WO2015046810A1 - 신규한 화합물 반도체 및 그 활용 - Google Patents
신규한 화합물 반도체 및 그 활용 Download PDFInfo
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- WO2015046810A1 WO2015046810A1 PCT/KR2014/008705 KR2014008705W WO2015046810A1 WO 2015046810 A1 WO2015046810 A1 WO 2015046810A1 KR 2014008705 W KR2014008705 W KR 2014008705W WO 2015046810 A1 WO2015046810 A1 WO 2015046810A1
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- 150000001875 compounds Chemical class 0.000 title claims abstract description 98
- 239000004065 semiconductor Substances 0.000 title claims abstract description 97
- 239000000463 material Substances 0.000 claims abstract description 37
- 239000000126 substance Substances 0.000 claims abstract description 15
- 229910052802 copper Inorganic materials 0.000 claims abstract description 8
- 229910052742 iron Inorganic materials 0.000 claims abstract description 7
- 229910052759 nickel Inorganic materials 0.000 claims abstract description 7
- 229910052709 silver Inorganic materials 0.000 claims abstract description 7
- 238000006243 chemical reaction Methods 0.000 claims description 58
- 239000000203 mixture Substances 0.000 claims description 48
- 238000000034 method Methods 0.000 claims description 38
- 238000005245 sintering Methods 0.000 claims description 19
- 229910052797 bismuth Inorganic materials 0.000 claims description 15
- 238000004519 manufacturing process Methods 0.000 claims description 14
- 238000010438 heat treatment Methods 0.000 claims description 12
- 238000003746 solid phase reaction Methods 0.000 claims description 7
- 239000000843 powder Substances 0.000 description 14
- 230000000052 comparative effect Effects 0.000 description 12
- 238000002490 spark plasma sintering Methods 0.000 description 10
- 239000003708 ampul Substances 0.000 description 8
- 239000002994 raw material Substances 0.000 description 7
- 239000000872 buffer Substances 0.000 description 5
- 239000000523 sample Substances 0.000 description 5
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 4
- 239000003153 chemical reaction reagent Substances 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 239000010453 quartz Substances 0.000 description 4
- 229910052710 silicon Inorganic materials 0.000 description 4
- 239000010703 silicon Substances 0.000 description 4
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 4
- 238000001816 cooling Methods 0.000 description 3
- 230000031700 light absorption Effects 0.000 description 3
- 238000002156 mixing Methods 0.000 description 3
- 238000010248 power generation Methods 0.000 description 3
- 238000010671 solid-state reaction Methods 0.000 description 3
- 238000000224 chemical solution deposition Methods 0.000 description 2
- 238000000151 deposition Methods 0.000 description 2
- 229910052738 indium Inorganic materials 0.000 description 2
- 238000002844 melting Methods 0.000 description 2
- 230000008018 melting Effects 0.000 description 2
- 238000003801 milling Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000005453 pelletization Methods 0.000 description 2
- 238000004549 pulsed laser deposition Methods 0.000 description 2
- 239000000758 substrate Substances 0.000 description 2
- 229940126062 Compound A Drugs 0.000 description 1
- NLDMNSXOCDLTTB-UHFFFAOYSA-N Heterophylliin A Natural products O1C2COC(=O)C3=CC(O)=C(O)C(O)=C3C3=C(O)C(O)=C(O)C=C3C(=O)OC2C(OC(=O)C=2C=C(O)C(O)=C(O)C=2)C(O)C1OC(=O)C1=CC(O)=C(O)C(O)=C1 NLDMNSXOCDLTTB-UHFFFAOYSA-N 0.000 description 1
- 230000005679 Peltier effect Effects 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000000313 electron-beam-induced deposition Methods 0.000 description 1
- 229910052732 germanium Inorganic materials 0.000 description 1
- GNPVGFCGXDBREM-UHFFFAOYSA-N germanium atom Chemical compound [Ge] GNPVGFCGXDBREM-UHFFFAOYSA-N 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 238000000227 grinding Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
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- 229910052751 metal Inorganic materials 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 239000008188 pellet Substances 0.000 description 1
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- 238000004544 sputter deposition Methods 0.000 description 1
- 230000002194 synthesizing effect Effects 0.000 description 1
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B19/00—Selenium; Tellurium; Compounds thereof
- C01B19/002—Compounds containing, besides selenium or tellurium, more than one other element, with -O- and -OH not being considered as anions
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B19/00—Selenium; Tellurium; Compounds thereof
- C01B19/007—Tellurides or selenides of metals
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- H—ELECTRICITY
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- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L31/00—Semiconductor devices sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
- H01L31/0248—Semiconductor devices sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof characterised by their semiconductor bodies
- H01L31/0256—Semiconductor devices sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof characterised by their semiconductor bodies characterised by the material
- H01L31/0264—Inorganic materials
- H01L31/0272—Selenium or tellurium
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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
- H10N10/01—Manufacture or treatment
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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
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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
- H10N10/853—Thermoelectric active materials comprising inorganic compositions comprising arsenic, antimony or bismuth
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2006/00—Physical properties of inorganic compounds
- C01P2006/32—Thermal properties
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2006/00—Physical properties of inorganic compounds
- C01P2006/40—Electric properties
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L31/00—Semiconductor devices sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
- H01L31/0248—Semiconductor devices sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof characterised by their semiconductor bodies
- H01L31/0256—Semiconductor devices sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof characterised by their semiconductor bodies characterised by the material
- H01L31/0264—Inorganic materials
- H01L31/0272—Selenium or tellurium
- H01L31/02725—Selenium or tellurium characterised by the doping material
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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
- H10N10/854—Thermoelectric active materials comprising inorganic compositions comprising only metals
Definitions
- the present invention relates to novel compound semiconductor materials that can be used in various applications, such as thermoelectric materials, solar cells, and methods for their preparation, and uses thereof.
- Compound A semiconductor is a compound which acts as a semiconductor by combining two or more elements rather than a single element such as silicon or germanium.
- Various kinds of such compound semiconductors are currently developed and used in various fields.
- a compound semiconductor may be used in a thermoelectric conversion element using a Peltier effect, a light emitting element such as a light emitting diode or a laser diode using the photoelectric conversion effect, and a solar cell.
- the solar cell is a tandem solar cell in which two or more layers of a silicon solar cell mainly using a single element of silicon, a compound semiconductor solar cell using a compound semiconductor, and a solar cell having different bandgap energy are stacked. And the like.
- compound semiconductor solar cells use compound semiconductors in the light absorption layer that absorbs sunlight to generate electron-hole pairs.
- Group II-VI compound semiconductors such as ZnS, the group I-III-VI compound semiconductor represented by CuInSe 2 , etc. can be used.
- the light absorbing layer of the solar cell is required to be excellent in long-term electrical and optical stability, high in photoelectric conversion efficiency, and to easily control band gap energy or conductivity by changing composition or doping.
- requirements such as manufacturing cost and yield must also be satisfied.
- many conventional compound semiconductors do not meet all of these requirements together.
- thermoelectric conversion element may be applied to thermoelectric conversion power generation, thermoelectric conversion cooling, and the like.
- the N type thermoelectric semiconductor and the P type thermoelectric semiconductor are electrically connected in series and thermally connected in parallel.
- thermoelectric conversion power generation is a form of power generation that converts thermal energy into electrical energy by using thermoelectric power generated by providing a temperature difference to a thermoelectric conversion element.
- thermoelectric conversion cooling is a form of cooling which converts electrical energy into thermal energy by taking advantage of the effect that a temperature difference occurs at both ends when a direct current flows through both ends of the thermoelectric conversion element.
- thermoelectric conversion element The energy conversion efficiency of such a thermoelectric conversion element is largely dependent on ZT which is a figure of merit of a thermoelectric conversion material.
- ZT may be determined according to Seebeck coefficient, electrical conductivity, thermal conductivity, and the like, and the higher the ZT value, the better the thermoelectric conversion material.
- thermoelectric conversion materials Although many thermoelectric conversion materials have been proposed so far, there is no suggestion that thermoelectric conversion materials having sufficient ZT values are secured. In particular, the need for a thermoelectric conversion material having a high ZT value at a low temperature such as a temperature range from room temperature to 250 ° C. is increasing. However, a thermoelectric conversion material having a sufficiently high thermoelectric conversion performance in such a temperature range has been provided. Can't see
- the present invention has been made to solve the above problems, and can be utilized for various purposes, such as thermoelectric conversion materials, solar cells, and the like of thermoelectric conversion devices. It aims at providing a manufacturing method and a thermoelectric conversion element, a solar cell, etc. using the same.
- the present inventors have succeeded in synthesizing the compound semiconductor represented by the following formula (1) after repeated studies on the compound semiconductor, and the compound is a thermoelectric conversion material of a thermoelectric conversion element, a light absorbing layer of a solar cell, or the like. It was confirmed that it can be used to complete the present invention.
- M is at least one selected from the group consisting of Cu, Fe, Co, Ag, and Ni, and 2.5 ⁇ x ⁇ 3.0, 3.0 ⁇ a ⁇ 3.5, 0 ⁇ y and 0 ⁇ z.
- y and z in Formula 1 satisfy the ranges of 0 ⁇ y ⁇ 0.009 and 0 ⁇ z ⁇ 0.09.
- y and z in Formula 1 may satisfy a range of 0.002 ⁇ y + z ⁇ 0.09.
- y 0.0068 may be used.
- the compound semiconductor may include forming a mixture comprising Bi, Te, and Se; Heat treating the mixture; Adding In to the heat-treated mixture; And pressure sintering the mixture to which the In is added.
- M may be further added together with In.
- the heat treatment step is performed by a solid phase reaction method.
- the pressure sintering may be performed by a discharge plasma sintering method.
- the compound semiconductor manufacturing method according to the present invention for achieving the above object comprises the steps of forming a mixture comprising Bi, Te and Se; Heat treating the mixture; Adding In to the heat-treated mixture; And pressure sintering the mixture to which In is added.
- the In addition step the In is added 0.1 wt% relative to the total weight of the compound semiconductor.
- M may be further added together with In.
- the heat treatment step is performed by a solid phase reaction method.
- the pressure sintering may be performed by a discharge plasma sintering method.
- thermoelectric conversion element according to the present invention for achieving the above object includes the compound semiconductor described above.
- the solar cell according to the present invention for achieving the above object includes the compound semiconductor described above.
- the bulk thermoelectric material according to the present invention for achieving the above object includes the compound semiconductor described above.
- thermoelectric conversion element a thermoelectric conversion element that can be used as a thermoelectric conversion element, a solar cell, or the like.
- the compound semiconductor according to the present invention can be used as another material in place of or in addition to the conventional compound semiconductor.
- thermoelectric conversion material of the thermoelectric conversion element can be used as the thermoelectric conversion material of the thermoelectric conversion element.
- a high ZT value is secured, and a thermoelectric conversion element having excellent thermoelectric conversion performance can be manufactured.
- thermoelectric conversion material having a high ZT value can be provided at a low temperature, particularly at a temperature ranging from room temperature to 250 ° C, a thermoelectric conversion element having good performance at low temperature can be manufactured.
- the compound semiconductor according to the present invention can be used as an N type thermoelectric conversion material.
- a compound semiconductor may be used in a solar cell.
- the compound semiconductor according to the present invention can be used as a light absorption layer of a solar cell.
- the compound semiconductor may be used in an IR window, an infrared sensor, a magnetic element, a memory, etc. for selectively passing infrared rays.
- FIG. 1 is a flowchart schematically showing a compound semiconductor manufacturing method according to the present invention.
- the present invention provides a novel compound semiconductor represented by the following formula (1).
- M is at least one selected from the group consisting of Cu, Fe, Co, Ag, and Ni, and 2.5 ⁇ x ⁇ 3.0, 3.0 ⁇ a ⁇ 3.5, 0 ⁇ y and 0 ⁇ z.
- the compound semiconductor according to the present invention further includes In in addition to Bi, Te, and Se, thereby improving electrical conductivity and / or lowering thermal conductivity, thereby providing a thermoelectric conversion material having an improved ZT value.
- the compound semiconductor according to the present invention can further improve thermoelectric conversion performance by selectively including M, that is, Cu, Fe, Co, Ag, Ni, and the like in addition to Bi, Te, and Se.
- In and M (Cu, Fe, Co, Ag, Ni) may be included in the thermoelectric material consisting of Bi, Te and Se to reduce the thermal conductivity.
- In or M may be located between the lattice and the lattice of the thermoelectric material composed of Bi, Te and Se, and may form an interface with these Bi, Te and Se.
- the scattering of phonon at such an interface may reduce the lattice thermal conductivity, thereby reducing the thermal conductivity of the compound semiconductor according to the present invention.
- In and M may contribute to increase the electrical conductivity.
- y may be 0 ⁇ y ⁇ 0.009.
- z may be 0 ⁇ z ⁇ 0.09.
- y + z is preferably 0.002 ⁇ y + z ⁇ 0.09. More preferably, in Chemical Formula 1, 0.005 ⁇ y + z ⁇ 0.05 is preferable.
- the compound semiconductor according to the present invention may have excellent thermoelectric conversion properties when In is added in an amount of 0.1 wt% based on the total weight of the compound.
- y 0.0068.
- the compound semiconductor according to the present invention may have excellent thermoelectric conversion properties when represented by the chemical formula of Bi 2 Te x Se ax In 0.0068 .
- the compound semiconductor according to the present invention may have excellent thermoelectric conversion properties when M, such as Cu, is added at 0.3 wt% based on the total weight of the compound.
- z may be 0.0369.
- the compound semiconductor according to the present invention may have excellent thermoelectric conversion properties when represented by the chemical formula of Bi 2 Te x Se ax In 0.0068 Cu 0.0369 .
- a may be a> 3.0.
- a material represented by Bi 2 Te x Se 3-x form is disclosed as a conventional N-type thermoelectric conversion material, and the compound semiconductor according to the present invention further includes In or M, and a total of Te and Se for Bi. By varying the content ratio, the thermoelectric conversion performance may be further improved.
- x may be 2.68, and a may be 3.14. That is, the compound semiconductor according to the present invention may be represented by the chemical formula of Bi 2 Te 2.68 Se 0.46 In y M z .
- the present inventors have continually studied the compound semiconductors according to the present invention to confirm that the thermoelectric conversion performance of the compound semiconductors can be further improved.
- the compound semiconductor represented by Formula 1 may include a part of the secondary phase, the amount may vary depending on the heat treatment conditions.
- FIG. 1 is a flowchart schematically illustrating a method of manufacturing a compound semiconductor according to an embodiment of the present invention.
- the method of manufacturing a compound semiconductor according to the present invention may include forming a mixture including Bi, Te, and Se (S110), heat treating the mixture (S120), and applying the mixture to the heat treated mixture. It may include the step of adding In (S130) and the step of sintering the mixture to which the In is added (S140).
- At least one (M) of Cu, Fe, Co, Ag, and Ni may be further added together with adding In.
- the BiTeSe-based powder for example, Bi 2 Te 2.68 Se 0.46 powder may be formed by reacting each element included in the mixture with each other.
- the heat treatment step may be performed for 10 hours to 15 hours in the temperature range of 350 °C to 450 °C.
- the raw material may be maintained at 400 ° C. for 12 hours, thereby allowing each raw material to react with each other.
- the step S120 may be performed by a solid state reaction (SSR) method.
- SSR solid state reaction
- an In element or an In element and an M element may be added in an amount of 0.1 wt% to 0.5 wt% based on the total weight of the mixture containing In and M elements.
- M element when M is added with In, M element may be added to 0.3 wt% based on the total weight of the mixture.
- the step S130 may add 0.1 wt% In, 0.3 wt% Cu based on the total weight of the mixture. In this composition range, the effect of improving the thermoelectric conversion performance due to the addition of the M element may be further increased.
- step S130 In and M mixed in the step S130 may be in powder form.
- the In 2 powder, and optionally Cu powder, Fe powder, Co powder, Ag powder or Ni powder may be added to the Bi 2 Te 2.68 Se 0.46 powder.
- the process can be simplified without melting raw materials or other complicated processes.
- the pressure sintering step S140 may be performed by a spark plasma sintering (SPS) method.
- SPS spark plasma sintering
- thermoelectric performance may vary depending on the sintering method.
- thermoelectric performance may be further improved when sintered by the SPS sintering method.
- the pressure sintering step (S140) is preferably performed under a pressure condition of 40MPa to 60MPa.
- the pressure sintering step (S140) is preferably performed under a temperature condition of 380 °C to 450 °C.
- the pressure sintering step S140 may be performed for 4 minutes to 10 minutes under the pressure and temperature conditions.
- thermoelectric performance there may be a difference in thermoelectric performance depending on the manufacturing method.
- the compound semiconductor according to the present invention may be manufactured by the compound semiconductor manufacturing method described above. In this case, it is possible to ensure a high ZT value for the compound semiconductor, in particular, it may be advantageous to secure a high ZT value in the temperature range of 20 °C to 250 °C.
- thermoelectric conversion element according to the present invention may include the compound semiconductor described above. That is, the compound semiconductor according to the present invention can be used as a thermoelectric conversion material of the thermoelectric conversion element.
- the thermoelectric element according to the present invention may include the compound semiconductor described above as an N-type thermoelectric material.
- the compound semiconductor according to the present invention has a large ZT which is a figure of merit of a thermoelectric conversion material.
- the Seebeck coefficient and electrical conductivity are high, and the thermal conductivity is low, so the thermoelectric conversion performance is excellent. Therefore, the compound semiconductor according to the present invention can be usefully used in a thermoelectric conversion element in place of or in addition to a conventional thermoelectric conversion material.
- the compound semiconductor according to the present invention can be applied to bulk thermoelectric conversion materials. That is, the bulk thermoelectric material according to the present invention includes the compound semiconductor described above.
- the solar cell according to the present invention may include the compound semiconductor described above. That is, the compound semiconductor according to the present invention can be used as a light absorbing layer of solar cells, in particular solar cells.
- the solar cell can be manufactured in a structure in which a front transparent electrode, a buffer layer, a light absorbing layer, a back electrode, a substrate, and the like are sequentially stacked from the side where sunlight is incident.
- the bottommost substrate may be made of glass, and the back electrode formed on the entire surface may be formed by depositing a metal such as Mo.
- the light absorbing layer may be formed by stacking the compound semiconductor according to the present invention on the back electrode by an electron beam deposition method, a sol-gel method, or a pulsed laser deposition (PLD) method.
- PLD pulsed laser deposition
- the buffer layer may be formed of a material such as CdS (Chemical Bath Deposition). It can be formed by depositing in the manner of.
- a front transparent electrode may be formed on the buffer layer by a layered film of ZnO or ZnO and ITO by sputtering or the like.
- the solar cell according to the present invention may be variously modified.
- stacked the solar cell using the compound semiconductor which concerns on this invention as a light absorption layer can be manufactured.
- stacked in this way can use the solar cell using silicon or another known compound semiconductor.
- the band gap of the compound semiconductor of the present invention by changing the band gap of the compound semiconductor of the present invention, a plurality of solar cells using compound semiconductors having different band gaps as light absorbing layers can be laminated.
- the band gap of the compound semiconductor according to the present invention can be controlled by changing the composition ratio of the constituent elements constituting the compound, such as Te.
- the compound semiconductor according to the present invention may be applied to an infrared window (IR window) or an infrared sensor for selectively passing infrared rays.
- IR window infrared window
- infrared sensor for selectively passing infrared rays.
- the powder thus synthesized was pressurized to 50 MPa and sintered by SPS (Spark Plasma Sintering) for 5 minutes at 400 ° C.
- SPS Spark Plasma Sintering
- electrical conductivity was measured by using a 2-point probe method using ZEM-3 (Ulvac-Rico, Inc).
- thermal conductivity was measured by the laser flash method using LFA457 (Netzsch). More specifically, the laser was irradiated to one side of the sample in pellet form, and then the temperature of the opposite side was measured to calculate the thermal diffusivity, and the thermal conductivity of the sample was measured by multiplying the thermal diffusivity by the density of the sample and the specific heat. .
- the In-added material was pressurized to 50 MPa and sintered by SPS (Spark Plasma Sintering) for 5 minutes at 400 ° C.
- SPS Spark Plasma Sintering
- Bi, Te, and Se shots were prepared, ground, and mixed in a hand-mill to prepare a mixture of Bi 2 Te 2.68 Se 0.46 compositions.
- the mixture was placed in a quartz tube and vacuum sealed to form an ampoule.
- the ampoule was placed in a tube furnace and subjected to a heat treatment for 12 hours at a temperature of 400 ° C.
- the In-added material was pressurized to 50 MPa and sintered by SPS (Spark Plasma Sintering) for 5 minutes at 400 ° C.
- SPS Spark Plasma Sintering
- Bi, Te, and Se shots were prepared, ground, and mixed in a hand-mill to prepare a mixture of Bi 2 Te 2.68 Se 0.46 compositions.
- the mixture was placed in a quartz tube and vacuum sealed to form an ampoule.
- the ampoule was placed in a tube furnace and subjected to a heat treatment for 12 hours at a temperature of 400 ° C.
- the In and Cu-added material was pressurized to 50 MPa and sintered by SPS (Spark Plasma Sintering) for 5 minutes at 400 ° C.
- SPS Spark Plasma Sintering
- the compound semiconductors of Examples 1 to 3 according to the present invention have a very high ZT value compared to the compound semiconductors of the comparative example.
- the ZT value shows a big difference from the comparative example.
- ZT value is generally 1.25 or more, and shows a big difference with the comparative example which is less than 0.7.
- the ZT value is significantly larger than that of the compound semiconductor of the comparative example. This may be due to the compound semiconductor according to the present invention, due to the high electrical conductivity and / or low thermal conductivity compared to the compound semiconductor of the comparative example. Therefore, the compound semiconductor according to the embodiment of the present invention can be said to have excellent thermoelectric conversion performance, and thus can be very usefully used as a thermoelectric conversion material.
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Abstract
Description
Claims (19)
- 하기 화학식 1로 표시되는 화합물 반도체.<화학식 1>Bi2TexSea-xInyMz상기 화학식 1에서, M은 Cu, Fe, Co, Ag 및 Ni로 이루어진 군으로부터 선택된 적어도 어느 하나 이상이고, 2.5<x<3.0, 3.0≤a<3.5, 0<y 및 0≤z이다.
- 제1항에 있어서,상기 화학식 1의 y 및 z는, 0<y<0.009 및 0≤z<0.09인 것을 특징으로 하는 화합물 반도체.
- 제1항에 있어서,상기 화학식 1의 y+z는, 0.002<y+z<0.09인 것을 특징으로 하는 화합물 반도체.
- 제1항에 있어서,상기 화학식 1의 y는 0.0068인 것을 특징으로 하는 화합물 반도체.
- 제1항에 있어서,상기 화학식 1의 z는 0.0369인 것을 특징으로 하는 화합물 반도체.
- 제1항에 있어서,상기 화학식 1의 a는, a>3.0인 것을 특징으로 하는 화합물 반도체.
- 제1항에 있어서,Bi, Te 및 Se를 포함하는 혼합물을 형성하는 단계;상기 혼합물을 열처리하는 단계;상기 열처리된 혼합물에 In을 첨가하는 단계; 및상기 In이 첨가된 혼합물을 가압 소결하는 단계를 포함하는 제조 방법에 의해 제조된 화합물 반도체.
- 제7항에 있어서,상기 In 첨가 단계는, 상기 In과 함께 M을 더 첨가하는 것을 특징으로 하는 화합물 반도체.
- 제7항에 있어서,상기 열처리 단계는, 고체상 반응 방식에 의해 수행되는 것을 특징으로 하는 화합물 반도체.
- 제7항에 있어서,상기 가압 소결 단계는, 방전 플라즈마 소결 방식에 의해 수행되는 것을 특징으로 하는 화합물 반도체.
- Bi, Te 및 Se를 포함하는 혼합물을 형성하는 단계;상기 혼합물을 열처리하는 단계;상기 열처리된 혼합물에 In을 첨가하는 단계; 및상기 In이 첨가된 혼합물을 가압 소결하는 단계를 포함하는 제1항의 화합물 반도체의 제조 방법.
- 제11항에 있어서,상기 In 첨가 단계는, 상기 In을 전체 중량 대비 0.1 wt% 첨가하는 것을 특징으로 하는 화합물 반도체의 제조 방법.
- 제11항에 있어서,상기 In 첨가 단계는, 상기 In과 함께 M을 더 첨가하는 것을 특징으로 하는 화합물 반도체의 제조 방법.
- 제11항에 있어서,상기 열처리 단계는, 고체상 반응 방식에 의해 수행되는 것을 특징으로 하는 화합물 반도체의 제조 방법.
- 제11항에 있어서,상기 가압 소결 단계는, 방전 플라즈마 소결 방식에 의해 수행되는 것을 특징으로 하는 화합물 반도체의 제조 방법.
- 제1항 내지 제10항 중 어느 한 항에 따른 화합물 반도체를 포함하는 열전 변환 소자.
- 제16항에 있어서,제1항 내지 제10항 중 어느 한 항에 따른 화합물 반도체를 N타입 열전 변환 재료로 포함하는 것을 특징으로 하는 열전 변환 소자.
- 제1항 내지 제10항 중 어느 한 항에 따른 화합물 반도체를 포함하는 태양 전지.
- 제1항 내지 제10항 중 어느 한 항에 따른 화합물 반도체를 포함하는 벌크 열전 재료.
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