Materials Science and Engineering
Laboratory name
Energy Materials Laboratory   
Laboratory staff
Tsunehiro Takeuchi （Professor） 　 Masaharu Matsunami （Professor） 　 ANG, Artoni Kevin Roquero （Commissioned Researcher） SAMINATHAN Madhuvathani （Post Doctoral Fellow） 　 CHANDRASEKAR Prasana Suresh （Post Doctoral Fellow） 　 PRIYANKA （Post Doctoral Fellow） 　 ARORA, Hemant （Post Doctoral Fellow） 　
Laboratory title
Development of functional materials contributing the construction of low-energy-consuming, sustainable, carbon neutral society
Laboratory overview
By precisely analyzing energy, momentum, spin polarization, and lattice vibrations using various experimental techniques and theoretical calculations, we aim to develop functional materials capable of being contributing the construction of low-energy-consuming, sustainable, carbon neutral society.
Main research themes
・Development of environmentally friendly thermoelectric materials
・Development of heat flow managing materials and devices
・Electronic structure and electron transport properties of high-Tc superconductors
・Electronic properties of strong electron correlation systems
Individual research theme

  • Development of high performance thermal diodes and heat flowswitching devices

    竹内　恒博

    2017

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    Outcome：

    2024
    By utilizing latent heat at the structural phase transition of Ag2(S, Se, Te), we successfully developed a new type of thermal rectification device.

    2023
    By employing electric double layer type capacitor structure, we succeeded in developing a heat flow switching device capable of instantly changing heat flow within a second. The switching ratio Jq1/Jq2 exceeded 2.5.

    2022
    We found that a strong magneto-thermalconductivivty effect was observable for Ag2Te to be used in heat switching devices.

    2022
    We revealed that the lattice thermal conductivity was significantly reduced by anharmonic lattice vibrations and band edge effect in electronic thermal conductivity in Ag2S1-xSex (0≤ x≤ 0.6).

  • Development of high performance thermoelectric materials based on heavy fermion systems

    松波　雅治, 竹内　恒博

    2017

  • Study for electronic structure near Fermi level in valence fluctuating quasicrystals

    松波　雅治, 竹内　恒博

    2017 - 2019

  • Development of Bulk Thermoelectric Materials Possessing ZT > 3.0

    竹内　恒博

    2022

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    Outcome：

    2024
    A new strategy for effectively enhancing thermoelectric properties has been proposed.

    2023
    The problem about oxidization were eliminated by employing oxygen getter material during the sintering process, and the SI-Ge nano-bulk thermoelectric materials possessing dimensions figure of merit ZT > 5.0 was successfully developed.

    2022
    Electronic structure of silver chalcogenides investigated by hard x-ray photoemission spectroscopy and density functional theory calculations

  • 角度分解光電子分光を用いた熱電特性の支配因子に関する研究

    松波　雅治, 竹内　恒博

    2024

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    熱電材料の開発・高性能化にブレイクスルーをもたらすと考えられている固体内での電子散乱の影響を可視化するために角度分解光電子分光を用いた方法論を開発する．

    Outcome：

    2024
    強相関Yb化合物に対する角度分解光電子分光の結果から熱電特性に対する準粒子の緩和時間のエネルギー依存性を評価することに成功した．

    2025
    強相関Yb化合物に対する角度分解光電子分光の結果から熱電特性の支配因子を特定することに成功した．

  • 強相関層状化合物における異方的熱電特性の起源に関する研究

    松波　雅治

    2025

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    強相関層状化合物においては，電子状態の異方性を制御することで熱電特性の高性能化が期待できる．本研究では，強相関層状化合物の大型単結晶試料を作製し，熱電特性の異方性の起源を特定する．

    Outcome：

    2025
    典型的なCe化合物に関して大型単結晶の作製に成功し，熱電特性の顕著な異方性を観測した．