Updated on 2026/10/23

写真a

 
VACHA MARTIN
 
Organization
School of Materials and Chemical Technology Professor
Title
Professor
Homepage
http://vacha.mat.mac.titech.ac.jp/
External link

News & Topics

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Degree

  • Doctor of Science

Research Interests

  • Single molecule spectroscopy

  • 単一分子分光

Research Areas

  • Nanotechnology/Materials / Organic functional materials

Education

  • Charles University, Prague,   Faculty of Mathematics and Physics,   Department of Chemical Physics

    - 1991

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  • Charles University, Prague,   Faculty of Mathematics and Physics,   Department of Chemical Physics

    - 1991

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Professional Memberships

Committee Memberships

  • Nature Publishing Group   NPG Asia Materials Editorial Board  

    2012.1   

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    Committee type：Other

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Papers

  • Efficient Hot Carrier Management in Lead Halide Perovskite Micro‐Disks Revealed by Super‐Diffusive Migration Reviewed

    Nithin Pathoor, Shun Omagari, Martin Vacha

    Advanced Science   2026.7

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    Authorship：Corresponding author   Language：English   Publishing type：Research paper (scientific journal)  

    <jats:title>ABSTRACT</jats:title>
    <jats:p>
    Metal halide perovskites exhibit exceptional optoelectronic properties arising from their defect tolerance, high absorption coefficient, tunable bandgap, and long‐range charge transport. The soft crystal structure and interaction with light lead to a number of interesting observations over the years. Here, we investigate carrier migration in anti‐solvent‐assisted grown methylammonium lead bromide (MAPbBr
    <jats:sub>3</jats:sub>
    ) micro‐disks (MDs) using spatially resolved photoluminescence (PL) lifetime microscopy. Confocal excitation reveals rapid outward carrier migration accompanied by pronounced non‐linear PL spatial broadening, indicative of super‐diffusive carrier migration. Under deep conduction band excitation at 375 nm, carriers exhibit accelerated diffusion over hundreds of nanometers on an ultra‐stable nanosecond timescale, with diffusivity increasing from initial average values of ∼0.44 cm
    <jats:sup>2</jats:sup>
    /s to equilibrium values exceeding 0.88 cm
    <jats:sup>2</jats:sup>
    /s. The degree of non‐linearity, represented by an average non‐linearity coefficient of 1.5, signifies strong deviation from classical diffusion. Comparative measurements with 485 nm excitation, temperature‐dependent studies, and analysis of diffusivity gain and non‐linearity demonstrate that these dynamics originate from stabilized hot carriers interacting with low‐energy LO phonon modes through large‐polaron formation. The observation of nanosecond‐scale super‐diffusion in perovskite microstructures highlights efficient hot‐carrier transport, with implications for designing high‐performance optoelectronic and hot‐carrier energy‐harvesting devices.
    </jats:p>

    DOI： 10.1002/advs.76474

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  • Long-Range Exciton Transport in Anthracene-Based Supramolecular Mesostructures and Its Control by Surface Plasmons Reviewed

    Nithin Pathoor, Qiwen Tan, Wenhao Zhang, Misa Nozaki, Takatoshi Fujita, Toranosuke Takagi, Shun Omagari, Yoshimitsu Sagara, Martin Vacha

    Nano Letters   2026.7

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    Authorship：Corresponding author   Publishing type：Research paper (scientific journal)  

    DOI： 10.1021/acs.nanolett.6c02411

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  • Photoluminescence Emitter with 100% Power Efficiency─The Key Role of the Absorption Edge in CsPbBr3 Perovskite Quantum Dots

    Jan Valenta, Michael Greben, Toranosuke Takagi, Martin Vacha

    ACS Nano   2026.5

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    Publishing type：Research paper (scientific journal)  

    DOI： 10.1021/acsnano.6c02074

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  • Unveiling the nanoscale dynamics of electroluminescence

    Martin Vacha

    Nature Photonics   2026.5

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    Authorship：Corresponding author   Language：English   Publishing type：Research paper (scientific journal)  

    DOI： 10.1038/s41566-026-01895-2

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  • Folding-Mediated Self-Assembly of Sterically Demanding π-Luminophore Dyads into Nanotubes Exhibiting Multidirectional Exciton Transport Reviewed

    Takumi Aizawa, Hironari Arima, Sota Mihara, Takahiro Ueno, Shotaroh Yoshii, Takuho Saito, Hiroki Itabashi, Sougata Datta, Hiroki Hanayama, Akira Sakamoto, Rintaro Shimada, Sarah E. Rogers, Martin J. Hollamby, Takashi Kajitani, Yoshiki Ishii, Go Watanabe, Koji Harano, Takuma Matsumoto, Nithin Pathoor, Martin Vacha, Hikaru Sotome, Shiki Yagai

    Journal of the American Chemical Society   2026.4

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    Publishing type：Research paper (scientific journal)   Publisher：American Chemical Society (ACS)  

    The hierarchical self-assembly of folded proteins into functional nanostructures has long served as a conceptual foundation for designing synthetic polymer systems. However, the efficacy of folding-based strategies in small-molecule assemblies remains largely unproven. Here, we show that highly emissive diphenylanthracene derivatives, previously considered aggregation-incompetent, can be directed to form highly ordered nanotubular structures through conformational preorganization via scissor-shaped dimerization. Stepwise π-core expansion from terphenylene to diphenylanthracene in the foldable supramolecular synthons induces a morphological progression from twisted ribbons to helical coils and, ultimately, to hollow nanotubes. This structural evolution is driven by folding-assisted directional π–π stacking and cooperative hydrogen bonding. The diphenylanthracene-based nanotubes exhibit multidirectional exciton transport enabled by a herringbone-like arrangement of chromophores. These findings demonstrate that folding-mediated self-assembly offers a viable design strategy for integrating hierarchical order and advanced optoelectronic function into π-systems.

    DOI： 10.1021/jacs.6c00854

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  • Room temperature collective blinking and photon bunching from CsPbBr3 quantum dot superlattice

    Qiwen Tan, Sudipta Seth, Boris Louis, Xiayan Wu, Nithin Pathoor, Toranosuke Takagi, Shun Omagari, Takumi Sannomiya, Johan Hofkens, Martin Vacha

    Nature Communications   2026.3

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    Authorship：Corresponding author   Publishing type：Research paper (scientific journal)  

    DOI： 10.1038/s41467-026-70931-0

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  • Nanoparticle-Mediated Interface Engineering for Uniform, Reproducible Electron Transport Layers in Scalable Perovskite Solar Cells

    Charlie Henderson, Adriano S. Marques, Izabela S. Bicalho, Lucy J. F. Hart, Amy Monahan, Katherine Stewart, Koki Asano, Tianhao Lan, Martin Vacha, Molly M. Stevens, Piers R. F. Barnes, Diego Bagnis, Ji-Seon Kim

    ACS Applied Materials & Interfaces   2026.2

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    Publishing type：Research paper (scientific journal)  

    DOI： 10.1021/acsami.5c24295

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  • Controls and evidence for assigning europium emission in Eu-treated CsPbCl3 nanocrystals

    Yanfei Wang, Martin Vacha, Shun Omagari

    Physical Chemistry Chemical Physics   2026

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    Publishing type：Research paper (scientific journal)  

    DOI： 10.1039/D6CP00181E

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  • Synthesis and single-particle photophysics of BaZrS3 chalcogenide perovskite quantum dots

    Toranosuke Takagi, Yoshinori Kimoto, Nithin Pathoor, Shun Omagari, Tadashi Kawamoto, Takuya Kato, Hiroaki Nakamura, Issei Takenaka, Martin Vacha

    Nanoscale   2026

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    Authorship：Corresponding author   Publishing type：Research paper (scientific journal)  

    DOI： 10.1039/D5NR05045F

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  • 1D Silver Organochalcogenide Semiconductors: Color Tunable Luminescence, Polarized Emission, and Long-Range Exciton Diffusion

    Tomoaki Sakurada, Nithin Pathoor, Takuma Matsumoto, Rattapon Khamlue, Petcharaphorn Chatsiri, Jan Valenta, Tadashi Kawamoto, Shun Omagari, William A. Tisdale, Watcharaphol Paritmongkol, Yeongsu Cho, Martin Vacha

    Journal of the American Chemical Society   2025.10

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    Authorship：Corresponding author   Publishing type：Research paper (scientific journal)   Publisher：American Chemical Society (ACS)  

    DOI： 10.1021/jacs.5c12551

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  • Chelation-Driven Dissolution and Single-Crystal Growth of Hybrid Metal Organochalcogenide Semiconductors by Polydentate Amines

    Rattapon Khamlue, Petcharaphorn Chatsiri, Tomoaki Sakurada, Jesadaporn Chotimook, Pimpan Leangtanom, Pongkamon Prayongkul, Thassanant Atithep, Jintara Padchasri, Pinit Kidkhunthod, Martin Vacha, Pichaya Pattanasattayavong, Watcharaphol Paritmongkol

    Journal of the American Chemical Society   2025.10

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    Publishing type：Research paper (scientific journal)  

    DOI： 10.1021/jacs.5c10260

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  • Luminescence Variability of CsPbBr3 Nanocrystals in Single-Particle Emitter Applications

    Shun Omagari, Eisuke Hirao, Martin Vacha

    ACS Applied Nano Materials   2025.8

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    Publishing type：Research paper (scientific journal)  

    DOI： 10.1021/acsanm.5c03524

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  • Vortex-Flow-Directed Chiral Macroscopic Ordering of Platelet Nanostructures Formed via the Supramolecular Assembly of Platinum Complexes with Bis(phenylisoxazolyl)benzene

    Masaya Yoshida, Kyota Yasuda, Takuma Matsumoto, Yudai Ono, Naoyuki Hisano, Mao Kawasaki, Takehiro Hirao, Ye Yuan, Shin-ichi Tate, Martin Vacha, Takeharu Haino

    Journal of the American Chemical Society   2025.8

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    Publishing type：Research paper (scientific journal)  

    DOI： 10.1021/jacs.5c03761

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  • Anisotropic Cation Migration Drives the Formation and Stability of Lateral 3D/2D Perovskite Heterostructures

    Xiayan Wu, Shun Omagari, Martin Vacha

    ACS Energy Letters   2025.7

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    Authorship：Corresponding author   Publishing type：Research paper (scientific journal)  

    DOI： 10.1021/acsenergylett.5c01551

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  • Unveiling the Local Fate of Charge Carriers in Halide Perovskite Thin Films via Correlation Clustering Imaging

    Sudipta Seth, Boris Louis, Koki Asano, Toon Van Roy, Maarten B. J. Roeffaers, Elke Debroye, Ivan G. Scheblykin, Martin Vacha, Johan Hofkens

    Chemical & Biomedical Imaging   2025.4

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    Authorship：Corresponding author   Publishing type：Research paper (scientific journal)  

    DOI： 10.1021/cbmi.4c00113

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  • Real-Time Structural Dynamics at the 3D/2D Perovskite Interface in CsPbBr3/PEA2PbBr4 Nano-heterostructures

    Xiayan Wu, Nithin Pathoor, Xin Xu, Shun Omagari, Toranosuke Takagi, Martin Vacha

    Nano Letters   2025.1

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    Authorship：Corresponding author   Publishing type：Research paper (scientific journal)  

    DOI： 10.1021/acs.nanolett.4c05021

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  • Small Au Nanoparticles Synthesized by Peptide-Based Biomineralization for Catalytic Applications

    Masayoshi Tanaka, Yuka Kiriki, Nozomi Kiyohara, Mirei Hayashi, Abiral Tamang, Tomonori Nakamura, Martin Vacha, Yonghyun Choi, Jonghoon Choi, Wataru Yoshida, Kevin Critchley, Stephen D. Evans, Mina Okochi

    ACS Applied Nano Materials   2024.5

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    Publishing type：Research paper (scientific journal)  

    DOI： 10.1021/acsanm.4c00780

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  • Spectrally Selective Leakage of Light from Self-Assembled Supramolecular Nanofiber Waveguides Induced by Surface Plasmon Polaritons

    Qiwen Tan, Nao Koishihara, Shun Omagari, Takehiro Hirao, Takeharu Haino, Martin Vacha

    The Journal of Physical Chemistry C   128 ( 10 )   4295 - 4302   2024.3

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    Authorship：Corresponding author   Publishing type：Research paper (scientific journal)   Publisher：American Chemical Society (ACS)  

    DOI： 10.1021/acs.jpcc.3c08258

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  • Resolving Multi-Asperity Contacts at the Nanoscale through Super-Resolution Fluorescence Imaging

    Begüm Demirkurt, Dina Petrova, Dharmendar Kumar Sharma, Martin Vacha, Bart Weber, Daniel Bonn, Albert M. Brouwer

    The Journal of Physical Chemistry Letters   2024.2

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    Publishing type：Research paper (scientific journal)  

    DOI： 10.1021/acs.jpclett.3c02799

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  • Impact of Ring-Closing on the Photophysical Properties of One-Dimensional π-Conjugated Molecular Aggregate

    Sho Takahashi, Takuma Matsumoto, Martin J. Hollamby, Hiroshi Miyasaka, Martin Vacha, Hikaru Sotome, Shiki Yagai

    Journal of the American Chemical Society   2024.1

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    Authorship：Corresponding author   Publishing type：Research paper (scientific journal)   Publisher：American Chemical Society (ACS)  

    DOI： 10.1021/jacs.3c11407

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  • In Situ Monitoring of Nanocrystal Formation and Ion Migration in Lead Halide Perovskite Metal–Organic Framework Composites

    Xiayan Wu, Shun Omagari, Jinwei Gao, Martin Vacha

    Advanced Optical Materials   2024.1

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    Authorship：Corresponding author   Publishing type：Research paper (scientific journal)  

    DOI： 10.1002/adom.202301479

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Research Projects

  • Meso-hierarchy optical characterization

    Grant number：23H04875  2023.4 - 2028.3

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Transformative Research Areas (A)

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    Grant amount：\160420000 （ Direct Cost: \123400000 、 Indirect Cost：\37020000 ）

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  • Study of electroluminescence and photophysical properties of single halide perovskite nanocrystals

    Grant number：19H02684  2019.4 - 2024.3

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (B)

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    Grant amount：\17940000 （ Direct Cost: \13800000 、 Indirect Cost：\4140000 ）

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