Department of Electrical Engineering and Information Systems, The University of Tokyo
2025年度
学術誌 (Journal)
K. Ito, M. Takenaka, S. Takagi, and K. Toprasertpong, “Wake-up mechanism with de-pinning dynamics in ultrathin Hf0.5Zr0.5O2: understanding frequency and temperature dependences,” IEEE Transactions on Electron Devices (Accepted).
E. Nako, K. Toprasertpong, R. Nakane, M. Takenaka, and S. Takagi, “Reliable operation of FeFET reservoir computing with robustness against interface degradation,” IEEE Transactions on Electron Devices (Accepted).
C.-T. Chen, K. Toprasertpong, T. Irisawa, W. H. Chang, S. Migita, Y. Morita, H. Ota, and T. Maeda, “Excess oxygen modulation through channel thickness scaling and annealing ambient for AlOx-passivated ultrathin InOx FETs,” IEEE Journal of the Electron Devices Society (Accepted).
K. Toprasertpong, T. Mikolajick, S. Datta, Q. Huang, and S. Takagi, “Emerging applications: Neuromorphic computing and reservoir computing,” MRS Bulletin 50, pp. 1-11, Sep. 2025 (Invited).
K. Toprasertpong, R. Suzuki, S.-Y. Min, E. Nako, R. Nakane, M. Takenaka, and S. Takagi, “Physical reservoir computing using ferroelectric Hf1-xZrxO2 devices for efficient temporal data processing: recent progress of materials, devices, and operating modes,” Japanese Journal of Applied Physics 64, p. 090801, Sep. 2025 (Invited).
S. Wahid, K. Toprasertpong, M. Islam, A. Kumar, M. A. Ul Karim, H. Simka, H.-S. Philip Wong, and E. Pop, “Role of oxygen deficiencies on the stability of indium tin oxide transistors,” IEEE Electron Device Letters 46, pp. 1533-1556, Sep. 2025. (Editor’s Picks).
S. Inoue, Y. Ukezeki, N. Fujimura, K. Toprasertpong, S. Takagi, and T. Yoshimura, “Evaluation of analog memory characteristics using HfO2-based ferroelectric thin films,” Japanese Journal of Applied Physics 64, p. 08SP20, Aug. 2025.
Y. Ukezeki, S. Inoue, N. Fujimura, T. Yokomatsu, K. Kanda, K. Maenaka, K. Toprasertpong, S. Takagi, and T. Yoshimura, “Data processing capability of ferroelectric polarization dynamics in ferroelectric transistor-based physical reservoir computing,” Applied Physics Express 18, p. 081001, Aug. 2025.
Y. Miyatake, T. Anda, Y. Wakita, K. Makino, S. Hatayama, M. Okano, K. Toprasertpong, S. Takagi, and M. Takenaka, “Low-loss Sb2S3 optical phase shifter enabled by optimizing sputtering conditions,” Optical Materials Express 15, pp. 1972-1986 (2025).
S. Wahid, K. Toprasertpong, M. Islam, A. Kumar, M. A. Ul Karim, H. Simka, H.-S. Philip Wong, and E. Pop, “Role of oxygen deficiencies on the stability of indium tin oxide transistors,” IEEE Electron Device Letters, (Accepted).
R. Suzuki, R. Nakane, E. Nako, M. Takenaka, K. Toprasertpong, and S. Takagi, “Proposal of reservoir computing using ferroelectric CMOS circuit,” Applied Physics Express 18, p. 061002, Jun. 2025.
C. Chai, R. Tang, M. Okano, K. Toprasertpong, S. Takagi, and M. Takenaka, “Scalable intensity-based photonic matrix-vector multiplication processor using single-wavelength time-division-multiplexed signals,” Optics Letters 50, pp. 3656-3659, Jun. 2025.
R. Tang, M. Okano, C. Zhang, K. Toprasertpong, S. Takagi, and M. Takenaka, “Waveguide-multiplexed photonic matrix-vector multiplication processor using multiport photodetectors,” Optica 12, pp. 812-820, Jun. 2025.
S. Takagi, M. Takenaka, and K. Toprasertpong, “Prospects and challenges of HfO2-based ferroelectric devices," SCIENCE CHINA Information Sciences 62, p. 160407, Jun. 2025.
Q.-T. Zhao, Y. Han, H.-C. Han, L. Schreiber, T.-E. Lee, N. Chiang, I. Radu, C. Enz, C. Stampfer, S. Takagi, J. Knoch, and D. Grützmacher, “Ultra-low Power Cryogenic CMOS for Advanced Energy-Efficient Computing”, Nature Reviews Electrical Engineering 2, pp. 277–290, Apr. 2025.
国際会議 (International Conference)
K. Toprasertpong, K. Ito, Z. Cai, K. Tahara, M. Takenaka, and S. Takagi, “Pathway for ferroelectric memory with low voltage operation using ultra-thin Hr0.5Zr0.5O2,” IEEE Non-Volitle Memory Technology Symposium (NVMTS), Atlanta, GA, USA, Sep 29-Oct. 1, 2025 (Invited talk).
S. Takagi, X. Han, C.-T. Chen, K. Sumita, M. Takenaka, and K. Toprasertpong, “Carrier mobility enhancement of extremely-thin body Ge-On-Insulator (GOI) MOSFETs,” International Conference on Solid State Devices and Materials (SSDM) 2025, Yokoyhama, Japan, Sep. 15-18, 2025 (Invited talk).
R. Shimura, E. Nako, K. Matsumoto, A. Suzuki, H. Yamamoto, K. Matsukawa, M. Takenaka, S. Takagi, and K. Toprasertpong, “Interface trap density evaluation of off-angle Si(110)/SiO2 interface: Toward understanding of interface properties in advanced MOSFET,” International Conference on Solid State Devices and Materials (SSDM) 2025, Yokoyhama, Japan, Sep. 15-18, 2025.
Z. Liu, Z. Cai, M. Takenaka, S. Takagi, and K. Toprasertpong, “Impact of program condition and wake-up on charge distribution and imprint behaviors in Hf0.5Zr0.5O2 ferroelectric capacitors,” International Conference on Solid State Devices and Materials (SSDM) 2025, Yokoyhama, Japan, Sep. 15-18, 2025.
X. Gao, Z. Cai, Z. Liu, Z. Jin, X. Han, Y.-K. Liang, Y. Chen, E. Nako, S.-Y. Min, M. Takenaka, S. Takagi, and K. Toprasertpong, “Evaluation of polarization-induced interface degradations in FeFETs using quasi-static split C-V techniques: comparison of oxide-semiconductor and Si channels,” International Conference on Solid State Devices and Materials (SSDM) 2025, Yokoyhama, Japan, Sep. 15-18, 2025.
C. Zhang, R. Tang, M. Okano, K. Toprasertpong, S. Takagi, and M. Takenaka, “4-port evanescently coupled waveguide Ge-on-Si photodetector with high saturation current and high bandwidth,” International Conference on Solid State Devices and Materials (SSDM) 2025, Yokoyhama, Japan, Sep. 15-18, 2025.
C.-T. Chen, K. Toprasertpong, T. Irisawa, W. H. Chang, S. Migita, Y. Morita, H. Ota, and T. Maeda, “Electrical characteristics improvement and Vth modification in ultrathin InOx FETs with AlOx-Interlayer/HfOx gate stack,” International Conference on Solid State Devices and Materials (SSDM) 2025, Yokoyhama, Japan, Sep. 15-18, 2025.
T. Akazawa, R. Tang, Y. Miyatake, M. Okano, K. Toprasertpong, S. Takagi, and M. Takenaka, “Phase-error-correctable 4×4 programmable photonic integrated circuit enabled by dual-functional Si PIN waveguides as phase shifter and transparent in-line power monitor,” 2025 European Conference on Optical Communication (ECOC), Copenhagen, Denmark, Sep. 28-Oct. 2, 2025.
H. Sakumoto, K. Toprasertpong, S. Takagi, and M. Takenaka, “Efficient InGaAsP MOSCAP microring optical modulator on III-V membrane platform,” 2025 European Conference on Optical Communication (ECOC), Copenhagen, Denmark, Sep. 28-Oct. 2, 2025.
M. Takenaka, R. Tang, Y. Miyatake, T. Akazawa, H. Sakumoto, Y. Wakita, D. I. Bhardwaj, K. Kobayashi, K. Makino, S. Hatayama, M. Okano, K. Toprasertpong, and S. Takagi, “Non-volatile optical phase shifters for photonic computing,” 30th OptoElectronics and Communications Conference/International Conference on Photonics in Switching and Computing 2025 (OECC/PSC 2025), ME3-1, Sapporo, Japan, Jun. 29- Jul. 3, 2025 (Invited).
J. Pan, H. Sakumoto, T. Akazawa, K. Toprasertpong, S. Takagi, and M. Takenaka, “InP membrane waveguide with SiN rib for active-passive integration,” 30th OptoElectronics and Communications Conference/International Conference on Photonics in Switching and Computing 2025 (OECC/PSC 2025), M3-3, Sapporo, Japan, Jun. 29- Jul. 3, 2025.
S. Takagi, Z. Cai, S.-K. Cho, M. Takenaka, and K. Toprasertpong, “Memory window narrowing in HfZrO2/Si FeFETs: physical origins, challenges, and mitigation strategies,” 83rd Device Research Conference (DRC 2025), No. 16, Durham, NC, USA, Jun. 22-25 (Invited).
K. Ito, M. Takenaka, S. Takagi, and K. Toprasertpong, “Revealing wake-up mechanism in ultra-thin ferroelectric HZO: Domain de-pinning triggered by oxygen vacancy annihilation exhibiting optimal wake-up frequency,” 2025 Symposia on VLSI Technology and Circuits, T11-1, Kyoto, Japan, Jun. 8-12, 2025.
H. Sakumoto, T. Piyapatarakul, K. Toprasertpong, S. Takagi, and M. Takenaka, “Low-loss, low-power InP membrane MOSCAP optical phase shifter,” Compound Semiconductor Week 2025 (CSW2025), Alberta, Canada, May 26-30, 2025.
H. Mori, K. Komatsu, T. Akazawa, H. Sakumoto, Y. Wakita, K. Toprasertpong, S. Takagi, and M. Takenaka, “Numerical analysis of InGaAsP plasmonic electro-absorption modulator,” Compound Semiconductor Week 2025 (CSW2025), Alberta, Canada, May 26-30, 2025.
M. Takenaka, R. Tang, Y. Miyatake, C. Chai, T. Akazawa, H. Sakumoto, Y. Wakita, D. I. Bhardwaj, K. Komatsu, K. Kobayashi, K. Makino, J. Tominaga, N. Miyata, M. Okano, S. Monfray, F. Boeuf, K. Toprasertpong, and S. Takagi, “Heterogeneous Integration for Programmable Photonic Integrated Circuits,” Conference on Lasers and Electro-Optics (CLEO2024), Long Beach, CA, USA, May. 4-9, 2025 (Invited).
C. Chai, R. Tang, M. Okano, K. Toprasertpong, S. Takagi, and M. Takenaka, “Single-wavelength incoherent photonic matrix-vector multiplication circuit based on time division multiplexing,” Conference on Lasers and Electro-Optics (CLEO2024), Long Beach, CA, USA, May. 4-9, 2025.
R. Tang, M. Okano, C. Zhang, K. Toprasertpong, S. Takagi, and M. Takenaka, “High-saturation-current waveguide-coupled Ge-on-Si photodetector fabricated by a standard foundry process for RF applications,” Conference on Lasers and Electro-Optics (CLEO2025), Long Beach, CA, USA, May. 4-9, 2025.
T. Akazawa, S. Monfray, F. Bouef, K. Toprasertpong, S. Takagi, and M. Takenaka, “Optical power monitoring of a 2×2 Mach–Zehnder interferometer using low-doped Si waveguide,” Conference on Lasers and Electro-Optics (CLEO2025), Long Beach, CA, USA, May. 4-9, 2025.
C.-T. Chen, K. Toprasertpong, T. Irisawa, W. H. Chang, S. Migita, Y. Morita, H. Ota, and T. Maeda, “Impact of channel thickness and annealing ambient on electrical characteristics of ultrathin body AlOx-passivated InOx FETs,” 2025 International Symposium on VLSI Technology, Systems and Applications (VLSI-TSA 2025), T13-2, Hsinchu, Taiwan, Apr. 21-24, 2025.
C. Zhang, Z. Zhao, R. Tang, K. Toprasertpong, S. Takagi, and M. Takenaka, “Germanium microring avalanche photodetector for 2 μm wavelengths,” 2025 IEEE Silicon Photonics Conference, ThB2, London, England, Apr. 14-17, 2025.
K. Kobayashi, Y. Miyatake, R. Tang, K. Makino, J. Tominaga, N. Miyata, M. Okano, K. Toprasertpong, S. Takagi, and M. Takenaka, “Non-volatile Si microring resonator switch with Ge2Sb2Te3S2 optical intensity modulator,” 2025 IEEE Silicon Photonics Conference, ThC4, London, England, Apr. 14-17, 2025.
C.-T. Chen, T. Irisawa, S. Migita, K. Toprasertpong, Y. Morita, H. Ohta, and T. Maeda, “Impact of hydrogen incorporation on performance and PBS instability of ultrathin ALD-InOx FETs,” 2025 IEEE International Reliability Physics Symposium (IRPS), P51.PI, Monterey, CA, USA, Mar. 30-Apr 3, 2025.
国内学会 (Japanese Domestic Conference)
トープラサートポン カシディット，閔信義，名幸瑛心，中根了昌，竹中充，高木信一，“Harnessing rich polarization dynamics in antiferroelectric Hf1-xZrxO2 for reservoir computing”，『第42回強誘電体会議』，13pm-15S，京都，2025年6月11-14日（招待講演）．
井上颯太，請関優，トープラサートポン カシディット，高木信一，吉村 武，「Evaluation of analog memory characteristics using HfO2-based ferroelectric thin films」，『第42回強誘電体会議』，14am-05，京都，2025年6月11-14日．