MUKAI Kohki

Affiliation

Faculty of Engineering, Division of Systems Research

Job Title

Professor

Date of Birth

1963

Research Fields, Keywords

ナノテクノロジー, マイクロマシン, 化合物半導体, 光素子, 酸化物ワイドギャップ半導体, 無電解めっき, 量子ドット

Mail Address

E-mail address

Web Site

https://kmlab.ynu.ac.jp/index.html

Related SDGs




ORCID  https://orcid.org/0000-0002-1334-6604

写真a

The Best Research Achievement in Research Career 【 display / non-display

Education 【 display / non-display

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    1986

    Kyoto University   Graduated

Degree 【 display / non-display

  • Doctor of Engineering - Kyoto University

Campus Career 【 display / non-display

  • 2017.4
     
     

    Duty   Yokohama National UniversityFaculty of Engineering   Division of Systems Research   Professor  

  • 2009.4
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    2017.3

    Duty   Yokohama National UniversityFaculty of Engineering   Division of Materials Science and Chemical Engineering   Professor  

  • 2007.4
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    2009.3

    Duty   Yokohama National UniversityFaculty of Engineering   Division of Materials Science and Chemical Engineering   Associate Professor  

  • 2003.4
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    2007.3

    Duty   Yokohama National UniversityFaculty of Engineering   Division of Materials Science and Chemical Engineering   Associate Professor  

  • 2018.4
     
     

    Concurrently   Yokohama National UniversityGraduate school of Engineering Science   Department of Mechanical Engineering, Materials Science and Ocean Engineering   Professor  

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External Career 【 display / non-display

  • 1999.4
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    2001.3

     

  • 1999.4
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    2000.3

     

  • 1990.3
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    2003.3

     

  • 1986.4
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    1990.2

     

Academic Society Affiliations 【 display / non-display

  • 2019.12
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    2020.12
     

    Material Research Society

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    電子情報通信学会

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    応用物理学会

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    日本物理学会

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    The Institute of Pure and Applied Physics (IPAP)

Research Areas 【 display / non-display

  • Nanotechnology/Materials / Applied physical properties

  • Nanotechnology/Materials / Thin film/surface and interfacial physical properties

  • Manufacturing Technology (Mechanical Engineering, Electrical and Electronic Engineering, Chemical Engineering) / Electron device and electronic equipment

  • Manufacturing Technology (Mechanical Engineering, Electrical and Electronic Engineering, Chemical Engineering) / Electric and electronic materials

  • Nanotechnology/Materials / Nano/micro-systems

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Qualification acquired 【 display / non-display

  • Organic Solvent Work Chief Person

  • Specified Chemical Substances Work Chief

  • X-ray Work Chief Person

 

Research Career 【 display / non-display

  • ワイドギャップ半導体工学

    Basic Science Research Program  

    Project Year: 2017.4

  • ナノ構造半導体工学

    Basic Science Research Program  

    Project Year:

  • 金属製3次元マイクロマシンの製造技術

    Advanced Technology Development Research  

    Project Year:

  • 最先端フォトニック材料およびデバイス

    Advanced Technology Development Research  

    Project Year:

  • 新規な全光信号処理素子の設計と動作評価

    Advanced Technology Development Research  

    Project Year:

Books 【 display / non-display

  • メタマテリアルの設計、作製と 新材料、デバイス開発への応用

    向井 剛輝, 他( Role: Contributor)

    株式会社技術情報協会  ( ISBN:978-4-86104-876-0

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    Total pages:508   Language:Japanese Book type:Scholarly book

  • Self-assembled quantum dot structure composed of III-V compound semiconductors

    ( Role: Joint author)

    Nano and Micro Materials, Springer 

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    Language:English Book type:Scholarly book

  • Self-Assembled InGaAs/GaAs Quantum Dots

    ( Role: Joint author)

    Semiconductors and Semimetals (Academic Press, New York) 

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    Language:English Book type:Scholarly book

  • Semiconductor Quantum Well Intermixing : Material Properties and Optoelectronic Applications

    ( Role: Joint author)

    Gordon & Breach, Amsterdam 

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    Language:English Book type:Scholarly book

  • Self-Assembled InGaAs/GaAs Quantum Dots

    ( Role: Joint author)

    Academic Press, New York 

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    Language:English Book type:Scholarly book

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Thesis for a degree 【 display / non-display

  • Growth and Characterization of Self-Assembled InGaAs/GaAs Quantum Dots and Their Application to Lasers

    向井 剛輝

    2000.9

    Doctoral Thesis   Single Work    [Reviewed]

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    京都大学博士(工学)工学研究科 電子工学専攻 論工博第3541号
    本博士論文の目的は、1)InGaAs量子ドットの自己形成現象(特に通信用波長である1.3ミクロンで発光する量子ドットについて)、2)自己形成量子ドットの基礎的な光学物性、3)自己形成量子ドットの半導体レーザへのsuccessfulな応用、を示すことにある。本研究開始時には量子ドットの自己形成現象は未だ発見されていなかったが、現在では自己形成量子ドットを用いたレーザが、いくつかの特性において量子井戸レーザと肩を並べるまでになった。筆者は、この分野におけるいくつかの重要な発展に貢献した。まず、自己形成量子ドットが一般に知られる以前に、筆者は独自にInGaAs/GaAs量子ドットの自己形成現象を発見した。そのドットの発光波長は1.3や1.5ミクロンの実用波長をカバーし、通常のStranski-Krastanov (SK)タイプのドットとは異なることが後に分かった。SKドットより高均一なそのドットを用いて、初めてドット内部の離散準位からの発光を観測した。また、その離散準位間のフォノンボトルネック(PB)現象(エネルギ保存則を満たすフォノンが無いことに起因する、準位間キャリア緩和レートの低下)を早い段階で実験的に検証した。提案した新しいモデルによって量子ドット固有のフォトルミネッセンス (PL)減衰曲線を再現し、PB現象を定量的に評価した。また筆者は、量子ドットレーザのミリアンペアでの室温発振を実現し、さらに、世界で初めての(光通信波長帯の)1.3ミクロンにおける室温連続発振を達成した。

Papers 【 display / non-display

  • Study of energy band diagrams required for intermediate band solar cells using PbS quantum dots based on photoemission yield spectroscopy measurements in air

    Mukai, K; Sato, Y; Yoshikuni, N; Ikeda, S

    COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS   708   2025.3

    DOI Web of Science

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    Language:The in addition, foreign language   Publishing type:Research paper (scientific journal)   Joint Work  

  • An In-Plane Single-Photon Emitter Combining a Triangular Split-Ring Micro-Optical Resonator and a Colloidal Quantum Dot

    Mukai, K; Uchiyama, K; Iwata, K; Pribyl, I

    NANOMATERIALS   15 ( 5 )   2025.3

    DOI Web of Science PubMed

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    Language:The in addition, foreign language   Publishing type:Research paper (scientific journal)   Joint Work  

  • Improved performance of solar cells using chemically synthesized SnSe nanosheets as light absorption layers

    Mukai, K; Wanibuchi, R; Nunomura, Y

    JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS   35 ( 10 )   2024.4  [Reviewed]

    DOI Web of Science

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    Language:English   Publishing type:Research paper (scientific journal)   Joint Work  

  • Improvement of solar cell performance using PbS quantum dot superlattices with iodine ligands

    Mukai, K; Ikeda, S; Pribyl, I; Sato, H; Masuda, I

    COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS   685   133285   2024.3  [Reviewed]

    DOI Web of Science CiNii Research

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:Elsevier   Joint Work  

    We investigated the method to improve the performance of solar cells that use colloidal quantum dots (QDs) as light absorption layers. By replacing ligands of PbS QDs with iodine, adjusting QD concentration in a solvent suitable for the ligands, and preparing QD films by the sedimentation method, photoelectric conversion efficiency of QD solar cells was improved. It is known that by depositing QDs freely onto a substrate in a solvent, QDs are closest packed to form a superlattice. A suitable solvent that aided the free sedimentation of QDs facilitated the QD superlattice formation. Iodine ligands had narrowed QD spacing, promoting intermediate bands formation in the QD superlattices. QD concentration had affected the film quality. To achieve high performance expected for QD superlattice solar cells in future, it is necessary to develop carrier transport layers that extract carriers from high energy bands originating from excited states in QDs.

  • Polarization-controlled ultrasmall single photon emitter combining a quantum dot and an elliptical split ring metamaterial element

    Mukai, K; Pribyl, I; Nakagawa, T; Uchiyama, K

    JAPANESE JOURNAL OF APPLIED PHYSICS   63 ( 2 )   02SP37   2024.2  [Reviewed]

    DOI Web of Science CiNii Research

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:IOP Publishing   Joint Work  

    We propose a polarization-controlled ultrasmall single-photon emitter that combines a single photon source and an elliptical split ring (SR) type metamaterial element. Simulations using the finite difference time domain method showed that in elliptical metamaterial elements, the annular mode is suppressed and axial electric field oscillations occur preferentially, resulting in upward light emission from the photon source with controlled polarization. We fabricated prototype devices by focused ion beam lithography and PbS quantum dots. Evaluation of the optical properties of the devices revealed that the emission spectrum width was narrower and the emission lifetime was shorter than those of quantum dot ensemble, and that the polarization was controlled along the minor axis of ellipse. These suggested that the quantum dot emission and the metamaterial element resonated as expected. The combination of a single quantum dot and a single elliptical SR-type metamaterial element was shown to have the potential to operate as a polarization-controlled single-photon emitter.

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Review Papers 【 display / non-display

  • 超高効率のマルチバンド量子ドット超格子太陽電池 --- 提案とその性能予測 ---

    向井剛輝

    クリーンテクノロジー   33 ( 01 )   29 - 33   2023.1

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    Authorship:Lead author, Last author, Corresponding author   Language:Japanese   Publishing type:Article, review, commentary, editorial, etc. (trade magazine, newspaper, online media)   Single Work  

  • 超高効率なタンデム型太陽電池の構造の簡素化とその製造技術 <タンデム型量子ドット超格子太陽電池>

    向井剛輝

    クリーンエネルギー   31 ( 11 )   27 - 33   2022.11

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    Authorship:Lead author, Last author, Corresponding author   Language:Japanese   Publishing type:Article, review, commentary, editorial, etc. (trade magazine, newspaper, online media)   Single Work  

  • QDを用いた量子情報処理素子

    向井剛輝

    Yano E puls   164 ( 11 )   33   2021.11

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    Language:Japanese   Publishing type:Article, review, commentary, editorial, etc. (trade magazine, newspaper, online media)   Single Work  

  • Special Issue “Superlattice Devices"

    Kohki Mukai

    2019.7

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    Language:Japanese   Publishing type:Article, review, commentary, editorial, etc. (trade magazine, newspaper, online media)   Single Work  

  • コロイド型量子ドットを用いた光子発生器

    向井剛輝

    光アライアンス   Vol.30 ( 7 )   16 - 19   2019.7

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    Language:Japanese   Publishing type:Article, review, commentary, editorial, etc. (bulletin of university, research institution)   Publisher:日本工業出版   Single Work  

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Works 【 display / non-display

  • 8-16 量子ドット(QD)

    向井剛輝

    2018

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    Work type:Database science   Location:電子情報通信学会 知識ベース「知識の森」  

Industrial Property Rights 【 display / non-display

  • マイクロファスナー、マイクロファスナーの製造方法、及びマイクロファスナー素子

    向井剛輝、丸尾昭二

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    Applicant:横浜国大

    Application no:特願2010-005809  Date applied:2010.1.14

    Country of applicant:Domestic  

  • 微小構造体の製造方法

    向井剛輝、丸尾昭二、八高隆雄

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    Applicant:向井剛輝、丸尾昭二、八高隆雄

    Application no:特願2004-217825  Date applied:2004.7

    Country of applicant:Domestic  

  • 光制御素子、発光素子、光回路装置

    向井剛輝

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    Applicant:向井剛輝

    Application no:特願2004-215574  Date applied:2004.7

    Country of applicant:Domestic  

  • 光干渉器

    向井剛輝

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    Application no:特許2002-324761  Date applied:2002.11.8

    Country of applicant:Domestic  

  • モノリシック光干渉素子

    向井剛輝

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    Application no:特許2002-298445  Date applied:2002.10.11

    Country of applicant:Domestic  

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Awards 【 display / non-display

  • quarterly HOT article collection(CrystEngComm論文賞)

    2023.1   Royal Society of Chemistry  

    Individual or group name of awards:Kohki Mukai and Keishiro Hirota

  • 応⽤物理学会第14回(2020年度)フェロー表彰

    2020.9   公益社団法⼈ 応⽤物理学会   光通信波⻑帯量⼦ドットとそのレーザー応⽤に関する先駆的研究

    Individual or group name of awards:向井剛輝

  • 文部科学大臣表彰 科学技術賞

    2008.4    

  • JJAP編集貢献賞

    2008.4    

  • 船井情報科学振興賞

    2007.4    

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Grant-in-Aid for Scientific Research 【 display / non-display

  • ナノ結晶とメタマテリアル共振器を組み合わせた革新的な極小単一光子放出器の創生

    2021 - 2024.3

    Grant-in-Aid for Challenging Research (Pioneering)

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    Authorship:Principal investigator  Grant type:Competitive

  • コロイド型量子ドット超格子膜の開発による太陽電池の高効率化の実証

    2018.4 - 2021.3

    科学研究費補助金  Grant-in-Aid for Scientific Research(C)

    Investigator(s):向井剛輝

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    Grant type:Competitive

  • 化学合成した量子ドットを用いる量子光学固体素子の製造技術の研究

    2012.4 - 2015.3

    科学研究費補助金  Grant-in-Aid for Scientific Research(B)

    Investigator(s):向井剛輝

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    Grant type:Competitive

  • ポリマー分散型量子ドットを内包するマイクロキャビティ構造の研究

    2008.4 - 2011.3

    科学研究費補助金  Grant-in-Aid for Scientific Research(C)

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    Grant type:Competitive

Other external funds procured 【 display / non-display

  • 中空糸膜モジュールによるQDのサイズ選択制御

    2021.4 - 2022.3

    Private Foundations 

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    Authorship:Principal investigator 

  • コロイド型量子ドット超格子を有する高効率有機太陽電池の研究

    2018.2 - 2020.3

    Private Foundations  能村膜構造技術振興財団

  • コロイド型量子ドットとメタマテリアルの結合を用いた単一光子源の開発

    2017.5 - 2018.3

    Ministry of Education, Culture, Sports, Science and Technology  ナノテクノロジープラットフォーム

    Investigator(s):向井剛輝

  • 超高効率太陽電池を実現するコロイド型量子ドット超格子の拡大均一化技術

    2016.4 - 2018.3

    Private Foundations  岩谷直治記念財団研究助成

  • メタマテリアルと量子ドットを用いた極小単一光子放出器の創出

    2016.4 - 2018.3

    Private Foundations  キャノン財団研究助成

    Investigator(s):向井剛輝

Presentations 【 display / non-display

  • ヨウ素配位子置換によるPbS量子ドット超格子太陽電池の高性能化

    池田征弥、増田伊吹、向井剛輝

    春期応用物理学会講演会  応用物理学会

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    Event date: 2024.3

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:東京都市大学世田谷キャンパス  

  • PbS量子ドットの厚膜シリカコーティング形成のための初期シラン化とTEOS熱強制分解法の検討

    城詰大翔、プリブル一生、内山恭介、向井剛輝

    春期応用物理学会講演会  応用物理学会

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    Event date: 2024.3

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:東京都市大学世田谷キャンパス  

  • ヨウ素配位子を用いたPbS量子ドット超格子太陽電池実現のための諸検討

    吉國希望、池田征弥、増田伊吹、向井剛輝

    春期応用物理学会講演会  応用物理学会

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    Event date: 2024.3

    Language:Japanese   Presentation type:Oral presentation (general)  

  • PbS量子ドット超格子太陽電池の実現に向けたバンドダイアグラムの検討

    佐藤友哉、吉國希望、池田征弥、増田伊吹、向井剛輝

    春期応用物理学会講演会  応用物理学会

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    Event date: 2024.3

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:東京都市大学世田谷キャンパス  

  • 量子ドットと楕円形スプリットリング型メタマテリアルを組み合わせた偏光制御単一光子放出器

    プリブル 一生、内山 恭介、向井 剛輝

    ナノテク交流シンポジウム  2024.3 

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    Event date: 2024.3

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:横浜市立大学  

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Preferred joint research theme 【 display / non-display

  • 次世代型高効率太陽電池(量子ドット超格子)

  • 量子ドット単一光子放出器

Past of Collaboration and Commissioned Research 【 display / non-display

  • 中空糸膜モジュールによるQDのサイズ選択制御技術

    Cooperative Research within Japan  

    Project Year: 2021.4  -  2022.3 

  • 酸化ガリウム基板の光素子応用のための基礎検討

    Cooperative Research within Japan  

    Project Year: 2017.4  -  2018.3 

  • Ni-Ti合金金属薄膜のドライプロセスによる作製と機能創生

    Offer organization: 横浜市工業技術支援センター   Cooperative Research within Japan  

    Project Year: 2012.4  -  2014.3 

  • 光造形技術を応用したマイクロ部品成形技術の研究

    Offer organization: 日本発条   Cooperative Research within Japan  

    Project Year: 2011.6  -  2012.3 

  • 3次元マイクロ光造形技術のMEMS応用

    Offer organization: ソニー   Cooperative Research within Japan  

    Project Year: 2010.12  -  2014.3 

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Charge of on-campus class subject 【 display / non-display

  • 2025   Exercises in Physics

    College of Engineering Science

  • 2025   Statistical Physics

    College of Engineering Science

  • 2025   Electronic Properties of Solids

    College of Engineering Science

  • 2025   Introduction to Materials for Electronics and Optoelectronics

    Graduate school of Engineering Science

  • 2025   Advanced Materials Engineering

    Graduate school of Engineering Science

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Committee Memberships 【 display / non-display

  • A-STEP審査会

    2024.4  査読委員

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    Committee type:Government 

  • NEDO太陽電池リサイクル革新的技術開発 採択審査会

    2024.1 - 2024.4  採択審査委員

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    Committee type:Government 

  • NEDO多接合型等を対象とした太陽電池開発の採択審査会

    2023.5 - 2023.6  採択審査委員

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    Committee type:Government 

  • NEDOエネルギー・環境新技術先導研究プログラム採択審査会

    2023.2 - 2023.3  採択審査委員

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    Committee type:Government 

  • NEDOエネルギー分野における革新的技術の国際共同研究開発事業審査会

    2022.7 - 2022.8  ステージゲート審査委員

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    Committee type:Government 

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Social Contribution(Extension lecture) 【 display / non-display

  • セミナー「PbS量子ドットの化学合成と光量子エレクトロニクス分野ヘの応用」

    Role(s): Lecturer

    技術情報協会  技術情報協会セミナー/「量子ドット(QD)」の設計, カドミウムフリー化,応用,今後の展望  2024.3

  • JST新技術説明会

    Role(s): Lecturer

    JST  2022.6

  • 矢野経済研究所「Yano E Plus」寄稿

    Role(s): Filming support, Edit, Consultant, Report author

    矢野経済研究所  2019.7

     More details

    Audience: Researchers, General public, Scientific organization, Company, Government agency, Media

    Type:Promotional material

  • 日本工業出版「光アライアンス」寄稿

    Role(s): Filming support, Consultant, Official expert, Report author

    2019.7

     More details

    Audience: University students, Graduate students, Researchers, General public, Scientific organization, Company, Government agency

    Type:Promotional material

  • 技術情報協会講演会

    Role(s): Guest

    技術情報協会  2019.1

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    Audience: Researchers, General public

    Type:Lecture

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Media Coverage 【 display / non-display

  • 矢野経済研究所「Yano E Plus」寄稿

    矢野経済研究所  2021.11