Research activity information

• Nov. 2025 Science and Technology of Advanced Materials（STAM）, STAM Award, Young Scientist Award


• Aug. 2022 日本学術振興会, Postdoctoral Fellowship for Overseas Researchers

  Yih-Ren Chang


• Nov. 2018 日本台湾交流協会, International Student Scholarship

  Yih-Ren Chang


• Jan. 2018 台湾物理学会, Graduate Student Thesis Award, 最優秀論文賞

  Yih-Ren Chang


• Sep. 2017 ラムリサーチ, Lam research award, 優秀修士論文賞

  Yih-Ren Chang

• Improved thermal stability of Au-capped antireflective substrates with organic adhesion layers for real-time nanomaterial imaging

  Yoshiaki Hattori, Yih-Ren Chang, Masatoshi Kitamura

  May 2026, Nanotechnology

  Scientific journal


• Trion Transfer in Mixed-Dimensional Heterostructures

  Nan Fang, Ufuk Erkiliç, Yih-Ren Chang, Shun Fujii, Daiki Yamashita, Chee Fai Fong, Satoru Morito, Kaito Kanahashi, Takashi Taniguchi, Kenji Watanabe, Keiji Ueno, Kosuke Nagashio, Yuichiro K. Kato

  Apr. 2026, ACS Nano

  [Refereed]

  Scientific journal


• Dielectric environment engineering via 2D material heterostructure formation on a hybrid photonic crystal nanocavity [Invited]

  C. F. Fong, D. Yamashita, N. Fang, Y.-R. Chang, S. Fujii, T. Taniguchi, K. Watanabe, Y. K. Kato

  Hybrid integration of two-dimensional (2D) materials with nanophotonic structures has enabled compact and tunable optoelectronic devices. Yet, the influence of local dielectric perturbations introduced during integration remains underexplored, particularly for multilayer or heterostructure assemblies. Here, we demonstrate deliberate dielectric environment engineering of photonic crystal (PhC) nanocavities through sequential stacking of 2D material flakes. Building upon our previous finding that a monolayer can induce a self-aligned cavity, we show that multilayer and heterostructure stacking enable further post-fabrication control over cavity properties. The hybrid nanocavities maintain high optical quality under multiple transfers, and encapsulation with hexagonal boron nitride (hBN) yields nearly twofold recovery of the quality factor by effectively smoothing the refractive-index profile and reducing out-of-plane losses. These experimental results are consistent with numerical simulations. Enhanced photoluminescence and reduced emission lifetime from the MoTe ₂ flake on the hybrid cavity confirm Purcell-enhanced light-matter coupling. These results establish a robust and reconfigurable strategy for tuning cavity performance through controlled heterostructure assembly, expanding the design toolbox for scalable hybrid nanophotonic systems.

  Optica Publishing Group, Feb. 2026, Optical Materials Express, 16(3) (3), 646 - 646

  [Refereed][Invited]

  Scientific journal


• Quantum defects in carbon nanotubes as single-photon sources

  Yih-Ren Chang, Jacob Fortner, Vigneshwaran Chandrasekaran, Brendan J. Gifford, Braden M. Weight, Stephen K. Doorn, Han Htoon, Yuichiro K. Kato, Sergei Tretiak, YuHuang Wang

  Lead, Springer Science and Business Media LLC, Feb. 2026, Communications Materials, 7(1) (1)

  [Refereed]

  Scientific journal


• Controlling droplet dynamics in inkjet printing through hydrophilic/hydrophobic patterning for organic thin-film formation

  Shintaro Tsuda, Yih-Ren Chang, Masatoshi Kitamura, Yoshiaki Hattori

  Aug. 2025, Japanese Journal of Applied Physics

  [Refereed]

  Scientific journal


• Bulk Photovoltaic Effect in Single Ferroelectric Domain of SnS Crystal and Control of Local Polarization by Strain

  Ryo Nanae, Satsuki Kitamura, Yih-Ren Chang, Kaito Kanahashi, Tomonori Nishimura, Redhwan Moqbel, Kung-Hsuan Lin, Mina Maruyama, Yanlin Gao, Susumu Okada, Kai Qi, Jui-Han Fu, Vincent Tung, Takashi Taniguchi, Kenji Watanabe, Kosuke Nagashio

  Oct. 2024, ADVANCED FUNCTIONAL MATERIALS, 34(41) (41), English

  [Refereed]

  Scientific journal


• Self-Aligned Hybrid Nanocavities Using Atomically Thin Materials

  Chee Fai Fong, Daiki Yamashita, Nan Fang, Shun Fujii, Yih-Ren Chang, Takashi Taniguchi, Kenji Watanabe, Yuichiro K. Kato

  May 2024, ACS PHOTONICS, 11(6) (6), 2247 - 2254, English

  [Refereed]

  Scientific journal


• Room-temperature quantum emission from interface excitons in mixed-dimensional heterostructures

  N. Fang, Y. R. Chang, S. Fujii, D. Yamashita, M. Maruyama, Y. Gao, C. F. Fong, D. Kozawa, K. Otsuka, K. Nagashio, S. Okada, Y. K. Kato

  Apr. 2024, Nature Communications

  [Refereed]

  Scientific journal


• Resonant exciton transfer in mixed-dimensional heterostructures for overcoming dimensional restrictions in optical processes

  N. Fang, Y. R. Chang, D. Yamashita, S. Fujii, M. Maruyama, Y. Gao, C. F. Fong, K. Otsuka, K. Nagashio, S. Okada, Y. K. Kato

  Dec. 2023, Nature Communications

  [Refereed]

  Scientific journal


• Shift-Current Photovoltaics Based on a Non-Centrosymmetric Phase in In-Plane Ferroelectric SnS

  Yih-Ren Chang, Ryo Nanae, Satsuki Kitamura, Tomonori Nishimura, Haonan Wang, Yubei Xiang, Keisuke Shinokita, Kazunari Matsuda, Takashi Taniguchi, Kenji Watanabe, Kosuke Nagashio

  Lead, Jul. 2023, ADVANCED MATERIALS, 35(29) (29), English

  [Refereed]

  Scientific journal


• Wavelength dependence of polarization-resolved second harmonic generation from ferroelectric SnS few layers

  Redhwan Moqbel, Yih-Ren Chang, Zi-Yi Li, Sheng-Hsun Kung, Hao-Yu Cheng, Chi-Cheng Lee, Kosuke Nagashio, Kung-Hsuan Lin

  Jan. 2023, 2D MATERIALS, 10(1) (1), English

  [Refereed]

  Scientific journal


• Performance Enhancement of SnS/h-BN Heterostructure p-Type FET via the Thermodynamically Predicted Surface Oxide Conversion Method

  Yih-Ren Chang, Tomonori Nishimura, Takashi Taniguchi, Kenji Watanabe, Kosuke Nagashio

  Lead, Apr. 2022, ACS APPLIED MATERIALS & INTERFACES, 14(17) (17), 19928 - 19937, English

  [Refereed]

  Scientific journal


• Thermodynamic Perspective on the Oxidation of Layered Materials and Surface Oxide Amelioration in 2D Devices

  Yih-Ren Chang, Tomonori Nishimura, Kosuke Nagashio

  Lead, Sep. 2021, ACS APPLIED MATERIALS & INTERFACES, 13(36) (36), 43282 - 43289, English

  [Refereed]

  Scientific journal


• Self-assembly nuclei with a preferred orientation at the extended hydrophobic surface toward textured growth of ZnO nanorods in aqueous chemical bath deposition

  Chia-Hao Yu, Chang-Chen Lo, Kuan-Hung Chen, Yih-Ren Chang, Chun-Wei Chen, Cheng-Yen Wen

  Apr. 2021, NANOTECHNOLOGY, 32(17) (17), English

  [Refereed]

  Scientific journal


• Atomic-Step-Induced Screw-Dislocation-Driven Spiral Growth of SnS

  Yih-Ren Chang, Naoki Higashitarumizu, Hayami Kawamoto, Fu-Hsien Chu, Chien-Ju Lee, Tomonori Nishimura, Rong Xiang, Wen-Hao Chang, Shigeo Maruyama, Kosuke Nagashio

  Lead, Jan. 2021, CHEMISTRY OF MATERIALS, 33(1) (1), 186 - 194, English

  [Refereed]

  Scientific journal


• High-Performance InSe Transistors with Ohmic Contact Enabled by Nonrectifying Barrier-Type Indium Electrodes

  Yu-Ting Huang, Yi-Hsun Chen, Yi-Ju Ho, Shih-Wei Huang, Yih-Ren Chang, Kenji Watanabe, Takashi Taniguchi, Hsiang-Chih Chiu, Chi-Te Liang, Raman Sankar, Fang-Cheng Chou, Chun-Wei Chen, Wei-Hua Wang

  Oct. 2018, ACS APPLIED MATERIALS & INTERFACES, 10(39) (39), 33450 - 33456, English

  [Refereed]

  Scientific journal


• Surface Oxidation Doping to Enhance Photogenerated Carrier Separation Efficiency for Ultrahigh Gain Indium Selenide Photodetector

  Yih-Ren Chang, Po-Hsun Ho, Cheng-Yen Wen, Tzu-Pei Chen, Shao-Sian Li, Jhe-Yi Wang, Min-Ken Li, Che-An Tsai, Raman Sankar, Wei-Hua Wang, Po-Wen Chiu, Fang-Cheng Chou, Chun-Wei Chen

  Lead, Nov. 2017, ACS PHOTONICS, 4(11) (11), 2930 - 2936, English

  [Refereed]

  Scientific journal


• High-Mobility InSe Transistors: The Role of Surface Oxides

  Po-Hsun Ho, Yih-Ren Chang, Yu-Cheng Chu, Min-Ken Li, Che-An Tsai, Wei-Hua Wang, Ching-Hwa Ho, Chun-Wei Chen, Po-Wen Chiu

  Jul. 2017, ACS NANO, 11(7) (7), 7362 - 7370, English

  [Refereed]

  Scientific journal


• Tunable Photoinduced Carrier Transport of a Black Phosphorus Transistor with Extended Stability Using a Light-Sensitized Encapsulated Layer

  Po-Hsun Ho, Min-Ken Li, Raman Sankar, Fu-Yu Shih, Shao-Sian Li, Yih-Ren Chang, Wei-Hua Wang, Fang-Cheng Chou, Chun-Wei Chen

  Jun. 2016, ACS PHOTONICS, 3(6) (6), 1102 - 1108, English

  [Refereed]

  Scientific journal


• Precisely Controlled Ultrastrong Photoinduced Doping at Graphene-Heterostructures Assisted by Trap-State-Mediated Charge Transfer

  Po-Hsun Ho, Chun-Hsiang Chen, Fu-Yu Shih, Yih-Ren Chang, Shao-Sian Li, Wei-Hua Wang, Min-Chuan Shih, Wei-Ting Chen, Ya-Ping Chiu, Min-Ken Li, Yi-Siang Shih, Chun-Wei Chen

  Dec. 2015, ADVANCED MATERIALS, 27(47) (47), 7809 - 7815, English

  [Refereed]

  Scientific journal

• Exciton Properties in Monolayer-MoSe2/SWCNT Mixed-Dimensional Heterostructures

  Yih-Ren Chang, Nan Fang, Chee Fai Fong, Ufuk Erkilic, Shun Fujii, Yuichiro K. Kato

  The 16th International Conference on Recent Progress in Graphene and 2D Materials Research (RPGR2025), Nov. 2025

  Poster presentation


• Exciton Dynamics in Monolayer-MoSe2/SWCNT Mixed-Dimensional Heterostructures

  Yih-Ren Chang, Nan Fang, Chee Fai Fong, Ufuk Erkilic, Shun Fujii, Yuichiro K. Kato

  The 69th Fullerenes-Nanotubes-Graphene General Symposium, Sep. 2025

  Poster presentation


• Optical properties of mixed-dimensional van der Waals heterostructures

  Yih-Ren Chang

  FNTG 14th Young Researcher Symposium, Sep. 2025

  [Invited]

  Nominated symposium


• Exciton Behaviors in Monolayer MoSe2-SWCNT Mixed-Dimensional Heterostructures

  Yih-Ren Chang, Nan Fang, Chee Fai Fong, Ufuk Erkilic, Shun Fujii, Yuichiro K. Kato

  The 25th International Conference on the Science and Applications of Nanotubes and Low-Dimensional Materials, Jun. 2025, English

  Poster presentation


• Shift current exploration in ferroelectric few layer SnS based on a noncentrosymmetric phase

  Yih-Ren Chang, Ryo Nanae, Satsuki Kitamura, Tomonori Nishimura, Takashi Taniguchi, Kenji Watanabe, Kosuke Nagashio

  Graphene week 2023, Sep. 2023, English

  Poster presentation


• Shift current photovoltaic effect originated from non-centrosymmetric β’ –SnS

  Yih-Ren Chang, Tomonori Nishimura, Takashi Taniguchi, Kenji Watanabe, Kosuke Nagashio

  The 83th JSAP Autumn Meeting, Sep. 2022, English

  Oral presentation


• Thermodynamics perspective on 2D materials oxide formation and amelioration

  Yih-Ren Chang, Tomonori Nishimura, Kosuke Nagashio

  2022 MRS spring meeting, May 2022, English

  Poster presentation


• Thermodynamics perspective to surface oxide amelioration in 2D devices

  Yih-Ren Chang, Tomonori Nishimura, Kosuke Nagashio

  The 82th JSAP Autumn Meeting, Sep. 2021, English

  Oral presentation


• High performance SnS/h-BN heterostructure p-FET via Ti contact reaction

  Yih-Ren Chang, Takashi Taniguchi, Kenji Watanabe, Tomonori Nishimura, Kosuke Nagashio

  2021 International Conference on Solid State Devices and Materials, Sep. 2021, English

  Oral presentation


• Atomic-Step-Induced Screw-Dislocation-Driven Spiral Growth of PVD SnS”, 2021 virtual MRS spring meeting

  Yih-Ren Chang, Chien-Ju Lee, Tomonori Nishimura, Wen-Hao Chang, Kosuke Nagashio

  MRS Spring Meeting, Apr. 2021, English

  Oral presentation


• Mobility enhancement of p-SnS/h-BN heterostructure FET by Ti contact reaction

  Yih-Ren Chang, Takashi Taniguchi, Kenji Watanabe, Tomonori Nishimura, Kosuke Nagashio

  The 68th JSAP Spring Meeting, Mar. 2021, English

  Oral presentation


• Atomic step induced spiral growth in PVD SnS

  Yih-Ren Chang, Naoki Higashitarumizu, Hayami Kawamoto, Tomonori Nishimura, Kosuke Nagashio

  The 81th JSAP Autumn Meeting, Sep. 2020, English

  Oral presentation


• Screw dislocation driven spiral growth in SnS initiated by atomic graphene steps

  Yih-Ren Chang, Naoki Higashitarumizu, Hayami Kawamoto, Fu-Hsien Chu, Chien-Ju Lee, Tomonori Nishimura, Wen-Hao Chang, Kosuke Nagashio

  2020 International Conference on Solid State Devices and Materials, Sep. 2020, English

  Oral presentation


• PVD growth of AA stacking SnS through screw dislocation induced by substrate edge steps

  Yih-Ren Chang, Hayami Kawamoto, Naoki Higashitarumizu, Tomonori Nishimura, Kosuke Nagashio

  The 67th JSAP Spring Meeting, Mar. 2020, English

  Oral presentation


• Contact engineering of high performance tri-layer indium selenide (InSe) field effect transistors: metal deposition induced surface oxide reduction

  Yih-Ren Chang, Raman Sankar, Fang-Cheng Chou, Wei-Hua Wang

  The 10th International Conference on Research Progress in Graphene and 2D Materials Research, Oct. 2019, English

  Poster presentation


• Air stable n-type black phosphorus transistor with photoactive doping layer

  Yih-Ren Chang, Po-Hsun Ho, Min-Ken Li, Raman Sankar, Fu-Yu Shih, Shao-Sian Li, Wei-Hua Wang, Fang-Cheng Chou, Chun-Wei Chen

  Graphene Conference 2017, Mar. 2017, English

  Oral presentation


• Clean-lifting transfer of large-area residual-free graphene films

  Yih-Ren Chang, Chien-Hsun Chuang, Di-Yan Wang, I-Sheng Huang, Po-Hsun Ho, Cheng-Han Wu, Jhe-Yi Wang, Chia-Chun Chen, Chun-Wei Chen

  New Diamond and Nano Carbons Conference 2015, May 2015, English

  Poster presentation

• フラーレン・ナノチューブ・グラフェン学会


• 応用物理学会

• 二次元材料デバイスに用いた多環芳香族炭化水素結晶封止層の安定性評価

  CHANG YIHREN

  日本学術振興会, 科学研究費助成事業, 若手研究, 神戸大学, 01 Apr. 2026 - 31 Mar. 2028


• 二次元材料デバイスにおける多環芳香族炭化水素結晶封止層の応用と特性評価

  CHANG YIHREN

  日本学術振興会, 科学研究費助成事業, 研究活動スタート支援, 神戸大学, 31 Jul. 2025 - 31 Mar. 2027


• Optical properties and applications of van der Waals mixed-dimentional heterostructures

  加藤 雄一郎, CHANG YIH-REN

  Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research, Grant-in-Aid for JSPS Fellows, Institute of Physical and Chemical Research, Mar. 2023 - Mar. 2025

  2023年度は、引き続きカーボンナノチューブと二次元物質をファンデルワールス力により融合した異次元ヘテロ構造を形成する手法の開発に取り組み、また、一次元/二次元ヘテロ構造における界面励起子の観測に着手した。 まず、昨年度と同様の手法により、架橋カーボンナノチューブに二次元物質を転写し、ヘテロ構造を作製した。あらかじめ溝を加工した酸化膜付きシリコン基板上に化学気相成長によりカーボンナノチューブを合成し、フォトルミネッセンス顕微分光によりカーボンナノチューブのカイラリティや位置を事前に評価した。所望のカイラリティを有するカーボンナノチューブに対し、アントラセン結晶を媒介物質として利用する手法により二次元物質を転写した。 次に、得られた異次元ヘテロ構造に対して、フォトルミネッセンス顕微分光による評価を実施した。二次元物質とカーボンナノチューブが接合し異次元ヘテロ構造を形成している場合は、カーボンナノチューブの励起子エネルギーが誘電遮蔽により減少することがわかっており、これをフォトルミネッセンス励起分光により検証することで転写条件の最適化を図った。 遷移金属ダイカルコゲナイドの一種であるセレン化タングステンとの異次元ヘテロ構造では、フォトルミネッセンス測定や励起分光により励起子移動が起きていることが明らかになった。また、系統的にカーボンナノチューブのバンドエネルギーを変化させたヘテロ構造を調査したところ、バンドエネルギーの不連続性と相対的な配置が判明したほか、バンドエネルギーが一致した際には共鳴的に励起子移動が起きることを見出した。さらに、バンドギャップの大きいナノチューブとのヘテロ構造について、界面励起子の発光観測に着手した。 二次元物質の架橋カーボンナノチューブ試料上への直接成長については、走査電子顕微鏡やフォトルミネッセンス顕微分光による評価に着手した。