Improvement of thermoelectric properties by use of impurity states, and development of new high-performance thermoelectric materials

• Project/Area Number: 18H01695
• Research Category: Grant-in-Aid for Scientific Research (B)
• Allocation Type: Single-year Grants
• Section: 一般
• Review Section: Basic Section 26010:Metallic material properties-related
• Research Institution: Toyota Technological Institute
• Principal Investigator: Takeuchi Tsunehiro 豊田工業大学, 工学(系)研究科(研究院), 教授 (00293655)
• Project Period (FY): 2018-04-01 – 2021-03-31
• Project Status: Completed (Fiscal Year 2020)
• Budget Amount: ¥17,290,000 (Direct Cost: ¥13,300,000、Indirect Cost: ¥3,990,000); Fiscal Year 2020: ¥4,290,000 (Direct Cost: ¥3,300,000、Indirect Cost: ¥990,000); Fiscal Year 2019: ¥7,540,000 (Direct Cost: ¥5,800,000、Indirect Cost: ¥1,740,000); Fiscal Year 2018: ¥5,460,000 (Direct Cost: ¥4,200,000、Indirect Cost: ¥1,260,000)
• Keywords: 熱電材料 / 熱電発電 / ゼーベック係数 / 電気伝導度 / 熱伝導度 / 電子構造 / 不純物準位 / 強散乱極限 / 熱電物性 / ナノ結晶 / 電子構造制御 / 電子構造計算 / 熱電素子 / 無次元性能指数 / 格子熱伝導度 / バンド計算 / 出力因子 / スペクトル伝導度 / 第一原理計算 / 電子輸送現象 / 熱輸送 / フォノン分散

Outline of Final Research Achievements

In this project, we tried to improve the performance of thermoelectric materials using the impurity states produced by dilute impurity elements under the condition of strongest scattering limit of conduction electrons.
We employed Si-Ge system as one of the typical thermoelectric materials, and found that 1 at.% Fe possesses a potential to greatly increase the magnitude of dimensionless figure of merit of n-type samples. Tiny amount of Au and Ni, which is less than a few at.%, were also found to improve thermoelectric performance of p-type Si-Ge.The strategy, with which we successfully improve the thermoelectric performance of Si-Ge, was also used for other thermoelectric materials, such as silver chalcogenides, and its validity was confirmed by the increase of their dimensionless figure of merit.
We stress here that the our newly proposed strategy to develop a high-performance thermoelectric materials should lead to the practical use of thermoelectric generators.

Academic Significance and Societal Importance of the Research Achievements

本研究では，熱電材料の物性を建設的に制御する指針を与えるとともに，実際に，複数の材料系で，新しい高性能熱電材料の開発に至った．理論的な予測を実験で検証することで，提案する指針が正しいことを証明したことから，同様の指針を用いた熱電材料の開発が促されると考えられる．また，この指針を用いた材料開発が活発に行われることで，エネルギー変換効率が高い熱電発電素子の開発が行われるようになり，排熱からの熱電発電により省エネルギー化が進む．同時に，カーボンニュートラルの実現に向けて，大きな寄与をすると判断される．

Research Products

• [Int'l Joint Research] 桂林電子科技大学(中国)
• [Int'l Joint Research] Indian Institute of Technology, Mandi(インド)
• [Int'l Joint Research] University of Genova/CNR-ICMATE/University of Pavia(イタリア)
• [Int'l Joint Research] University of Genova/Technologies for Energy, CNR-ICMATE,/University of Pavia(イタリア)
• [Int'l Joint Research] SRM IST, Chennai(インド)
• [Int'l Joint Research] CEA/LITEN Lab. de Thermoelectricite/CNRS-Saint Gobain(フランス)
• [Int'l Joint Research] RGS Development, Broek op Langedijk(オランダ)
• [Int'l Joint Research] 深セン大学(中国)
• [Int'l Joint Research] SRM大学(インド)
• [Journal Article] High Dimensionless Figure of Merit <i>ZT</i> = 1.38 Achieved in p-Type Si–Ge–Au–B Thin Film (2020)
  • Author(s): M. Adachi, S. Nishino, K. Hirose, M. Kiyama, Y. Yamamoto, and T. Takeuchi
  • Journal Title: MATERIALS TRANSACTIONS Volume: 61 Issue: 5 Pages: 1014-1019
  • DOI: 10.2320/matertrans.MT-M2019310
  • NAID: 130007835737
  • ISSN: 1345-9678, 1347-5320
  • Year and Date: 2020-05-01
  • Peer Reviewed / Open Access
• [Journal Article] Hard x-ray photoemission spectroscopy of rhenium substituted higher manganese silicides (2020)
  • Author(s): M. Matsunami, T. Iizuka, S. Ghodke, A. Yamamoto, H. Miyazaki, and T. Takeuchi
  • Journal Title: Journal of Applied Physics Volume: 127 Issue: 3 Pages: 035103-035103
  • DOI: 10.1063/1.5128185
  • Peer Reviewed
• [Journal Article] Effects of 5d-heavy element partial substitution on thermal transport in Fe2VAl thin films (2020)
  • Author(s): S. Choi, S. Hiroi, M. Inukai, S. Nishino, R. Sobota, D. Byeon, M. Mikami, M. Matsunami, and T. Takeuchi
  • Journal Title: Physical Review B Volume: 101 Issue: 10 Pages: 104312-104312
  • DOI: 10.1103/physrevb.101.104312
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Investigation of Thermoelectric Properties of Ag2SxSe1-x (x = 0.0, 0.2 and 0.4) (2020)
  • Author(s): S. Singh, K. Hirata, D. Byeon, T. Matsunaga, O. Muthusamy, S. Ghodke, M. Adachi, Y. Yamamoto, M. Matsunami, and T. Takeuchi
  • Journal Title: Journal of Electronic Materials Volume: 49 Issue: 5 Pages: 2813-2824
  • DOI: 10.1007/s11664-019-07857-5
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Realizing high thermoelectric performance in p-type Si1-x-yGexSny thin films at ambient temperature by Sn modulation doping (2020)
  • Author(s): Ying Peng, Huajun Lai, Chengyan Liu, Jie Gao, Masashi Kurosawa, Osamu Nakatsuka, Tsunehiro Takeuchi, Shigeaki Zaima, Sakae Tanemura, Lei Miao
  • Journal Title: Applied Physics Letters Volume: 117 Issue: 5 Pages: 053903-053903
  • DOI: 10.1063/5.0012087
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Crossover in periodic length dependence of thermal conductivity in 5 fidelement substituted Fe 2 VAl-based superlattices (2020)
  • Author(s): Seongho Choi, Satoshi Hiroi, Manabu Inukai, Shunsuke Nishino, Robert Sobota, Dogyun Byeon, Masashi Mikami, Emi Minamitani, Masaharu Matsunami, Tsunehiro Takeuchi
  • Journal Title: Physical Review B Volume: 102 Issue: 10 Pages: 104301-104301
  • DOI: 10.1103/physrevb.102.104301
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Silicon‐based Low-dimensional materials for thermal conductivity suppression: Recent advances and new strategies to high thermoelectric efficiency (2020)
  • Author(s): Huajun Lai, Ying Peng, Jie Gao, Masashi Kurosawa, Osamu Nakatsuka, Tsunehiro Takeuchi, Lei Miao
  • Journal Title: Japanese Journal of Applied Physics Volume: 60 Issue: SA Pages: SA0803-SA0803
  • DOI: 10.35848/1347-4065/abbb69
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Cooling-free infrared sensors with high-performance thermoelectric materials (2020)
  • Author(s): K. Hirose, M. Adachi, M. Murata, Y. Yamamoto, and T. Takeuchi
  • Journal Title: Proceedings of SPIE, Quantum Sensing and Nano Electronics and Photonics XVII Volume: 11288 Pages: 1128801-1128801
  • DOI: 10.1117/12.2541835
  • Peer Reviewed
• [Journal Article] Au and B co-doped p-type Si-Ge nanocomposites possessing ZT = 1.63 synthesized by ball milling and low-temperature sintering (2019)
  • Author(s): Muthusamy Omprakash, Kevin Delime-Codrin, Swapnil Ghodke, Saurabh Singh, Shunsuke Nishino, Yoshiyuki Yamamoto, Masaharu Matsunami, Harish Santhanakrishnan, Masaru Shimomura, Tsunehiro Takeuchi
  • Journal Title: Japanese Journal of Applied Physics Volume: 58 Issue: 12 Pages: 125501-125501
  • DOI: 10.7567/1347-4065/ab4fb9
  • NAID: 210000157402
  • Peer Reviewed
• [Journal Article] Improved Thermoelectric Properties of Re-Substituted Higher Manganese Silicides by Inducing Phonon Scattering and an Energy-Filtering Effect at Grain Boundary Interfaces (2019)
  • Author(s): Swapnil Ghodke, Akio Yamamoto, Hsuan-Chun Hu, Shunsuke Nishino, Takuya Matsunaga, Dogyun Byeon, Hiroshi Ikuta, Tsunehiro Takeuchi
  • Journal Title: ACS Applied Materials Interfaces Volume: 11 Issue: 34 Pages: 31169-31169
  • DOI: 10.1021/acsami.9b09397
  • Peer Reviewed
• [Journal Article] Fabrication of ultrathin poly-crystalline SiGe-on-insulator layer for thermoelectric applications (2019)
  • Author(s): C.P. Goyal, M. Omprakash, M. Navaneethan, T. Takeuchi, Y. Shimura, M. Shimomura, S. Ponnusamy, Y. Hayakawa, H. Ikeda
  • Journal Title: Journal of Physics Communications Volume: 3 Issue: 7 Pages: 075007-075007
  • DOI: 10.1088/2399-6528/ab302f
  • Peer Reviewed / Open Access
• [Journal Article] Large figure of merit ZT = 1.88 at 873 K achieved with nanostructured Si0.55Ge0.35(P0.10Fe0.01) (2019)
  • Author(s): K. Delime-Codrin, M. Omprakash, S. Ghodke, R. Sobota, M. Adachi, M. Kiyama, T. Matsuura, Y. Yamamoto, M. Matsunami, and T. Takeuchi
  • Journal Title: Applied Physics Express Volume: 12 Issue: 4 Pages: 0455071-7
  • DOI: 10.7567/1882-0786/ab08b7
  • NAID: 210000135661
  • Peer Reviewed
• [Journal Article] Discovery of Colossal Seebeck Effect in Metallic Cu2Se (2019)
  • Author(s): D. Byeon, R. Sobota , K. Delime-Codrin, S. Choi, K. Hirata, M. Adachi, M. Kiyama, T. Matsuura, Y. Yamamoto, M. Matsunami, and T. Takeuchi
  • Journal Title: Nature Communications Volume: 10 Issue: 1 Pages: 721-7
  • DOI: 10.1038/s41467-018-07877-5
  • Peer Reviewed / Open Access
• [Journal Article] Optimization of thermoelectric properties achieved in Cu doped β-In2S3 bulks (2019)
  • Author(s): Yue-Xing Chen, Fu Li, Wenting Wang, Zhuanghao Zheng, Jingting Luo, Ping Fan, TsunehiroTakeuchi
  • Journal Title: Journal of Alloys and Compounds Volume: 782 Pages: 641-647
  • DOI: 10.1016/j.jallcom.2018.12.220
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Effects of Re substitution for Mn on microstructures and properties in Re-substituted higher manganese silicide thermoelectric material (2019)
  • Author(s): T. Homma, T. Kamata, N. Saito, S. Ghodke, T. Takeuchi
  • Journal Title: Journal of Alloys and Compounds Volume: 776 Pages: 8-15
  • DOI: 10.1016/j.jallcom.2018.10.209
  • Peer Reviewed
• [Journal Article] Effective Decrease of the Thermal Conductivity Caused by Hf in Fe(V_0.955−<i>_x</i>Hf_0.045Ti<i>_x</i>)Sb Half-Heusler Phase (2018)
  • Author(s): K. Delime-Codrin, G. Swapnil, D. Byeon, R. Sobota, M. Matsunami and T. Takeuchi
  • Journal Title: MATERIALS TRANSACTIONS Volume: 59 Issue: 10 Pages: 1637-1644
  • DOI: 10.2320/matertrans.M2018171
  • NAID: 130007489861
  • ISSN: 1345-9678, 1347-5320
  • Year and Date: 2018-10-01
  • Peer Reviewed
• [Journal Article] Influence of Au on Ge Crystallization and Its Thermoelectric Properties in a Au-induced Ge Crystallization Technique (2018)
  • Author(s): S. Shanthi, K. Faizan, S. Nishino, M. Omprakash, T. Takeuchi, Y. Shimura, Y. Hayakawa, C. Muthamizhchelvan, and H. Ikeda
  • Journal Title: Journal of Advanced Physics Volume: 14 Issue: 2 Pages: 5460-5466
  • DOI: 10.24297/jap.v14i2.7421
  • Peer Reviewed / Int'l Joint Research
• [Presentation] Study of thin films of the filled skutterudite Smy(FexNi1-x)4Sb12 (2020)
  • Author(s): Giovanna Latronico, Paolo Mele, Cristina Artini, Carlo Fanciulli, Pietro Manfrinetti, Saurabh Singh, Tsunehiro Takeuchi
  • Organizer: 第81回応用物理学会秋季学術講演会
• [Presentation] High thermoelectric performance of Si-Ge alloy by modifying the electronic structure (2020)
  • Author(s): Omprakash Muthusamy, Saurabh Singh, Masahiro Adachi, Yoshiyuki Yamamoto, Tsunehiro Takeuchi
  • Organizer: 第81回応用物理学会秋季学術講演会
• [Presentation] 熱電材料の設計指針と高性能材料開発の現状 (2020)
  • Author(s): 竹内恒博
  • Organizer: 第81回応用物理学会秋季学術講演会
  • Invited
• [Presentation] 物性基礎研究から高性能熱電材料開発への展開 (2020)
  • Author(s): 竹内恒博
  • Organizer: 第17回日本熱電学会学術講演会
  • Invited
• [Presentation] Effect of deformation and annealing effect on Thermoelectric Properties of flexible Ag2S1-xSex (0 < x < 0.55) Material for Energy Applications (2020)
  • Author(s): S. Singh, K. Hirata, O. Muthusamy, G. Kim, Y. Peng, M. Ryu, D. Byeon, M. Matsunami, T. Takeuchi
  • Organizer: 第68回応用物理学会春季学術講演会
• [Presentation] Si-Ge系高性能p型熱電材料の開発 (2020)
  • Author(s): 太田侑希, 正岡伊織, M. Omprakash, 久保直人, 田橋正浩, 後藤英雄, 松波雅治, 竹内恒博
  • Organizer: 第68回応用物理学会春季学術講演会
• [Presentation] Thermoelectric properties of p-type Si-Ge-(Fe,Ni,V,Ti)-B alloys (2020)
  • Author(s): O. Muthusamy, S. Singh, M. Adachi, Y. Yamamoto, T. Takeuchi
  • Organizer: 第68回応用物理学会春季学術講演会
• [Presentation] 高圧低温焼結によるCrSi2の熱電物性 (2020)
  • Author(s): 原惇, Choi Seongho, 松波雅治, 竹内恒博
  • Organizer: 第68回応用物理学会春季学術講演会
• [Presentation] 高性能p型Si-Ge系熱電材料の開発 (2019)
  • Author(s): 竹内恒博, ムスサミー オンプラカシ, デリムコドリー ケビン, ゴドゥケ スワプニル, 松波雅治
  • Organizer: 日本金属学会 2020年春期 第166回講演大会
• [Presentation] Improved thermoelectric performance of p-type Si-Ge alloy (2019)
  • Author(s): Omprakash Muthusamy, Saurabh Singh, Masahiro Adachi, Yoshiyuki Yamamoto, Tsunehiro Takeuchi
  • Organizer: 第67回応用物理学会春季学術講演会
• [Presentation] Synthesis, characterization and densification of n- and p-types skutterudites belonging to the Smy(Fe1-xNix)4Sb12 system to be used as substrates for wettability studies. (2019)
  • Author(s): Giovanna Latronico, Paolo Mele, Shrikant Saini, Fabrizio Valenza, Riccardo Carlini, Seongho Choi, Tsunehiro Takeuchi, Angelica Baldini, Umberto Anselmi-Tamburini, Cristina Artini
  • Organizer: 第67回応用物理学会春季学術講演会
  • Int'l Joint Research
• [Presentation] Tuning the thermoelectric property of flexible Ag2S material by non-toxic transition metal substitution (2019)
  • Author(s): Saurabh Singh, Keisuke Hirata, Gareoung Kim, Dogyun Byeon, Takashi Nagaya, Omprakash Muthusamy, Masaharu Matsunami, Tsunehiro Takeuchi
  • Organizer: 第67回応用物理学会春季学術講演会
• [Presentation] 高性能熱電材料の開発 材料設計における多元系の意義 (2019)
  • Author(s): 竹内恒博
  • Organizer: 第67回応用物理学会春季学術講演会
  • Invited
• [Presentation] Flexible Inorganic Thermoelectric Materials Ag2(S1-xSex) (2019)
  • Author(s): Saurabh SINGH, Keisuke HIRATA, Takuya MATSUNAGA, Dogyun BYEON, Masaharu MATSUNAM, Tsunehiro TAKEUCHI
  • Organizer: Materials Research Meeting 2019 (MRM2019)
  • Int'l Joint Research
• [Presentation] Enhanced thermoelectric properties of Si-Ge by tuning boron concentration and dispersion of Au nanoparticle in Si-Ge matrix synthesized by high-pressure and low-temperature sintering process (2019)
  • Author(s): Omprakash Muthusamy, Tsunehiro Takeuchi
  • Organizer: Materials Research Meeting 2019 (MRM2019)
  • Int'l Joint Research
• [Presentation] New concept to effectively increase ZT and development of high-performance Si-Ge based thermoelectric materials (2019)
  • Author(s): Tsunehiro Takeuchi
  • Organizer: Materials Research Meeting 2019 (MRM2019)
  • Int'l Joint Research / Invited
• [Presentation] 世界最高性能を示すバルク熱電材料の開発 (2019)
  • Author(s): 竹内恒博
  • Organizer: 粉末粉体冶金協会 2019年度秋期大会（第124回講演大会）
  • Invited
• [Presentation] Improvement of thermoelectric properties of Ag2S by Se substitution (2019)
  • Author(s): Saurabh Singh, Keisuke Hirata, Dogyun Byeon, Swapnil Ghodke, Masaharu Matsunami, Masahiro Adachi, Yoshiyuki Yamamoto, Tsunehiro Takeuchi
  • Organizer: 第80回応用物理学会秋季学術講演会
• [Presentation] Thermal stability analysis and thermoelectric properties of supersaturated solid-solution of Silicon-Germanium-Phosphorous (2019)
  • Author(s): Swapnil Chetan Ghodke, Muthusamy Omprakash, Kevin Delime Codrin, Masahiro Adachi, Yoshiyuki Yamamoto, Tsunehiro Takeuchi
  • Organizer: 第80回応用物理学会秋季学術講演会
• [Presentation] ZT>2を示すSi-Ge系熱電材料の開発 (2019)
  • Author(s): 竹内 恒博, スワプニル ゴドゥケ, ムスサミー オンプラカシ, サウラブ シン, ケビン デリム－コドリー, 足立 真寛, 山本 喜之
  • Organizer: 日本金属学会 2019年秋期（第165回）講演大会
• [Presentation] Distinctive thermoelectric properties of supersaturated Si-Ge-P compounds: Achieving a very large figure magnitude of merit (2019)
  • Author(s): Swapnil Ghodke, Tsunehiro Takeuchi
  • Organizer: 第15回日本熱電学会学術講演会（TSJ2019）
• [Presentation] M. Omprakash, G. Swapnil, S. Singh, M. Adachi, Y. Yamamoto, T. Takeuchi (2019)
  • Author(s): D. Byeon, R. Sobota, K. D. Codrin, S. Choi, K. Hirata, M. Adachi, Y. Yamamoto, M. Matsunami, T. Takeuchi
  • Organizer: 第15回日本熱電学会学術講演会（TSJ2019）
• [Presentation] Investigation of electronic and thermoelectric properties of Ag2-xTMxS (TM = Ti, V, Cr, Mn, Fe, Co, Ni, Cu) from first principle calculations (2019)
  • Author(s): S. Singh, K. Hirata, M. Adachi, Y. Yamamoto, M. Matsunami, T. Takeuchi
  • Organizer: 第15回日本熱電学会学術講演会（TSJ2019）
• [Presentation] Thermoelectric Properties of Heavily doped Nano-structured n-type Silicon-Germanium Alloys (2019)
  • Author(s): S. Ghodke, M. Omprakash, K. Delime-Codrin, M. Adachi, M. Kiyama, T. Matsuura, Y. Yamamoto, and T. Takeuchi
  • Organizer: The Fifth Asia-Pacific Conference on Semiconducting Silicides and Related Materials (APAC-SILICIDE 2019)
  • Int'l Joint Research
• [Presentation] Thermoelectric Properties of Ag2(S1-xSex) (2019)
  • Author(s): Saurabh Singh, Keisuke Hirata, Dogyun Byeon, Omprakash Muthusamy, Masaharu Matsunami, Tsunehiro Takeuchi
  • Organizer: The 38th | 4th International & Asian Conference on Thermoelectrics (ICT/ACT 2019)
  • Int'l Joint Research
• [Presentation] Thermoelectric properties of heavily doped semicrystalline Si-Ge-P compounds (2019)
  • Author(s): Swapnil Ghodke, Tsunehiro Takeuchi
  • Organizer: The 38th | 4th International & Asian Conference on Thermoelectrics (ICT/ACT 2019)
  • Int'l Joint Research
• [Presentation] Heavy element dependence of thermal conductivity in Fe2VAl based superlattice thin film (2019)
  • Author(s): Seongho Choi, Satoshi Hiroi, Manabu Inukai, Robert Sobota, Dogyun Byeon, Masaharu Matsunami and Tsunehiro Takeuchi
  • Organizer: The 38th | 4th International & Asian Conference on Thermoelectrics (ICT/ACT 2019)
  • Int'l Joint Research
• [Presentation] High ZT = 1.6 at 973 K achieved in B-doped Si-Ge-Au nanocrystalline synthesized by high pressure and low temperature sintering process (2019)
  • Author(s): Muthusamy Omprakash, Shunsuke Nishino, Masahiro Adachi, Saurabh Singh, Ghodke Swapnil, Yoshiyuki Yamamoto, Tsunehiro Takeuchi
  • Organizer: The 38th | 4th International & Asian Conference on Thermoelectrics (ICT/ACT 2019)
  • Int'l Joint Research
• [Presentation] AuとBを共添加したSi-Ge系薄膜の熱電特性 (2018)
  • Author(s): 廣瀬 光太郎, 足立 真寬, 西野 俊佑, 山本 喜之, 竹内 恒博
  • Organizer: 第66回応用物理学会春季学術講演会（東京工業大学 大岡山キャンパス，2019/3/9）
• [Presentation] Large evolution of ZT in p-type nanocrystalline bulk Si-Ge (2018)
  • Author(s): オムプラカシ ムスサミー, ゴドケ スワプニル, デリムコドリー ケビン, 足立 真寛, 山本 喜之, 竹内 恒博
  • Organizer: 第66回応用物理学会春季学術講演会（東京工業大学 大岡山キャンパス，2019/3/9）
• [Presentation] CePd3の熱電特性における元素置換効果 (2018)
  • Author(s): 尾川 史武, 松波 雅治, 竹内 恒博
  • Organizer: 第66回応用物理学会春季学術講演会（東京工業大学 大岡山キャンパス，2019/3/9）
• [Presentation] 高性能熱電材料開発における放射光の利用 (2018)
  • Author(s): 竹内 恒博
  • Organizer: 第8回名古屋大学シンクロトロン光研究センターシンポジウム（名古屋大学, 2019/1/17）
  • Invited
• [Presentation] Cu2Seで観測される異常ゼーベック効果と巨大な出力因子(無次元性能指数) (2018)
  • Author(s): 竹内 恒博
  • Organizer: 第一回プレ戦略研究会「次世代物質・デバイス戦略開発拠点」, 第一回TIAかけはし研究会「温度変化で発電するモバイル発電器」（筑波大学，2018/11/26）
  • Invited
• [Presentation] 省エネルギー社会の構築に寄与する革新的熱利用材料・素子の研究 (2018)
  • Author(s): 竹内恒博
  • Organizer: グリーン電子素子・材料研究センター 最終年度シンポジウム（豊田工業大学，2018/11/2）
  • Invited
• [Presentation] Effects of Grain Boundaries and Impurities on Thermal Conductivity (2018)
  • Author(s): 崔 城豪、松波雅治、竹内恒博
  • Organizer: グリーン電子素子・材料研究センター 最終年度シンポジウム（豊田工業大学，2018/11/2）
• [Presentation] Colossal Seebeck Effect in Cu2-δSe (2018)
  • Author(s): Dogyun Byeon, Robert Sobota, Masaharu Matsunami, Tsunehiro Takeuchi
  • Organizer: グリーン電子素子・材料研究センター 最終年度シンポジウム（豊田工業大学，2018/11/2）
• [Presentation] 銅カルコゲナイドで観測される巨大出力因子 (2018)
  • Author(s): 竹内恒博，邉韜均，Robert Sobota
  • Organizer: 粉体粉末冶金協会平成30年度秋季大会（第122回講演会）（朱鷺メッセ，新潟，2018/10/30）
• [Presentation] Si-Ge系高性能バルク熱電材料の開発 (2018)
  • Author(s): 竹内 恒博，Swapnil Ghodke，Muthusamy Omprakash，足立 真寛，山本 喜之
  • Organizer: 粉体粉末冶金協会平成30年度秋季大会（第122回講演会）（朱鷺メッセ，新潟，2018/10/30）
• [Presentation] Electron and heat transport properties in solid materials (2018)
  • Author(s): Tsunehiro Takeuchi
  • Organizer: OIST Seminar (2018/10/24, OIST, Okinawa)
  • Invited
• [Presentation] Self-tuning carrier concentration effect and colossal value of ZT in Cu2Se (2018)
  • Author(s): Tsunehiro Takeuchi
  • Organizer: Russian Conference on Thermoelectrics and their Applications RCT 2018 (2018/10/10, Sankt Peterburg, Russia)
  • Int'l Joint Research / Invited
• [Presentation] Cu2-δSeにおける自己キャリア濃度調整効果 (2018)
  • Author(s): 竹内 恒博，邉 韜均，崔 城豪，ロバート ソボタ，ケビン デリムコドリー，松波 雅治，足立 真寛，木山 誠，松浦 尚，山本 喜之
  • Organizer: 第79回応用物理学会秋季学術講演会（名古屋国際会議場，2018/9/21）(注目講演)
• [Presentation] Distictive thermoelectric properties of P doped SiGe (2018)
  • Author(s): Swapnil Chetan Ghodke，Omprakash Muthusamy，Kevin Delime Codrin，Saurabh Singh，Masahiro Adachi，Tsunehiro Takeuchi
  • Organizer: 第79回応用物理学会秋季学術講演会（名古屋国際会議場，2018/9/21）
• [Presentation] Heavy-element dependence of thermoelectric properties in Fe2VAl thin films (2018)
  • Author(s): Seongho Choi，Satoshi Hiroi，Dogyun Byeon，Masaharu Matsunami，Tsunehiro Takeuchi
  • Organizer: 第79回応用物理学会秋季学術講演会（名古屋国際会議場，2018/9/20）
• [Presentation] ZnOナノ粒子添加によるZn4Sb3の熱電性能向上 (2018)
  • Author(s): 松浦 佑哉，佐藤 敦武，田橋 正浩，高橋 誠，後藤 英雄，崔 城豪，竹内 恒博
  • Organizer: 第79回応用物理学会秋季学術講演会（名古屋国際会議場，2018/9/19）
• [Presentation] High improvement of the figure of merit ZT in bulk amorphous-nanocrystalline Si0.55Ge0.35(Fe1,P0.10) (2018)
  • Author(s): Kevin Delime，Muthusamy Omprakash，Ghodke Swapnil，Tsunehiro Takeuchi
  • Organizer: 第79回応用物理学会秋季学術講演会（名古屋国際会議場，2018/9/19）
• [Presentation] Cu2-δSe における自己キャリア濃度調整効果 (2018)
  • Author(s): 竹内恒博, 邉韜均，崔城豪，Robert Sobota，Kevin Delime-Codrin，松波雅治，足立真寛，木山誠，松浦尚，山本喜之
  • Organizer: 第15回日本熱電学会学術講演会（TSJ2018）（東北大学，青葉山キャンパス，2018/9/13）
• [Presentation] Thermoelectric properties of heavily doped semicrystalline SiGe-P compounds (2018)
  • Author(s): Swapnil Ghodke, Omprakash Muthusamy, Kevin Delime-Codrin, Saurabh Singh, Tsunehiro Takeuchi, Masahiro Adachi, Yoshiyuki Yamamoto
  • Organizer: 第15回日本熱電学会学術講演会（TSJ2018）（東北大学，青葉山キャンパス，2018/9/13）
• [Presentation] Thermal conductivity of Ta doped Fe2VAl/(Mo,W) superlattice thin films (2018)
  • Author(s): Seongho Choi, Satoshi Hiroi, Shunsuke Nishino, Manabu Inukai, Okkyun Seo, Jae Myung Kim, Dogyun Byeon, Masashi Mikami, Masaharu Matsunami, Tsunehiro Takeuchi
  • Organizer: 第15回日本熱電学会学術講演会（TSJ2018）（東北大学，青葉山キャンパス，2018/9/13）
• [Presentation] The decreases of the lattice thermal conductivity of the FeV0.955-xHf0.045TixSb half-Heusler phases (2018)
  • Author(s): Kevin Delime-Codrin, Tsunehiro Takeuchi, Swapnil Ghodke, Dogyun Byeon
  • Organizer: The 37th | 16th International & European Conference on Thermoelectrics (ICT/ECT 2018) (Caen, France, 2018/7/5)
  • Int'l Joint Research
• [Presentation] Effect of element substitution on the phase stability of complex MnSiγ (2018)
  • Author(s): Swapnil Ghodke, Robert Sobota, David Berthebaud, Pierre-Yves Pichon, Christelle Navone, T. Takeuchi
  • Organizer: The 37th | 16th International & European Conference on Thermoelectrics (ICT/ECT 2018) (Caen, France, 2018/7/4)
  • Int'l Joint Research
• [Presentation] Thermal conductivity of Fe2VAl-based superlattice thin film (2018)
  • Author(s): S. Choi, S. Hiroi, S. Nishino, M. Inukai, O. Seo, J. M. Kim, D. Byeon, M. Mikami, M. Matsunami, and T. Takeuchi
  • Organizer: The 37th | 16th International & European Conference on Thermoelectrics (ICT/ECT 2018) (Caen, France, 4th, 2018/7/4)
  • Int'l Joint Research
• [Presentation] Self-tuning carrier concentration effect of noble metal chalcogenides (2018)
  • Author(s): Dogyun Byeon, Robert Sobota, Kevin Delime-Codrin, Seongho Choi, Keisuke Hirata, Masahiro Adachi, Makoto Kiyama, Yoshiyuki Yamamoto, Takashi Matsuura, Masaharu Matsunami, Tsunehiro Takeuchi
  • Organizer: The 37th | 16th International & European Conference on Thermoelectrics (ICT/ECT 2018) (Caen, France, 2018/7/2)
  • Int'l Joint Research