Creation of Solid-State Thermal Transistor

• Project/Area Number: 22H00253
• Research Category: Grant-in-Aid for Scientific Research (A)
• Allocation Type: Single-year Grants
• Section: 一般
• Review Section: Medium-sized Section 26:Materials engineering and related fields
• Research Institution: Hokkaido University
• Principal Investigator: 太田 裕道 北海道大学, 電子科学研究所, 教授 (80372530)
• Project Period (FY): 2022-04-01 – 2026-03-31
• Project Status: Granted (Fiscal Year 2025)
• Budget Amount: ¥42,380,000 (Direct Cost: ¥32,600,000、Indirect Cost: ¥9,780,000); Fiscal Year 2025: ¥8,970,000 (Direct Cost: ¥6,900,000、Indirect Cost: ¥2,070,000); Fiscal Year 2024: ¥8,970,000 (Direct Cost: ¥6,900,000、Indirect Cost: ¥2,070,000); Fiscal Year 2023: ¥8,970,000 (Direct Cost: ¥6,900,000、Indirect Cost: ¥2,070,000); Fiscal Year 2022: ¥15,470,000 (Direct Cost: ¥11,900,000、Indirect Cost: ¥3,570,000)
• Keywords: 全固体熱トランジスタ / 熱スイッチ / 熱トランジスタ

Outline of Research at the Start

本研究では、「固体電解質と遷移金属酸化物からなる全固体熱トランジスタ」を創製する。具体的には、上部電極／遷移金属酸化物／固体電解質／下部電極からなる積層構造を作製し、電圧印加によって起こる遷移金属酸化物の酸化・還元による結晶構造変化と、それに伴う大きな熱伝導率変化を利用することで、高熱伝導率状態と低熱伝導率状態を繰り返し制御可能な全固体熱トランジスタを実現する。なお、全固体熱トランジスタはこれまでに実現されたことがなく、本研究で世界初の全固体熱トランジスタの実現を目指す。

Outline of Annual Research Achievements

本研究では、「固体電解質と遷移金属酸化物からなる全固体熱トランジスタ」の実現を目指している。具体的には、上部電極／遷移金属酸化物／固体電解質／下部電極からなる積層構造を作製し、電圧印加によって起こる遷移金属酸化物の酸化・還元による結晶構造変化と、それに伴う大きな熱伝導率変化を利用することで、高熱伝導率状態と低熱伝導率状態を繰り返し制御可能な全固体熱トランジスタを実現する。

1年目（2022年度）：熱の伝わり方を電気スイッチで切り替える全固体電気化学熱トランジスタを世界で初めて実現した（Adv. Funct. Mater. 掲載）。米国の研究者が電解液やイオン液体などの「液体」を用いた熱トランジスタを開発していたが、本研究で全固体化できたことのインパクトは極めて大きいと考えている。

2年目（2023年度）：全固体熱トランジスタの高性能化を目指した研究を行い、①高電気伝導性の活性層を用いることが重要であることを見出し（ACS Appl. Mater. Interfaces掲載）、②固体電解質として使用するYSZ単結晶板の厚さを薄くすることで動作電圧の低減・高速化に成功した（ACS Appl. Electron. Mater.掲載）。また、③活性層をLaNiO3で置き換えることにより、熱伝導率制御幅の改善にも成功した（Adv. Sci.審査中）。さらに、④新たな材料探索指針に基づき活性層を探索し、従来の熱伝導率制御幅を二倍以上の全固体熱トランジスタを実現した（論文執筆中）。

Current Status of Research Progress

1: Research has progressed more than it was originally planned.

Reason

当初計画では3年間で全固体熱トランジスタの実現、特性改良を行うこととしていたが、大幅に前倒しし、2年間で従来の液体を利用する熱トランジスタの性能を二倍以上上回る高性能全固体熱トランジスタの試作に成功した。

Strategy for Future Research Activity

2年目に実現した従来の熱伝導率制御幅を二倍以上上回る全固体熱トランジスタをスケールアップするための基礎的な研究を行い論文発表するとともに、スケールアップして実際の熱のディスプレイを試作することにより、実用化の際の問題点を抽出する。また、米国の研究者に追いつかれないように、次年度以降の研究展開を見据え、最終年度前年度応募（基盤研究(S)）を行う予定である。

Research Products

• [Int'l Joint Research] 江蘇大学(中国)
• [Int'l Joint Research] 釜山大学校/成均館大学校(韓国)
• [Int'l Joint Research] 北京交通大学/江蘇大学(中国)
• [Int'l Joint Research] 釜山大学校/成均館大学校(韓国)
• [Journal Article] High-mobility rutile SnO₂ epitaxial films grown on (1−100) α-Al₂O₃ (2023)
  • Author(s): Binjie Chen, Jinghuang Lin, Bin Feng, Yuichi Ikuhara, Hiromichi Ohta
  • Journal Title: Journal of the Ceramic Society of Japan Volume: 131 Issue: 10 Pages: 640-644
  • DOI: 10.2109/jcersj2.23035
  • ISSN: 1348-6535, 1882-0743
  • Year and Date: 2023-10-01
  • Peer Reviewed / Open Access
• [Journal Article] Suppression of Strain Relaxation in VO2/TiO2 Multilayered Films (2023)
  • Author(s): Binjie Chen, Chuchu Yang, Bin Feng, Yuichi Ikuhara, Hiromichi Ohta
  • Journal Title: ACS Applied Electronic Materials Volume: 5 Issue: 4 Pages: 2433-2438
  • DOI: 10.1021/acsaelm.3c00246
  • Peer Reviewed
• [Journal Article] Solid-State Electrochemical Thermal Transistors with Strontium Cobaltite - Strontium Ferrite Solid Solutions as the Active Layers (2023)
  • Author(s): Zhiping Bian, Qian Yang, Mitsuki Yoshimura, Hai Jun Cho, Joonhyuk Lee, Hyoungjeen Jeen, Takashi Endo, Yasutaka Matsuo, Hiromichi Ohta
  • Journal Title: ACS Appl. Mater. Interfaces Volume: 15 Issue: 19 Pages: 23512-23517
  • DOI: 10.1021/acsami.3c03660
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Significant Reduction in the Switching Time of Solid-State Electrochemical Thermal Transistors (2023)
  • Author(s): Mitsuki Yoshimura, Qian Yang, Zhiping Bian, Hiromichi Ohta
  • Journal Title: ACS Appl. Electron. Mater. Volume: 5 Issue: 8 Pages: 4233-4239
  • DOI: 10.1021/acsaelm.3c00512
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Fabrication and Thermoelectric Properties of Freestanding Ba1/3CoO2 Single Crystalline Films (2023)
  • Author(s): Kungwan Kang, Fumiaki Kato, Akitoshi Nakano, Ichiro Terasaki, Takashi Endo, Yasutaka Matsuo, Hyoungjeen Jeen, Hiromichi Ohta
  • Journal Title: ACS Appl. Electron. Mater. Volume: 5 Issue: 10 Pages: 5749-5754
  • DOI: 10.1021/acsaelm.3c01129
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Improved Electron Transport Properties of Zn-Rich In?Ga?Zn?O Thin-Film Transistors (2023)
  • Author(s): Ghediya Prashant、Yang Hui、Fujimoto Takashi、Zhang Yuqiao、Matsuo Yasutaka、Magari Yusaku、Ohta Hiromichi
  • Journal Title: The Journal of Physical Chemistry C Volume: 127 Issue: 5 Pages: 2622-2627
  • DOI: 10.1021/acs.jpcc.2c07442
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Solid‐State Electrochemical Thermal Transistors (2023)
  • Author(s): Yang Qian、Cho Hai Jun、Bian Zhiping、Yoshimura Mitsuki、Lee Joonhyuk、Jeen Hyoungjeen、Lin Jinghuang、Wei Jiake、Feng Bin、Ikuhara Yuichi、Ohta Hiromichi
  • Journal Title: Advanced Functional Materials Volume: - Issue: 19 Pages: 2214939-2214939
  • DOI: 10.1002/adfm.202214939
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Ba1/3CoO2: A Thermoelectric Oxide Showing a Reliable ZT of ~0.55 at 600 °C in Air (2022)
  • Author(s): Xi Zhang, Yuqiao Zhang, Liao Wu, Akihiro Tsuruta, Masashi Mikami, Hai Jun Cho, Hiromichi Ohta
  • Journal Title: ACS Appl. Mater. Interfaces Volume: 14 Issue: 29 Pages: 33355-33360
  • DOI: 10.1021/acsami.2c08555
  • Peer Reviewed
• [Journal Article] Thermopower Modulation Analyses of High-Mobility Transparent Amorphous Oxide Semiconductor Thin-Film Transistors (2022)
  • Author(s): Yang Hui、Zhang Yuqiao、Matsuo Yasutaka、Magari Yusaku、Ohta Hiromichi
  • Journal Title: ACS Applied Electronic Materials Volume: 4 Issue: 10 Pages: 5081-5086
  • DOI: 10.1021/acsaelm.2c01210
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Orthorhombic distortion-induced anatase-like optoelectronic properties of rutile TiO2 (2022)
  • Author(s): Chen Binjie、Kang Kungwan、Jeen Hyoungjeen、Zhang Yuqiao、Lin Jinghuang、Feng Bin、Ikuhara Yuichi、Hoshino Sena、Matsunaga Katsuyuki、Ohta Hiromichi
  • Journal Title: Journal of Applied Physics Volume: 132 Issue: 18 Pages: 185301-185301
  • DOI: 10.1063/5.0119725
  • Peer Reviewed / Int'l Joint Research
• [Presentation] LaNiO3薄膜を活性層とする全固体熱トランジスタの作製 (2024)
  • Author(s): 吉村充生, 李 好博, 卞 志平, ジョンアロン, 曲 勇作, 田中秀和, 太田裕道
  • Organizer: 第59回 応用物理学会北海道支部 / 第20回 日本光学会北海道支部 合同学術講演会
• [Presentation] 大きな熱伝導率変化幅を示すCeO2全固体電気化学熱トランジスタ (2024)
  • Author(s): ジョンアロン, 卞 志平, 吉村充生, フウビン, 幾原雄一, 曲 勇作, 太田裕道
  • Organizer: 2024年 第71回 応用物理学会春季学術講演会
• [Presentation] 高電子熱伝導率LaNiO3薄膜を活性層とする全固体熱トランジスタの作製 (2024)
  • Author(s): 吉村充生, 李 好博, 卞 志平, ジョンアロン, 曲 勇作, 田中秀和, 太田裕道
  • Organizer: 2024年 第71回 応用物理学会春季学術講演会
• [Presentation] Solid-State Electrochemical Thermal Transistors with Large Thermal Conductivity Switching Widths (2024)
  • Author(s): Zhiping Bian, Mitsuki Yoshimura, Ahrong Jeong, Haobo Li, Takashi Endo, Yasutaka Matsuo, Yusaku Magari, Hidekazu Tanaka, Hiromichi Ohta
  • Organizer: 2024年 第71回 応用物理学会春季学術講演会
• [Presentation] CeO2薄膜の電気化学酸化・還元-熱トランジスタの高性能化に向けて- (2024)
  • Author(s): ジョンアロン, 卞 志平, 吉村充生, フウビン, 幾原雄一, 曲 勇作, 太田裕道
  • Organizer: 2024年 第71回 応用物理学会春季学術講演会
• [Presentation] Film Growth of Functional Oxide Thin Films and Their Applications towards Optoelectronics and Thermoelectrics (2023)
  • Author(s): Hiromichi Ohta
  • Organizer: Lecture at Jiangsu University
  • Int'l Joint Research / Invited
• [Presentation] 全固体電気化学熱トランジスタ：遷移金属酸化物の熱伝導率を電気的に切替える固体スイッチ (2023)
  • Author(s): 太田裕道
  • Organizer: 第84回 応用物理学会秋季学術講演会
  • Invited
• [Presentation] SrCoOx-based solid-state electrochemical thermal transistors (2023)
  • Author(s): Hiromichi Ohta
  • Organizer: International Conference on Condensed Matter and Device Physics (ICCMDP-2023)
  • Int'l Joint Research / Invited
• [Presentation] Functional oxide thin film growth and application -An introduction- (2023)
  • Author(s): Hiromichi Ohta
  • Organizer: Global Scholar Seminar for Emerging Semiconductor, Emerging Display, Automobile, and Energy
  • Int'l Joint Research / Invited
• [Presentation] A thermoelectric oxide, Ba1/3CoO2 (2023)
  • Author(s): Hiromichi Ohta
  • Organizer: 14th ISAJ Annual Symposium (Integrated Science for a Sustainable Society)
  • Int'l Joint Research / Invited
• [Presentation] Solid-State Electrochemical Thermal Transistors (2023)
  • Author(s): Hiromichi Ohta
  • Organizer: MRM2023/IUMRS-ICA2023 (Symposium A-4)
  • Int'l Joint Research / Invited
• [Presentation] Thermal Conductivity Modulation of SrCoOy-SrFeOy Solid Solution in Solid-State Electrochemical Thermal Transistors (2023)
  • Author(s): Zhiping Bian, Qian Yang, Mitsuki Yoshimura, Hai Jun Cho, Joonhyuk Lee, Hyoungjeen Jeen, Takashi Endo, Yasutaka Matsuo, Hiromichi Ohta
  • Organizer: The 4th Workshop on Functional Materials Science (FMS2023)
  • Int'l Joint Research
• [Presentation] Reduction of the Electrical Resistance of Solid-State Electrochemical Thermal Transistors (2023)
  • Author(s): Mitsuki Yoshimura, Qian Yang, Zhiping Bian, Hai Jun Cho, Hiromichi Ohta
  • Organizer: The 4th Workshop on Functional Materials Science (FMS2023)
  • Int'l Joint Research
• [Presentation] Absence of High On-to-Off Thermal Conductivity Ratio in the LaxSr1-xCoOy-based Thermal Transistors (2023)
  • Author(s): Zhiping Bian, Mitsuki Yoshimura, Ahrong Jeong, Hiromichi Ohta
  • Organizer: 第84回 応用物理学会秋季学術講演会
• [Presentation] SrCoOx/YSZ-based Solid-State Electrochemical Thermal Transistors (2023)
  • Author(s): Hiromichi Ohta, Qian Yang, Hai Jun Cho, Zhiping Bian, Mitsuki Yoshimura, Joonhyuk Lee, Hyoungjeen Jeen, Jinghuang Lin, Jiake Wei, Bin Feng, Yuichi Ikuhara
  • Organizer: 29th International Workshop on Oxide Electronics (iWOE29)
  • Int'l Joint Research
• [Presentation] Solid-State Electrochemical Thermal Transistors with Perovskite Cobalt Oxide-based Solid Solutions as the Active Layers (2023)
  • Author(s): Zhiping Bian, Mitsuki Yoshimura, Qian Yang, Hai Jun Cho, Joonhyuk Lee, Hyoungjeen Jeen, Takashi Endo, Yasutaka Matsuo, Hiromichi Ohta
  • Organizer: 29th International Workshop on Oxide Electronics (iWOE29)
  • Int'l Joint Research
• [Presentation] Thermal Conductivity Modulation in Sr1-xBaxCoOy Epitaxial Films (2023)
  • Author(s): Ahrong Jeong, Zhiping Bian, Mitsuki Yoshimura, Hiromichi Ohta
  • Organizer: 29th International Workshop on Oxide Electronics (iWOE29)
  • Int'l Joint Research
• [Presentation] 全固体電気化学熱トランジスタの開発 (2023)
  • Author(s): 太田裕道, 楊 倩, Hai Jun Cho, Zhiping Bian, 吉村充生, Joonhyuk Lee, Hyoungjeen Jeen, Jinghuang Lin, Jiake Wei, Bin Feng, 幾原雄一
  • Organizer: 第49回固体イオニクス討論会
• [Presentation] Solid-State Electrochemical Thermal Transistors with Alkaline Earth-ion substituted Strontium Cobaltite Films (2023)
  • Author(s): Ahrong Jeong, Zhiping Bian, Mitsuki Yoshimura, Hiromichi Ohta
  • Organizer: 第49回固体イオニクス討論会
• [Presentation] LnNiO3（Ln = La, Pr, Nd, Sm）エピタキシャル薄膜の熱伝導率-全固体熱トランジスタの活性層探索- (2023)
  • Author(s): 吉村充生, 卞志平, ジョンアロン, 太田裕道
  • Organizer: 第49回固体イオニクス討論会
• [Presentation] Alkaline earth-ion substituted strontium cobaltite films as solid-state electrochemical thermal transistors (2023)
  • Author(s): Ahrong Jeong, Zhiping Bian, Mitsuki Yoshimura, Hiromichi Ohta
  • Organizer: The Mini-Workshop on Functional Materials Science (Organizers’ meeting)
  • Int'l Joint Research
• [Presentation] Thermal conductivity of LnNiO3 (Ln = La, Pr, Nd, and Sm) epitaxial films (2023)
  • Author(s): Mitsuki Yoshimura, Haobo Li, Zhiping Bian, Ahrong Jeong, Yusaku Magari, Hidekazu Tanaka, Hiromichi Ohta
  • Organizer: The Mini-Workshop on Functional Materials Science (Organizers’ meeting)
  • Int'l Joint Research
• [Presentation] Solid-state electrochemical thermal transistors with perovskite cobalt oxide-based solid solutions as the active layers (2023)
  • Author(s): Zhiping Bian, Mitsuki Yoshimura, Qian Yang, Hai Jun Cho, Joonhyuk Lee, Hyoungjeen Jeen, Takashi Endo, Yasutaka Matsuo, Hiromichi Ohta
  • Organizer: The Mini-Workshop on Functional Materials Science (Organizers’ meeting)
  • Int'l Joint Research
• [Presentation] Alkaline Earth-ion Substituted Strontium Cobaltite Films as Solid-State Electrochemical Thermal Transistors (2023)
  • Author(s): Ahrong Jeong, Zhiping Bian, Mitsuki Yoshimura, Hiromichi Ohta
  • Organizer: The 24th RIES-HOKUDAI International Symposium 開 [kai]
  • Int'l Joint Research
• [Presentation] Solid-State Electrochemical Thermal Transistors with Perovskite Cobaltate-based Solid Solutions as the Active Layers (2023)
  • Author(s): Zhiping Bian, Mitsuki Yoshimura, Qian Yang, Hai Jun Cho, Joonhyuk Lee, Hyoungjeen Jeen, Takashi Endo, Yasutaka Matsuo, Hiromichi Ohta
  • Organizer: The 24th RIES-HOKUDAI International Symposium 開 [kai]
  • Int'l Joint Research
• [Presentation] Thermal Conductivity of LnNiO3 (Ln = La, Pr, Nd, and Sm) Epitaxial Films -Towards High Performance Solid-State Electrochemical Thermal Transistors- (2023)
  • Author(s): Mitsuki Yoshimura, Haobo Li, Zhiping Bian, Ahrong Jeong, Yusaku Magari, Hidekazu Tanaka, Hiromichi Ohta
  • Organizer: The 24th RIES-HOKUDAI International Symposium 開 [kai]
  • Int'l Joint Research
• [Presentation] Solid-State Electrochemical Thermal Transistors with Perovskite Cobalt Oxide-based Solid Solutions as the Active Layers (2023)
  • Author(s): Zhiping Bian, Mitsuki Yoshimura, Qian Yang, Hai Jun Cho, Joonhyuk Lee, Hyoungjeen Jeen, Takashi Endo, Yasutaka Matsuo, Hiromichi Ohta
  • Organizer: The 2023 RIES-CEFMS Joint International Symposium
  • Int'l Joint Research
• [Presentation] Thermal Conductivity of RNiO3 (R = La, Nd, Pr, and Sm) Epitaxial Films (2023)
  • Author(s): Mitsuki Yoshimura, Zhiping Bian, Ahrong Jeong, Hiromichi Ohta
  • Organizer: The 2023 RIES-CEFMS Joint International Symposium
  • Int'l Joint Research
• [Presentation] Absence of High On-to-Off Thermal Conductivity Ratio in the LaxSr1-xCoOy-based Thermal Transistors (2023)
  • Author(s): Zhiping Bian, Mitsuki Yoshimura, Ahrong Jeong, Hiromichi Ohta
  • Organizer: MRM2023
  • Int'l Joint Research
• [Presentation] Significant Reduction in the Switching Time of Solid-State Electrochemical Thermal Transistors (2023)
  • Author(s): Mitsuki Yoshimura, Qian Yang, Zhiping Bian, Hiromichi Ohta
  • Organizer: MRM2023
  • Int'l Joint Research
• [Presentation] Orthorhombic Distortion Induced Insulator-to-Metal Transition Behavior of VO2/TiO2 Bilayer Films on (1-100) α-Al2O3 (2023)
  • Author(s): Binjie Chen, Gowoon Kim, Hai Jun Cho, Hiromichi Ohta
  • Organizer: 7th International Conference on Advances in Functional Materials (AFM 2023)
  • Int'l Joint Research
• [Presentation] Ba1/3CoO2: A Thermoelectric Oxide Showing a Reliable ZT of ~0.55 at 600 °C in Air (2023)
  • Author(s): Xi Zhang, Yuqiao Zhang, Liao Wu, Akihiro Tsuruta, Masashi Mikami, Hai Jun Cho, Hiromichi Ohta
  • Organizer: 7th International Conference on Advances in Functional Materials (AFM 2023)
  • Int'l Joint Research
• [Presentation] Electric Field Thermopower Modulation Analyses of High Mobility In-Sn-Zn-O Thin Film Transistors (2023)
  • Author(s): Hui Yang, Yuqiao Zhang, Yasutaka Matsuo, Hiromichi Ohta
  • Organizer: 7th International Conference on Advances in Functional Materials (AFM 2023)
  • Int'l Joint Research
• [Presentation] Faster Operation of SrCoOx-based Solid-State Electrochemical Thermal Transistors (2023)
  • Author(s): Mitsuki Yoshimura, Qian Yang, Zhiping Bian, Hai Jun Cho, Hiromichi Ohta
  • Organizer: 7th International Conference on Advances in Functional Materials (AFM 2023)
  • Int'l Joint Research
• [Presentation] Electric Field Thermopower Modulation Analyses of the Operation Mechanism of Amorphous InGaO3(ZnO)m Thin Film Transistors (2023)
  • Author(s): Prashant R. Ghediya, Hui Yang, Takashi Fujimoto, Yuqiao Zhang, Yasutaka Matsuo, Hiromichi Ohta
  • Organizer: 7th International Conference on Advances in Functional Materials (AFM 2023)
  • Int'l Joint Research
• [Presentation] Solid-state Electrochemical Thermal Transistors using SrCoOy-SrFeOy Solid Solutions (2023)
  • Author(s): Zhiping Bian, Qian Yang, Mitsuki Yoshimura, Hai Jun Cho, Hiromichi Ohta
  • Organizer: 7th International Conference on Advances in Functional Materials (AFM 2023)
  • Int'l Joint Research
• [Presentation] 全固体電気化学熱トランジスタ (2023)
  • Author(s): 楊 倩，ジョヘジュン，卞 志平, 吉村充生, イジュンヤク，ジンヒョンジン, 林 景煌, 魏 家科, 馮 斌, 幾原雄一, 太田裕道
  • Organizer: 第70回 応用物理学会 春季学術講演会
• [Presentation] 全固体熱トランジスタ特性に及ぼす固体電解質厚さの影響 (2023)
  • Author(s): 吉村充生，楊 倩, 卞 志平, ジョへジュン, 太田裕道
  • Organizer: 第70回 応用物理学会 春季学術講演会
• [Presentation] 全固体電気化学熱トランジスタの活性層Ⅰ: SrCoOx-SrFeOx固溶体 (2023)
  • Author(s): 卞 志平，楊 倩，吉村充生，イジュンヤク，ジンヒョンジン, 林 景煌, 馮 斌, 幾原雄一, ジョヘジュン, 太田裕道
  • Organizer: 第70回 応用物理学会 春季学術講演会
• [Presentation] 全固体電気化学熱トランジスタの活性層Ⅱ: SrCoOx-SrRuOx固溶体 (2023)
  • Author(s): 卞 志平，太田裕道
  • Organizer: 第70回 応用物理学会 春季学術講演会
• [Presentation] 高背圧下PLDにより作製した高移動度In2O3薄膜を活性層とするTFT (2023)
  • Author(s): ゲディアプラシャント, 曲 勇作, 楊 卉, 張 雨橋, 松尾保孝, 太田裕道
  • Organizer: 第70回 応用物理学会 春季学術講演会
• [Presentation] 強誘電体HfO2-ZrO2ゲート透明InSnZnOx薄膜メモリー (2023)
  • Author(s): 楊 卉，Prashant Ghediya，張 雨橋，松尾保孝，曲 勇作，太田裕道
  • Organizer: 第70回 応用物理学会 春季学術講演会
• [Presentation] Thermoelectric Properties of Conducting Oxide Thin Films (2022)
  • Author(s): Hiromichi Ohta
  • Organizer: Physics Seminar in Pusan National University
  • Int'l Joint Research / Invited
• [Presentation] Thermoelectric Oxide Thin Films (2022)
  • Author(s): Hiromichi Ohta
  • Organizer: 2022 Asian Conference on Nanoscience & Nanotechnology (AsiaNANO 2022)
  • Int'l Joint Research / Invited
• [Presentation] Solid-State Electrochemical Control of Oxygen Contents in Transition Metal Oxide Thin Films with Perovskite-Related Crystal Structure (2022)
  • Author(s): Hiromichi Ohta, Qian Yang, Gowoon Kim, and Xi Zhang,
  • Organizer: 2022 MRS Spring Meeting & Exhibit
  • Int'l Joint Research
• [Presentation] Ba1/3CoO2: 空気中，600Cで信頼できるZT ~0.55を示す熱電酸化物 (2022)
  • Author(s): 張 習, 張 雨橋, 呉 礼奥, 鶴田彰宏, 三上祐史, ジョヘジュン, 太田裕道,
  • Organizer: 第19回 日本熱電学会学術講演会
• [Presentation] Optoelectronic Properties of Orthorhombic-Distorted Nb:TiO2 Films (2022)
  • Author(s): Binjie Chen, Yuqiao Zhang, Katsuyuki Matsunaga, and Hiromichi Ohta,
  • Organizer: The 22nd International Vacuum Congress (IVC-22)
  • Int'l Joint Research
• [Presentation] Ba1/3CoO2: 空気中，600 °Cで信頼できるZT ~0.55を示す熱電酸化物 (2022)
  • Author(s): 張 習, 張 雨橋, 呉 礼奥, 鶴田彰宏, 三上祐史, ジョヘジュン, 太田裕道,
  • Organizer: 2022年 第83回 応用物理学会秋季学術講演会
• [Presentation] VO2/TiO2多層膜の段階的絶縁体/金属転移 (2022)
  • Author(s): 陳 斌杰，太田裕道,
  • Organizer: 2022年 第83回 応用物理学会秋季学術講演会
• [Presentation] 高移動度InSnZnOx薄膜トランジスタの熱電能電界変調 (2022)
  • Author(s): 楊 卉，張 雨橋, 松尾保孝, 太田裕道,
  • Organizer: 2022年 第83回 応用物理学会秋季学術講演会
• [Presentation] SrCoOx-SrFeOx固溶体薄膜の電気化学酸化・還元と熱・電子輸送特性 (2022)
  • Author(s): 卞 志平，楊 倩，吉村充生，ジョヘジュン, 太田裕道
  • Organizer: 2022年 第83回 応用物理学会秋季学術講演会
• [Presentation] Room Temperature Insulator-to-Metal Transition of Strained VO2/TiO2 Multilayered Films (2022)
  • Author(s): Binjie Chen, Jinchuan Lin, Bin Feng, Yuichi Ikuhara, Hiromichi Ohta
  • Organizer: 令和4年度日本セラミックス協会東北北海道支部研究発表会
• [Presentation] Thermopower Modulation Analyses of High-mobility InSnZnOx Thin-Film Transistors (2022)
  • Author(s): Hui Yang, Yuqiao Zhang, Yasutaka Matsuo, Yusaku Magari, Hiromichi Ohta
  • Organizer: 令和4年度日本セラミックス協会東北北海道支部研究発表会
• [Presentation] Solid-State Electrochemical Thermal Transistors based on Sr(Co1-xFex)Oy (0 < x < 1, 2 < y < 3) Films as Active Layers (2022)
  • Author(s): Zhiping Bian, Qian Yang, Mitsuki Yoshimura, Joonhyuk Lee, Hyoungjeen Jeen, Jinghuang Lin, Bin Feng, Yuichi Ikuhara, Hai Jun Cho, Hiromichi Ohta
  • Organizer: 令和4年度日本セラミックス協会東北北海道支部研究発表会
• [Presentation] 全固体熱トランジスタに及ぼす固体電解質厚さの影響 (2022)
  • Author(s): 吉村充生, 楊 倩, 卞 志平, ジョヘジュン, 太田裕道
  • Organizer: 令和4年度日本セラミックス協会東北北海道支部研究発表会
• [Presentation] Room Temperature Insulator-to-Metal Transition of Strained VO2/TiO2 Multilayered Films (2022)
  • Author(s): Binjie Chen, Hiromichi Ohta
  • Organizer: 薄膜材料デバイス研究会 第19回研究集会 in 京都
• [Presentation] Thermopower Modulation Analyses of High-mobility Transparent Amorphous Oxide Semiconductor InSnZnOx Thin-Film Transistors (2022)
  • Author(s): Hui Yang, Yuqiao Zhang, Yasutaka Matsuo, Yusaku Magari, Hiromichi Ohta
  • Organizer: 薄膜材料デバイス研究会 第19回研究集会 in 京都
• [Presentation] Solid-State Electrochemical Thermal Transistors based on Sr(Co1-xFex)Oy (0 < x < 1, 2 < y < 3) Films as Active Layers (2022)
  • Author(s): Zhiping Bian, Qian Yang, Mitsuki Yoshimura, Joonhyuk Lee, Hyoungjeen Jeen, Jinghuang Lin, Bin Feng, Yuichi Ikuhara, Hai Jun Cho, Hiromichi Ohta,
  • Organizer: 薄膜材料デバイス研究会 第19回研究集会 in 京都
• [Presentation] 全固体熱トランジスタに及ぼす固体電解質厚さの影響 (2022)
  • Author(s): 吉村充生, 楊 倩, 卞 志平, ジョヘジュン, 太田裕道
  • Organizer: 薄膜材料デバイス研究会 第19回研究集会 in 京都
• [Presentation] Room Temperature Insulator-to-Metal Transition of Strained VO2/TiO2 Multilayered Films (2022)
  • Author(s): Binjie Chen, Hiromichi Ohta
  • Organizer: The 23rd RIES-Hokudai International Symposium 拓
  • Int'l Joint Research
• [Presentation] Origin of High-Mobility in Transparent Oxide Semiconductor Thin Film Transistors toward Super High-Definition Displays (2022)
  • Author(s): Hui Yang, Yuqiao Zhang, Yasutaka Matsuo, Yusaku Magari, Hiromichi Ohta
  • Organizer: The 23rd RIES-Hokudai International Symposium 拓
  • Int'l Joint Research
• [Presentation] Low Voltage Operation of Solid-State Thermal Transistors (2022)
  • Author(s): Mitsuki Yoshimura, Qian Yang, Zhiping Bian, Hai Jun Cho, Hiromichi Ohta
  • Organizer: The 23rd RIES-Hokudai International Symposium 拓
  • Int'l Joint Research
• [Presentation] Electric Field Thermopower Modulation Analyses of Operation Mechanism of InGaO3(ZnO)m Thin Film Transistors (2022)
  • Author(s): Prashant Ghediya, Hui Yang, Takashi Fujimoto, Yuqiao Zhang, Yasutaka Matsuo, Yusaku Magari, Hiromichi Ohta
  • Organizer: The 23rd RIES-Hokudai International Symposium 拓
  • Int'l Joint Research
• [Presentation] Thermal Conductivity Modulation in SrCoOy-SrFeOy Solid Solution by Electrochemical Redox Reaction (2022)
  • Author(s): Zhiping Bian, Qian Yang, Mitsuki Yoshimura, Joonhyuk Lee, Hyoungjeen Jeen, Jinghuang Lin, Bin Feng, Yuichi Ikuhara, Hai Jun Cho, Hiromichi Ohta
  • Organizer: The 23rd RIES-Hokudai International Symposium 拓
  • Int'l Joint Research
• [Presentation] Electric Field Thermopower Modulation Analyses of Transistor Characteristics of High-mobility In-Sn-Zn-O Thin Film Transistors (2022)
  • Author(s): Hui Yang, Yuqiao Zhang, Yasutaka Matsuo, Hiromichi Ohta
  • Organizer: The 29th International Display Workshops (IDW ’22)
  • Int'l Joint Research
• [Presentation] Electric Field Thermopower Modulation Analyses of Effective Channel Thickness of Amorphous InGaO3(ZnO)m Thin Film Transistors (2022)
  • Author(s): Prashant Ghediya, Hui Yang, Takashi Fujimoto, Yuqiao Zhang, Yasutaka Matsuo, Hiromichi Ohta
  • Organizer: The 29th International Display Workshops (IDW ’22)
  • Int'l Joint Research
• [Remarks] 北海道大学 電子科学研究所 太田研究室
  • URL: https://functfilm.es.hokudai.ac.jp/
• [Remarks] 実用的な熱電材料の単結晶化に成功～毒性元素を使わない熱電変換の実現に向けて大きく前進～
  • URL: https://www.hokudai.ac.jp/news/2023/10/post-1335.html
• [Remarks] 熱伝導率を制御するトランジスタ、実用化へ王手
  • URL: https://www.hokudai.ac.jp/news/2023/02/post-1188.html
• [Remarks] Solid-state thermal transistor demonstrated
  • URL: https://www.global.hokudai.ac.jp/blog/solid-state-thermal-transistor-demonstrated/
• [Remarks] 北海道大学 電子科学研究所 太田裕道研究室
  • URL: https://functfilm.es.hokudai.ac.jp/
• [Patent(Industrial Property Rights)] 熱トランジスタ (2024)
  • Inventor(s): 太田裕道, 曲 勇作, ジョンアロン, 卞 志平, 吉村充生
  • Industrial Property Rights Holder: 国立大学法人 北海道大学
  • Industrial Property Rights Type: 特許
  • Industrial Property Number: 2024-018066
  • Filing Date: 2024
• [Funded Workshop] MINI WORKSHOP ON FUNCTIONAL MATERIALS SCIENCE (ORGANIZERS' MEETING) (2023)