WO2008020480A1 - matériau de conversion thermoélectrique haute performance et module de conversion thermoélectrique pour production d'énergie - Google Patents

matériau de conversion thermoélectrique haute performance et module de conversion thermoélectrique pour production d'énergie Download PDF

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Publication number
WO2008020480A1
WO2008020480A1 PCT/JP2006/316183 JP2006316183W WO2008020480A1 WO 2008020480 A1 WO2008020480 A1 WO 2008020480A1 JP 2006316183 W JP2006316183 W JP 2006316183W WO 2008020480 A1 WO2008020480 A1 WO 2008020480A1
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thermoelectric
module
thermoelectric conversion
power generation
temperature gradient
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PCT/JP2006/316183
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English (en)
Japanese (ja)
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Osam Yamashita
Hitoshi Arisaka
Hirotaka Odahara
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Materials Science Co., Ltd.
A. M. T Co., Ltd.
Advanced Material Co., Ltd.
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Application filed by Materials Science Co., Ltd., A. M. T Co., Ltd., Advanced Material Co., Ltd. filed Critical Materials Science Co., Ltd.
Priority to PCT/JP2006/316183 priority Critical patent/WO2008020480A1/fr
Publication of WO2008020480A1 publication Critical patent/WO2008020480A1/fr

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    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10N—ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10N10/00—Thermoelectric devices comprising a junction of dissimilar materials, i.e. devices exhibiting Seebeck or Peltier effects
    • H10N10/80—Constructional details
    • H10N10/85—Thermoelectric active materials
    • H10N10/851—Thermoelectric active materials comprising inorganic compositions
    • H10N10/852—Thermoelectric active materials comprising inorganic compositions comprising tellurium, selenium or sulfur
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10N—ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10N10/00—Thermoelectric devices comprising a junction of dissimilar materials, i.e. devices exhibiting Seebeck or Peltier effects
    • H10N10/01—Manufacture or treatment

Definitions

  • thermoelectric conversion materials High performance thermoelectric conversion materials and thermoelectric conversion modules for power generation
  • the present invention relates to a Bi-Te thermoelectric material used for cooling and power generation thermoelectric conversion elements and thermoelectric conversion modules, and relates to a power generation thermoelectric conversion element and a thermoelectric conversion module with significantly improved performance index.
  • thermoelectric conversion modules have already been used for temperature control of electronic coolers, optical communication devices, and measuring devices. If the performance is improved in the future, refrigerators that do not use CFCs and automotive air conditioner products will be used. Is also possible.
  • the thermoelectric conversion module for power generation is a device that is expected to be put to practical use in view of effective utilization of exhaust heat energy, which has been demanded in recent industries. If it is improved in performance, it recovers thermal energy from automobile exhaust gas.
  • Applications for temperature control of fuel reformers for in-vehicle fuel cells are also born. The feature of these devices is that no moving parts are required.
  • Bi-Te-based thermoelectric materials have the ability to produce a crystalline state close to a single crystal using the Bridgman method, the Tyoklalsky method, or the zone melt method. It is produced as a polycrystal using powder metallurgy by pressing.
  • the ingredients include Bi Te as the main material, the force to add Se and Sb, respectively in the form of Bi Se, Sb Te, etc.
  • Patent Document 1 JP 2002-33525 A Disclosure of the invention
  • thermoelectric conversion elements The energy conversion efficiency of thermoelectric conversion elements is very low compared to solar cells (about 12% at the practical level). This is the reason why the applications of thermoelectric conversion modules for power generation and Peltier modules for cooling are narrowed, and the reason why thermoelectric conversion modules are not widespread.
  • An object of the present invention is to provide a method for producing a Bi-Te thermoelectric material with improved performance index and a method for producing a thermoelectric module for power generation.
  • the temperature gradient in the molten metal and ingot is 2 to 20 ° C / cm
  • the molten metal obtained by adding the additive element that determines the polarity of the Bi-Te compound alone or in combination is melted to 0.1 to After manufacturing at a cooling rate of 5.0 ° C / min, it was found that a thermoelectric material having a high figure of merit and a polycrystalline material can be obtained by heat treatment at a temperature of 250 ° C to 350 ° C.
  • An ingot of a Bi-Te thermoelectric material is prepared by melting a thermoelectric conversion material in a quartz tube by vacuum sealing or argon sealing, and then setting the temperature gradient in the molten metal and ingot to 2 to 20 ° C / cm, and The molten metal in a quartz tube is cooled at a cooling rate of 0.1 to 5.0 ° C / min.
  • Bi Te materials have Van der Waals bonds between the c-planes of crystals. surface
  • thermoelectric material of the present invention is not stipulated, if the crystal grain size and crystal orientation are such that the mechanical strength of the thermoelectric conversion material is a concern, the void portion of the assembled module It can be strengthened rather than a normal thermoelectric conversion element by pouring and hardening an insulating resin with extremely low thermal conductivity.
  • thermoelectric conversion material of the present invention is mainly composed of BiTe or Sb2Te, and is particularly a P-type semiconductor.
  • the additive element contains at least one group 4 element, group 6 element, or group 7 element at 12 wt.% Or less, and in the case of an N-type semiconductor, the additive element is group 6 It may contain 0.10 wt.% Or less of at least one of elements, group 7 elements, and halogenated substances.
  • thermoelectric module for power generation
  • the inventors are most effective to improve the Seebeck coefficient of the conversion element and the thermoelectric module at the same time as using a high-performance thermoelectric material. It is. Recently, Balmush et al. Reported that in a PN-bonded semiconductor, when a temperature gradient in the vertical direction is applied to the bonding surface, the thermoelectromotive force increases greatly due to a rapid temperature gradient near the bonding interface. Reference 1).
  • Non-Patent Document 1 1 ⁇ Balmushet al, Semiconductors 29 (1995) 937
  • the inventors have determined the length of the Bi-Te thermoelectric material and the metal and the temperature gradient applied to the Bi-Te thermoelectric conversion element. As a result of various investigations on the application method, it was found that a high-performance thermoelectric conversion element or module for power generation can be obtained.
  • the manufacturing method for these high-performance power generation modules (Fig. 2) is characterized by alternately connecting P-type and N-type thermoelectric elements in series.
  • the power generation module of the present invention uses an increase in the Zeck coefficient due to a rapid temperature gradient at the interface, and therefore, even if it is converted to a Peltier module for cooling, energy conversion is performed. It ’s better to improve efficiency!
  • the Bi-Te-based thermoelectric conversion material of the present invention has Bi Te as a main material and is a P-type semiconductor.
  • the performance index at room temperature greatly exceeds 1 by containing 1 type, the temperature gradient in the molten metal and ingot is 2-20 ° C / cm, and the cooling rate is 0.1-5.0 ° C / min. be able to. Further, the figure of merit can be further improved by heat treatment.
  • the figure of merit of the n-type thermoelectric conversion element reached 23.1 using the measurement method shown in Fig. 3. This is about 30 times that of conventional BKTe thermoelectric elements.
  • the method for measuring energy conversion efficiency is the same as in Fig. 3 in principle. This conversion efficiency is lower than the 12% energy conversion efficiency at the practical level of solar cells, but if the temperature difference is further increased, it is considered that the conversion efficiency of solar cells will be sufficiently exceeded.
  • the module of the present invention is also a power generation module characterized by applying a periodically changing temperature gradient.
  • thermoelectric material is based on Bi Te having a rhombohedral crystal structure.
  • Thermoelectric module for high-performance power generation a part of the B source element is replaced with a group 5 element, or a part of the Te atom is replaced with a group 6 element.
  • the present invention relates to Bi Te-based thermoelectric materials to which elements are added individually or in combination. Thermoelectric module for high-performance power generation
  • thermoelectric module by assembling a thermoelectric module using a thermoelectric conversion element in which the ratio of the length of the thermoelectric material to the total length of the thermoelectric conversion element is a predetermined ratio, the Seebeck coefficient S is reduced due to the interface effect between the metal and the thermoelectric material. It has been found that the performance index of thermoelectric elements and the power generation efficiency of thermoelectric modules can be greatly improved. The present invention has been made based on these findings, and the embodiments thereof will be described in detail below.
  • Bi Te-based thermoelectric materials originally show P-type thermoelectric properties, but Bi Te is a hole carrier.
  • the figure of merit is increased by adding a group 6 chalcogen element that emits electrons when entering the crystal so as to reduce the carrier concentration of holes.
  • a group 6 chalcogen element, a group 7 halogen element, or a metal element halide is added to change the polarity to negative, and at the same time, the addition The figure of merit is improved by adjusting the carrier concentration.
  • the amount of additive elements and additives added to the Bi Te-based thermoelectric material depends on the desired polarity and carrier.
  • the electrical resistivity may increase due to impurity effects, so it is preferable to be less than 15 wt.%, Particularly preferably 3 to 12 wt.%. When adding in combination, it is desirable to add 3 to 13 wt.
  • N type requires at least one additive of 0.01 wt.% Or more, and if it exceeds O.lOwt.%, The electrical resistivity may increase due to the impurity effect. It is preferable that it is wt.% or less. When adding in combination, it is desirable to add 0.09 to 0.20 wt.% In total amount! /.
  • the additive element is Si, Ge, Sn, Pb as the Group 4 element, S, Se, Te as the Group 6 element, Br, I as the Group 7 element, and when the complex addition is preferable It is also possible to use compounds of these various elements or compounds with the main component elements.
  • the temperature gradient in the molten metal and ingot exceeds 20 ° C / cm, the electrical resistivity and thermal conductivity increase and the figure of merit decreases, but the temperature gradient force 3 ⁇ 4 ° C / cm If it is less than 1, the electrical resistivity will increase significantly tl and the figure of merit will decrease as well. Therefore, the temperature gradient in the molten metal and ingot is preferably 2 to 20 ° C / cm.
  • thermoelectric material is polycrystalline, and the X-ray diffraction intensity ratio 1 (006) / 1 (105) of (006) and (105) reflection measured on a plane perpendicular to the direction of the temperature gradient is 2 ⁇ 15% is preferred.
  • this thermoelectric conversion material uses a component in the c-axis direction that has a very low thermal conductivity, it can be expected that the thermal conductivity of the entire material will be significantly reduced, so that the figure of merit can be greatly improved. .
  • Melting power As a method for producing a polycrystalline ingot, it may be produced by a deviation method such as Bridgman method or zone melt method. Ingots produced at high speed and crystal growth rate, the additive elements and additives are considerably dispersed in the crystal grains. The material segregates or precipitates at the grain boundaries. When the additive element is appropriately dispersed in the crystal grains, the thermal conductivity due to phonon is decreased, and at the same time, the additive element force S ion is released and the carrier is released, so that the electrical resistivity tends to decrease. However, when the additive element is segregated, the opposite tendency is exhibited. Therefore, the electrical resistivity and thermal conductivity are greatly influenced by the crystal growth rate. Therefore, the crystal growth rate is controlled so that the additive calo element is in an appropriate dispersed state in the crystal grains, and the heat treatment is performed. By doing so, the increase in electrical resistivity and thermal conductivity can be significantly suppressed.
  • a deviation method such as Bridgman method or zone melt method.
  • the cooling start temperature of the ingot is any number of times as long as the Bi Te compound is dissolved.
  • the atmosphere in the molten metal is preferably a vacuum or an inert gas.
  • the thermoelectric ingot is about twice as high as the performance index of the conventional Bi-Te thermoelectric material, it should have excellent cooling characteristics even if it is designed with the same material thickness configuration (x> 0.8) as a normal module. A Lucier module is obtained. This excellent figure of merit can also be used for small air conditioners and small refrigerators, leading to the production of home appliances that do not use refrigerant gas.
  • ZT 0.7-0.8
  • thermoelectric conversion element is produced by bonding a metal to a Bi-Te sintered body sample produced by powder metallurgy, which is not a phenomenon peculiar to the high-performance material of the present invention.
  • thermoelectric element in which a Si-Ge alloy is bonded to a metal by silver brazing is used.
  • thermoelectric material can be joined by sandwiching the thermoelectric material and metal at a predetermined ratio. It can be seen that the energy conversion efficiency is improved.
  • figure of merit of S-to-Ge alloy tends to increase with increasing temperature, so it should improve to more than twice the current figure of merit at around 500 ° C.
  • the power generation module of the present invention has a property that the figure of merit is remarkably improved when the length of the thermoelectric material and the metal has a predetermined length at a predetermined ratio. This is due to a dramatic increase in the Seebeck coefficient due to a decrease in the electrical resistance of the thermoelectric material and a large interfacial effect within the thermoelectric material. Therefore, the power generation module of the present invention is completely different from the material composition ratio of the conventional module, and even if the thickness of the module is reduced, a higher energy conversion efficiency can be obtained than the module of the conventional configuration, so there is an advantage that it can be made lighter, thinner and smaller .
  • thermoelectric module for power generation, after assembling the P-type and N-type thermoelectric elements into the module so that the ratio of the length of the thermoelectric material to the metal is a predetermined ratio, the module voids
  • the module voids We propose a method of pouring high-insulating liquid resin into the part and drying and solidifying the resin to integrate it.
  • the sealing performance of the module is improved, which also improves the vibration resistance, durability, corrosion resistance, and waterproofness of the module, ensuring high reliability for in-vehicle use.
  • a mixture of epoxy resin and a curing agent is suitable as the resin used.
  • the thickness of the alumina plate installed outside the module can be reduced, so that the thermal resistance between the heat source and the thermoelectric element can be reduced, and the heat source power can also be reduced. It is possible to facilitate the inflow of heat. This will also lead to the miniaturization of modules.
  • the energy conversion efficiency of the power generation module is the periodic temperature applied to the module. Since it varies depending on the gradient period, it is necessary to optimize the period of the applied temperature gradient. Naturally, the optimal period varies depending on the module size, heat capacity, heat source heat capacity, etc., so it must be determined according to the environment in which the module is installed.
  • the power generation module of the present invention has a low electrical resistance of about 1/100 that of a conventional thermoelectric module, and therefore has a feature of generating output power with a low voltage and a large current. Therefore, when the direction of the temperature gradient is constant, it is necessary to convert the output to a high voltage and low current that can be easily used with a DC / DC or DC / AC converter, depending on the application. In addition, when used under a temperature gradient that changes periodically, it is necessary to convert the voltage / current to an AC / DC or AC / AC comparator according to the application.
  • thermoelectromotive force by applying a periodic temperature gradient is due to a dramatic increase in the Seebeck coefficient due to the sudden temperature gradient in the thermoelectric material near the interface between the metal and the thermoelectric material.
  • the thermal conductivity of the thermoelectric material is extremely low, the heat flow from a metal with extremely high thermal conductivity does not flow instantaneously into the thermoelectric material, and the heat flow does not reach the inside of the thermoelectric material. Heat is stored only in the surface layer of the material, and it is also a force that creates a sudden temperature gradient.
  • the dramatic increase in the Seebeck coefficient is thought to be caused by the synergistic effect of the metal heat sink effect and the interfacial effect.
  • thermoelectric conversion material B has a high Seebeck coefficient and a low heat conductivity, And each constituent material is predetermined 1 1
  • the figure of merit of the device increases most when it has B and.
  • thermoelectric conversion element in which a thermoelectric material is sandwiched between metals
  • the constituent atoms of the thermoelectric material, metal, and solder material must be prevented from interdiffusion at the interface.
  • the thermal conductivity of the thermoelectric material increases and the interface This is because the temperature gradient in a nearby thermoelectric material is remarkably lowered to decrease the increase rate of the Seebeck coefficient, or the thermal conductivity of the metal is lowered to deteriorate the function of the metal as a heat pipe.
  • the metal preferably has a low electrical resistivity and a high thermal conductivity.
  • the metal used since the metal used must be a material with excellent corrosion resistance, a single metal or alloy of noble metals such as Cu, Ag and Au is preferred.
  • thermoelectric element Conventional power generation modules using the Seebeck effect have been used under conditions where the direction of the temperature gradient is constant. This is because the positions of the heat source and the cold source are determined. However, as shown in Fig. 4, the direction of the voltage applied to two Peltier modules electrically connected in series is periodically changed, and the direction of the temperature gradient applied to the thermoelectric element is changed periodically. It has been found by the present invention that the energy conversion efficiency to thermoelectricity is dramatically increased.
  • thermoelectric material When the length of the thermoelectric material is less than one-third of the length of the metal material, an appropriate periodic temperature gradient is applied to the module so that the output power of the module is constant when the direction of the temperature gradient is constant. Compared to, improved 2.3 times. In reality, there are almost no heat sources that alternate between the high temperature side and the low temperature side, but it is possible to create it.
  • the power generation module is rotated at a certain period, and the module is heated with a heat pipe from a high-temperature heat source.
  • a temperature gradient that changes periodically even with a fixed heat source force can be easily applied to the module. Since the time interval for switching between the high and low temperature heat sources exceeds 1 minute, there is sufficient time to rotate the module, and there is little electric energy required to move, so it can be put to practical use.
  • thermoelectric material and the metal When joining the thermoelectric material and the metal, if the joining metal does not dissolve or react with the thermoelectric material or metal, the solder that is joined after soldering or the Bi or Bi-Sb alloy is melted. It may be used as a bonding material. If the thickness of the plating or the bonding material is reduced, there is no significant effect on the characteristics by either method.
  • thermoelectric material examples of the thermoelectric material and the manufacturing method thereof according to the present invention will be described.
  • various arrangements of the main components and additive elements used were used.
  • Table 1 shows the results. In this way, after mixing elements and compounds at a predetermined ratio, they are vacuum-sealed or argon-filled in a 12 ⁇ quartz tube and melted at high frequency (purity of raw materials used is 99.9 9% or more). After melting, an ingot was prepared by changing the cooling rate and the temperature gradient of the sample part. A thermoelectric property was measured by cutting a sample for measurement at the center of the cylindrical ingot. The processing dimensions for measuring electrical resistivity and Seebeck coefficient were 5 x 5 x 15 mm 3 and the measurements were taken along the length of 15 mm. The thermal conductivity was measured by cutting out a 5 mm x 5 mm x 1 mm square with a thickness of 1 mm from the center of the sample where the electrical resistivity was measured.
  • thermoelectric properties and crystal orientation ratio of 1 (0 06) / 1 (105)
  • a vacuum was placed in a 12 ⁇ quartz tube. After encapsulating or argon sealing and high frequency melting, ingots were made with various cooling rates and temperature gradients.
  • the composition of the material used is p-type No. 2 in Table 1 and n-type No. 5 in Table 1.
  • the processing dimensions for measuring electrical resistivity and Seebeck coefficient were 5 x 5 x 15 mm 3 and the measurements were taken along the length direction of 15 mm.
  • X-ray diffraction and thermal conductivity measurements were made by cutting a 5 mm x 5 mm x 3 mm square from the center of the sample where the electrical resistivity was measured.
  • Table 4 shows the preparation conditions of these samples, and Table 5 shows the measurement results of thermoelectric characteristics.
  • the pass / fail criteria for the performance index is 1.10, and the higher is the total.
  • the p-type was kept for sample No. 7 in Table 3 and the n-type was kept for No. 15 in Table 3 in vacuum at various heat treatment temperatures for 2 hours. The characteristics were measured.
  • the processing dimensions for measuring electrical resistivity and Seebeck coefficient were 5 x 5 x 15 mm 3 and the measurements were taken along the length direction of 15 mm.
  • the thermal conductivity is measured by measuring the electrical resistivity.
  • the sample was cut from a central portion of the sample with a lmm-thick square 5 x 5 x 1 mm 3 cut.
  • Table 6 shows the fabrication conditions of these samples and the measurement results of thermoelectric properties.
  • the acceptance criteria for the heat treatment effect were the heat treatment conditions in which the figure of merit was improved by the heat treatment.
  • thermoelectric conversion element was cut into a 5 mm X 5 mm shape and then cut into lengths shown in Table 7.
  • Cu and Ag used as electrodes were also processed to the length shown in the table. After plating Ni on both ends of the thermoelectric material, Cu and Ag were joined with eutectic solder to produce P-type and N-type thermoelectric elements as shown in Fig. 1.
  • Table 7 shows the results of measuring the thermoelectric characteristics of the manufactured P-type and N-type thermoelectric conversion elements at 25 ° C.
  • the pass / fail criterion for the figure of merit ZT of the thermoelectric conversion element was set to 3, and the above was set as the total.
  • thermoelectric conversion element After measuring the electrical resistance R of a pair of modules fabricated as shown in Fig. 2 by ⁇ -bonding the P-type and N-type thermoelectric conversion elements shown in Table 7, as shown in Fig. 3, By applying a current to the Peltier module connected in series, a temperature gradient is applied to the thermoelectric conversion element, the effective thermoelectromotive force ⁇ is measured, and the output power AW and energy conversion efficiency are calculated.
  • Table 8 shows. In the current measurement, all of the input power to the Peltier modules connected in series is not flowing into the module to be measured but flowing out, so that these energy conversion efficiencies are actually It is thought that it is estimated smaller than.
  • Input power of the Peltier module Win is the electric resistance of the Peltier module r (0.55
  • the pass / fail criterion for in was 2.5%, and more than that.
  • Example 5 The main composition of the Si-Ge alloy thermoelectric material is Si Ge. As an additive, p-type has 0.3% B.
  • n-type 0.4 at.% P was added and melted by the arc melting method, then cut into a 5 mm ⁇ 5 mm shape and cut to the length shown in Table 7.
  • the Cu used as the electrode was also processed to the length shown in the table.
  • Thermoelectric materials and Cu were joined with silver brazing to produce P-type and N-type thermoelectric conversion elements as shown in Fig. 1.
  • Table 9 shows the results of measuring the thermoelectric properties of the manufactured P-type and N-type thermoelectric conversion elements at 25 ° C.
  • the pass / fail criterion for the figure of merit ZT of the thermoelectric conversion element was 0.10, and more than that.
  • thermoelectric conversion element After measuring the electrical resistance R of a pair of modules fabricated as shown in Fig. 2 by ⁇ -bonding the P-type and N-type thermoelectric conversion elements shown in Table 9 and then electrically as shown in Fig. 3 By applying a current to a Peltier module connected in series, a temperature gradient is applied to the thermoelectric conversion element, the effective thermoelectromotive force ⁇ is measured, and the output power AW and energy conversion efficiency are calculated as eff
  • the input power of the Peltier module Win is the electric resistance of the Peltier module r (0.55
  • the acceptance criteria for the module energy conversion efficiency ⁇ W / Win was 0.10%, and more than that.
  • thermoelectric module When a module is manufactured by a conventional design method using a high-performance Bi-Te thermoelectric material according to the present invention, a Peltier module having excellent cooling characteristics can be manufactured. Also, by assembling a thermoelectric module with a predetermined ratio of the length of the metal and the thermoelectric material, the Seebeck coefficient S is dramatically increased by the heat sink effect of the metal with good heat conduction and the interface effect between the metal and the thermoelectric material. Increases and greatly improves the figure of merit, making it possible to produce superior power generation modules.
  • FIG. 1 is a perspective explanatory view showing a configuration of a thermoelectric conversion element.
  • FIG. 2 is a schematic view of a thermoelectric module with pn junction.
  • FIG. 3 A measuring method of a thermoelectric conversion element.
  • FIG. 4 is a voltage and time graph showing a method of applying voltage to the thermoelectric conversion element and module.
  • FIG. 5 is an explanatory perspective view showing a method of applying a temperature gradient that changes periodically.

Abstract

La présente invention porte sur un matériau thermoélectrique, dont l'efficacité a été accrue, et un module thermoélectrique pour production d'énergie. L'indice d'efficacité d'un matériau thermoélectrique à base Bi-Te obtenu en fournissant Bi2Te3 comme matériau principal, en faisant fondre le matériau principal sous vide ou bien dans une atmosphère de gaz inerte et en refroidissant le produit de fusion dans des conditions d'un gradient de température dans le métal et le lingot en fusion de 2 à 20°C/cm et d'un débit de refroidissement de 0,1 à 5°C/min ou moins atteint environ 1,4 à la température ambiante. L'indice d'efficacité de l'élément thermoélectrique est accru de manière significative en plaquant un matériau thermoélectrique sur sa surface venant au contact d'une source de chaleur, brasant la surface à un métal pour obtenir un ensemble, et amenant le rapport entre la longueur lB du matériau thermoélectrique et la longueur globale l de l'élément de conversion thermoélectrique (x=lB/l) à une valeur comprise entre 0,010 et 0,333. Spécifiquement, lorsque x est inférieur ou égal à 0,200 l'indice d'efficacité dépasse 4. En particulier, lorsque x est égal à 0,032 (lB = 0,10 mm, l = 3,10 mm), lorsque la direction du gradient de température est fixée, l'efficacité de conversion d'énergie atteint 5,3% à une différence de température ΔT de 7,4 K. De plus, avec un gradient de température changé périodiquement à une période T de 240 sec, l'efficacité de conversion d'énergie est portée à 14,3%.
PCT/JP2006/316183 2006-08-17 2006-08-17 matériau de conversion thermoélectrique haute performance et module de conversion thermoélectrique pour production d'énergie WO2008020480A1 (fr)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2014069045A1 (fr) * 2012-10-31 2014-05-08 ダイハツ工業株式会社 Système de production d'électricité
US9190597B2 (en) 2010-04-28 2015-11-17 Daihatsu Motor Co., Ltd. Power-generating system
JP2018516457A (ja) * 2015-04-14 2018-06-21 エルジー エレクトロニクス インコーポレイティド 熱電素材及びこれを含む熱電素子と熱電モジュール

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Publication number Priority date Publication date Assignee Title
JPH10290030A (ja) * 1997-04-14 1998-10-27 Orion Mach Co Ltd 半導体素子の製造方法、製造装置および熱電変換モジュールの製造方法

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Publication number Priority date Publication date Assignee Title
JPH10290030A (ja) * 1997-04-14 1998-10-27 Orion Mach Co Ltd 半導体素子の製造方法、製造装置および熱電変換モジュールの製造方法

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9190597B2 (en) 2010-04-28 2015-11-17 Daihatsu Motor Co., Ltd. Power-generating system
WO2014069045A1 (fr) * 2012-10-31 2014-05-08 ダイハツ工業株式会社 Système de production d'électricité
US9979325B2 (en) 2012-10-31 2018-05-22 Daihatsu Motor Co., Ltd. Pyroelectric power-generating system
JP2018516457A (ja) * 2015-04-14 2018-06-21 エルジー エレクトロニクス インコーポレイティド 熱電素材及びこれを含む熱電素子と熱電モジュール
US10600947B2 (en) 2015-04-14 2020-03-24 Lg Electronics Inc. Thermoelectric materials, and thermoelectric element and thermoelectric module comprising the same

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