_3$, $Sb_2Te_3$ by varying annealing temperature (Thermopile, 펠티어소자에 적용할 $Bi_2Te_3$, $Sb_2Te_3$의 annealing 온도변화에 따른 박막특성 분석)

  • Kim, Hyeon-Sik;Cho, Yeon-Shik;Park, Hyo-Derk;Seo, Dae-Sik
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • pp.212-212
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    • 2009
  • Thermoelectric devices were used to wide range of application. At present, increasing the efficiency of these devices, in particular, through the preparation of materials showing a high thermoelectric figure of merit, Z, $Bi_2Te_3$ and $Sb_2Te_3$ thin films on Si substrates are deposited by flash evaporation method for thermopile sensor applications. In order to enhance the thermoelectric properties of the thin film, annealing in high vacuum is carried out in the temperature range from 200 to $350^{\circ}C$. The microstructure of the film is investigated by XRD and SEM. The resistivity and Seebeck coefficient of the films are measured by Van der Pauw method and hot probe method respectively. At elevating annealing temperature, the crystallinity and thermoelectrical properties of films are improved by increasing the size of grains. At excessive high annealing temperatures, it is shown that Seebeck coefficient of films is decreased because of Te evaporation. By optimizing the annealing conditions, it is possible to obtain a high performance thin film with a thermoelectric properties.

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