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SILICON BULK THERMOELECTRIC CONVERSION MATERIAL NEW

外国特許コード F190009877
整理番号 AF51-01WO
掲載日 2019年7月29日
出願国 世界知的所有権機関(WIPO)
国際出願番号 2018JP047940
国際公開番号 WO 2019131795
国際出願日 平成30年12月26日(2018.12.26)
国際公開日 令和元年7月4日(2019.7.4)
優先権データ
  • 特願2017-249463 (2017.12.26) JP
発明の名称 (英語) SILICON BULK THERMOELECTRIC CONVERSION MATERIAL NEW
発明の概要(英語) Provided is a silicon bulk thermoelectric conversion material for which thermoelectric performance is improved over the prior art by reducing the thermal conductivity of silicon. In the silicon bulk thermoelectric conversion material, the ZT exceeds 0.2 at room temperature with silicon alone. The silicon bulk thermoelectric conversion material has a plurality of silicon grains measuring 1-300 nm, first voids measuring 1-30 nm on average that are present in the plurality of silicon grains and on the surfaces of the silicon grains, and second voids measuring 100-300 nm on average that are present between the plurality of silicon grains. The silicon grains have an aspect ratio of less than 10.
従来技術、競合技術の概要(英語) BACKGROUND ART
In recent years, aiming at improvement of the performance of the thermoelectric conversion material has been research. The thermoelectric conversion is, mutual conversion between heat and electricity and a device capable of directly, this makes it possible to use waste heat from a cold heat source of such is difficult to generate electricity from the can, including a power source such as IoT of sensing device has attracted attention as an energy harvesting device. The performance of the thermoelectric conversion material, represented by the dimensionless performance index ZT.
In this case, S is the Seebeck coefficient, σ is the electrical conductivity, T is the absolute temperature, κ is thermal conductivity. As is clear from this equation, the performance of the thermoelectric conversion material, (1) Seebeck coefficient or electrical conductivity or to improve the σ S, (2) which reduces the thermal conductivity κ, can be improved by any of the.
The group of research in recent years, the ZT is significantly greater than the 1 reported research. On the other hand, when considering the use as energy harvesting device, a significant improvement in ZT is not absolutely necessary, the manufacturing cost can be reduced if high ZT is not necessarily required. However, reported so far most of the study, is highly toxic environmental adaptability of the expensive material or a material having a low used. Therefore, the cost-effectiveness of the above it is not possible to solve such a problem, with the popularization of thermoelectric conversion device, has not been put into practical use. In this case, when viewed from the viewpoint of production cost, the amount of silicon is buried in the high, non-toxicity, a material having a high stability, and currently in widespread use can be can be applied to the silicon processing technology, a promising material as a thermoelectric conversion material. However, silicon has a thermal conductivity of 100 W/m/K or higher, the thermoelectric conversion material may be a simple and practical at all about ZT value is 0.005 at present is not suitable. Therefore, Patent Document 1 is' an aspect ratio greater than 10' and having a thermal conductivity of the nanowires so as to reduce by (claim 1, such as paragraph 0009). In addition, Patent Document 2 is' magnesium, silicon alloy, magnesium, silicon, tin, silicon, or silicon, and germanium alloy as a main component, having a large number of minute holes can be made of a porous body and the thermoelectric material ' are means for solving, this is because, a single small silicon or doped silicon is not practical from the obtained ZT value, based on the alloy material (such as germanium) thermoelectric material means that the seeking.
  • 出願人(英語)
  • ※2012年7月以前掲載分については米国以外のすべての指定国
  • JAPAN SCIENCE AND TECHNOLOGY AGENCY
  • 発明者(英語)
  • SHIOMI Junichiro
  • KASHIWAGI Makoto
  • KODAMA Takashi
国際特許分類(IPC)
指定国 National States: AE AG AL AM AO AT AU AZ BA BB BG BH BN BR BW BY BZ CA CH CL CN CO CR CU CZ DE DJ DK DM DO DZ EC EE EG ES FI GB GD GE GH GM GT HN HR HU ID IL IN IR IS JO JP KE KG KH KN KP KR KW KZ LA LC LK LR LS LU LY MA MD ME MG MK MN MW MX MY MZ NA NG NI NO NZ OM PA PE PG PH PL PT QA RO RS RU RW SA SC SD SE SG SK SL SM ST SV SY TH TJ TM TN TR TT TZ UA UG US UZ VC VN ZA ZM ZW
ARIPO: BW GH GM KE LR LS MW MZ NA RW SD SL SZ TZ UG ZM ZW
EAPO: AM AZ BY KG KZ RU TJ TM
EPO: AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR
OAPI: BF BJ CF CG CI CM GA GN GQ GW KM ML MR NE SN ST TD TG
参考情報 (研究プロジェクト等) CREST Scientific Innovation for Energy Harvesting Technology AREA
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