Presentation 2025

• Realizing a High External Quantum Efficiency of 0.44% in 232 nm AlGaN-based far-UVC LED by Suppressing Relaxation in n-AlGaN Layer Via Homoepitaxy
  Muhammad Ajmal Khan, Hiromitsu Sakai, M. Nawaz Sharif, Arata Sasaki, Amina Yasin, Yuya Nagata, Yukio Kashima, Mitsuhiro Muta, Yasushi Iwaisako, Hiroyuki Yaguchi, Hideki Hirayama
  15th International Conference on Nitride Semiconductors (ICNS 15) (OD-Mon-P4) (Malmö, Sweden)
  July 7, 2025
• Experimental and Theoretical Insights into the Relaxed or Strained 230 nm far-UVC LEDs as a Function of Quantum-Well Numbers
  M. Nawaz Sharif, Hiromitsu Sakai, Kohei Fujimoto, Yuya Nagata, Hiroyuki Yaguchi, Muhammad Ajmal Khan, Hideki Hirayama
  15th International Conference on Nitride Semiconductors (ICNS 15) (OD-Tue-4) (Malmö, Sweden)
  July 8, 2025
• Nanoscopic Insights into the Structural and Optical Properties of a Far-UVC-LED: Detailed Characterization of Carrier Capture in Active Region
  Frank Bertram, Gordon Schmidt, Peter Veit, Juergen Christen, M. Ajmal Khan, Kohei Fujimoto, Yuya Nagata, Hiroyuki Yaguchi, Hideki Hirayama
  15th International Conference on Nitride Semiconductors (ICNS 15) (OD-Tue-18A) (Malmö, Sweden)
  July 8, 2025
• Polarisation Assisted n-AlGaN Electron Injection Layer in 229 nm far-UVC LEDs for Hole Blocking and Current Density Enhancement
  Muhammad Ajmal Khan, Hiromitsu Sakai, M. Nawaz Sharif, Yuya Nagata, Kohei Fujimoto, Amina Yasin, Mitsuhiro Muta, Yasushi Iwaisako, Hiroyuki Yaguchi, Hideki Hirayama
  15th International Conference on Nitride Semiconductors (ICNS 15) (OD-Tue-20A)(Malmö, Sweden)
  July 8, 2025
• Highly Reflective and Conductive a New Ni/Al/Au p-electrode for 292 nm UVB LED on C-plane Sapphire
  Hamida Zia, Amina Yasin, Fujimoto Kohei, Nagata Yuya, Yaguchi Hiroyuki, Muhammad Ajmal Khan, Hirayama Hideki
  15th International Conference on Nitride Semiconductors (ICNS 15) (OD-Tue-P3) (Malmö, Sweden)
  July 8, 2025
• Above Room Temperature Optical Gain in 3-15 THz Range GaN/AlGaN Quantum-Cascade Laser obtained by NEGF Analysis
  Koki Yabe, Airu Takahashi, Akira Kaneko, Li Wang, Ke Wang, Sachie Fujikawa, Krishan Kumar, Shashank Mishra, Thomas Grange, Stefan Birner, Hiroyuki Yaguchi, Hideki Hirayama
  15th International Conference on Nitride Semiconductors (ICNS 15) (OD-Thu-5) (Malmö, Sweden)
  July 10, 2025
• Marked Enhancement of Optical Gain by Doping for 10 THz-band GaN-based Quantum-Cascade Laser Analyzed by NEGF method
  Airu Takahashi, Koki Yabe, Akira Kaneko, Li Wang, Ke Wang, Sachie Fujikawa, Krishan Kumar, Shashank Mishra, Thomas Grange, Stefan Birner, Hiroyuki Yaguchi, Hideki Hirayama
  15th International Conference on Nitride Semiconductors (ICNS 15) (OD-Thu-P13) (Malmö, Sweden)
  July 10, 2025
• Design and Fabrication of GaN/AlGaN THz Quantum-Cascade Laser Structure on SiC Substrate
  Akira Kaneko, Airu Takahashi, Koki Yabe, Li Wang, Ke Wang, Sachie Fujikawa, Krishan Kumar, Shashank Mishra, Hiroyuki Yaguchi, Hideki Hirayama
  15th International Conference on Nitride Semiconductors (ICNS 15) (OD-Thu-P14) (Malmö, Sweden)
  July 10, 2025
• (In Japanese) Crystallinity evaluation of Ge membrane fabricated using germanium-on-nothing structures
  Wenbo Fan, Shuhei Yagi, Hiroyuki Yaguchi
  第22回「次世代の太陽光発電システム」シンポジウム (第5回⽇本太陽光発電学会学術講演会) (6-4) (Tokyo)
  July 4, 2025
• Growth of Zn doped and Sn modulation doped InSb_1-xN_x thin films by DC/RF magnetron sputtering
  Sachie Fujikawa, Yuto Ariji, and Hiroyuki Yaguchi
  Compound Semiconductor Week 2025 (P8) (Banff, Canada)
  May 28, 2025
• High-performance UVB and Far-UVC LEDs on Sapphire Aiming for Inactivation of Viruses and Bacteria
  Muhammad Ajmal Khan, Mitsuhiro Muta, Hiromitsu Sakai, Yukio Kashima, Hiroyuki Yaguchi, Yasushi Iwaisako, Hideki Hirayama
  46th Photonics and Electromagnetics Research Symposium (PIERS2025) (Abu Dhabi, United Arab Emirates)
  May 6, 2025
• (In Japanese) Analysis of optical gain mapping of GaN THz-QCL considering doping concentration of core layer
  Koki Yabe, Airu Takahashi, Akira Kaneko, Sachie Fujikawa, Hiroyuki Yaguchi, Krishan Kumar, Shashank Mishra, Hideki Hirayama
  The 72nd JSAP Spring Meeting 2025 (14p-K504-4) (Noda, Japan)
  March 14, 2025
• (In Japanese) Heat Stability of Perovskite Solar Cells with Self-Assembled Electron Transport Layer
  Ryusei Emura, Takashi Funaki, Kohei Yamamoto, Naoyuki Nishimura, Hiroyuki Yaguchi, Takurou N. Murakami
  The 72nd JSAP Spring Meeting 2025 (14p-P08-8) (Noda, Japan)
  March 14, 2025
• (In Japanese) Effects of Residual PbI2 on Perovskite Solar Cell’s Performance Using the Stepwise Coating Method
  Seima Ishii, Kohei Yamamoto, Naoto Eguchi, Hiroyuki Yaguchi, Takurou N. Murakami
  The 72nd JSAP Spring Meeting 2025 (14p-P08-18) (Noda, Japan)
  March 14, 2025
• Aluminiumization-Assited Influence on the Crystalline Quality of the AIN Template Grown on c-Sapphire
  Amina Yasin, Yuya Nagata, M. Nawaz Sharif, Hamida Zia, Hiroyuki Yaguchi, M. Ajmal Khan, Hideki Hirayama
  The 72nd JSAP Spring Meeting 2025 (16a-K401-6) (Noda, Japan)
  March 16, 2025
• (In Japanese) Investigation of annealing conditions for forming Germanium-on-Nothing structures
  Wenbo Fan, Ryuji Ohshima, Yasushi Shoji, Takeyoshi Sugaya, Shuhei Yagi, Hiroyuki Yaguchi
  The 72nd JSAP Spring Meeting 2025 (16p-P15-1) (Noda, Japan)
  March 16, 2025