[Invited]Hiroaki Tatsumi, “Cu Ribbon Soldering on Power Module Substrate using Blue Diode Laser”, In 22nd International Symposium on Microelectronics and Packaging joined with the 18th International Conference Reliability and Stress-Related Phenomena in Nanoelectronics (ISMP-IRSP 2024), Paradise Hotel, Busan, Korea, November 5-8, 2024.
Shunya Nitta, Hiroaki Tatsumi, Atsushi Ito, Arimichi Takayama, Hiroshi Nishikawa, “Evaluation of Adsorption Energy by First-Principles Calculation and Application to Composite Solder Alloys”, In The 4th International Symposium on Design & Engineering by Joint Inverse Innovation for Materials Architecture (DEJl2MA2024), Kokukaikan Business Forum, Tokyo, Japan, October 3, 2024.
Shunya Nitta, Hiroaki Tatsumi, and Hiroshi Nishikawa, “Creep Behavior of Low-temperature Sn-In Solder using Nanoindentation Test”, In 2024 IEEE International 3D Systems Integration Conference (3DIC 2024), Sendai, Japan, September 25–27, 2024.
Hiroaki Tatsumi, Shunya Nitta, Atsushi M Ito, Arimichi Takayama, and Hiroshi Nishikawa, “Interfacial energy assessment of Cu/Si3N4 joints for power electronics substrate”, In Commission VII: Microjoining and Nanojoininng, IIW Annual Assembly and International Conference (IIW 2024), Rhodes Palace Hotel, Rhodes, Greece, July 07–12, 2024.
Ichizo Sakamoto, Doojin Jeong, Hiroaki Tatsumi, and Hiroshi Nishikawa, “Joint Strength of Transient Liquid Phase Bonding Using Cu–SAC Molded Sheet”, In 2024 International Conference on Electronics Packaging (ICEP2024), Toyama International Conference Center, Toyama, Japan, April 17-19, 2024.
Hiroaki Tatsumi, Hiroshi Isono, Kana Hirase, Takuya Ide, and Hiroshi Nishikawa, “Low Thermal Resistance Joint using Lotus-type Cu/Solder Composite”, In 2024 International Conference on Electronics Packaging (ICEP2024), Toyama International Conference Center, Toyama, Japan, April 17-19, 2024.
Chuncheng Wang, Hiroaki Tatsumi, and Hiroshi Nishikawa, “Ag Sintered Joints on ENIG Cu Substrates by an Ag-based Complex”, In 2024 International Conference on Electronics Packaging (ICEP2024), Toyama International Conference Center, Toyama, Japan, April 17-19, 2024.
Hiroaki Tatsumi, Yuki Kida, Keisuke Takenaka, Seiji Kaneshita, Yuji Sato, Masahiro Tsukamoto, and Hiroshi Nishikawa, “Microstructure and strength of Sn-Ag-Cu solder joint using blue diode laser”, In TMS2024 153rd Annual Meeting Exhibition, Orlando, USA, March 3-7, 2024.
Jianhao Wang, Shogo Yodo, Hiroaki Tatsumi, and Hiroshi Nishikawa, “Bonding strength of ENIG joint using micro-sized Ag particles with submicron ceramic particles”, In TMS2024 153rd Annual Meeting Exhibition, Orlando, USA, March 3-7, 2024.
2023
Shunya Nitta, Hiroaki Tatsumi and Hiroshi Nishikawa “Tensile strength of Sn-In Eutectic Solder with Surface Modified ZrO2 Nanoparticles”, In The Advanced Materials Research Grand Meeting (MRM2023/IUMRS-ICA2023), Kyoto, Japan, December 11-16, 2023.
Hiroaki Tatsumi and Hiroshi Nishikawa “Enhanced Thermal Conductivity in Micro Composite Structure Joints Utilizing Porous Cu Sheets”, In The 5th International Conference on Nanojoining and Microjoining (NMJ 2023), Leipzig, Germany, November 27-29, 2023.
[Invited]Hiroaki Tatsumi, “Molecular Dynamics Simulation of Cu–Cu Solid-State Bonding Behavior”, In The 2023 Materials Research Society-Taiwan International Conference (2023 MRSTIC), National Tsing Hua University in Hsinchu, Taiwan, November 17-20, 2023.
[Invited]Hiroaki Tatsumi, “High-Thermal-Performance Power Semiconductor Module using Solder/Copper Composite Joints”, In The 3rd International Symposium on Design & Engineering by Joint Inverse Innovation for Materials Architecture (DEJI2MA-3), International Conference Center/Waseda University, October 20, 2023.
Hiroaki Tatsumi, C.R. Kao, and Hiroshi Nishikawa, “Molecular Dynamics Simulation of Cu-Cu Solid-State Bonding under Various Bonding Parameters”, In 2023 International Conference on Electronics Packaging (ICEP2023), Kumamoto City Searshome Yume Hall, April 19-22, 2023.
Xunda Liu, Hiroaki Tatsumi, Zhi Jin, and Hiroshi Nishikawa, “Failure Analysis of Joints Bonded by Ag-In Transient Liquid Phase Process during Shear Test”, In 2023 International Conference on Electronics Packaging (ICEP2023), Kumamoto City Searshome Yume Hall, April 19-22, 2023.
Hiroki Nakawaki, Hiroaki Tatsumi, Chih-han Yang, Shih-kang Lin, and Hiroshi Nishikawa, “The Influence of Bi Content on Joint Properties using Sn-Bi-Zn-In Alloy”, In 2023 International Conference on Electronics Packaging (ICEP2023), Kumamoto City Searshome Yume Hall, April 19-22, 2023.
Seongwoo Pak, Hiroaki Tatsumi, Jianhao Wang, and Hiroshi Nishikawa, “Interfacial Intermetallic Compounds of Bi2Te3/Cu Joint using SAC305 Solder and Nano-Ag Paste”, In 2023 International Conference on Electronics Packaging (ICEP2023), Kumamoto City Searshome Yume Hall, April 19-22, 2023.
Jianhao Wang, Shogo Yodo, Hiroaki Tatsumi, and Hiroshi Nishikawa, “Microstructure and Property of Ag Sintered Joint Doping with AlN Nanoparticles”, In 2023 International Conference on Electronics Packaging (ICEP2023), Kumamoto City Searshome Yume Hall, April 19-22, 2023.
Satoshi Oya, Hiroaki Tatsumi, and Hiroshi Nishikawa, “Significant Consumption of Ni-P Layer in Ni-P/Sn-0.7Cu Solder Joints during Thermomigration”, In 2023 International Conference on Electronics Packaging (ICEP2023), Kumamoto City Searshome Yume Hall, April 19-22, 2023.
Hiroaki Tatsumi and Hiroshi Nishikawa, “Thermal and Mechanical Evaluation of Anisotropic Cu-Solder Composite Joint on High Temperature Storage”, In TMS2023 152nd Annual Meeting Exhibition, San Diego Convention Center & Hilton San Diego Bayfront, March 19, 2023.
Hiroshi Nishikawa, Duy Le Han, and Hiroaki Tatsumi, “Effect of Cu Addition on Mechanical Properties of In-Sn Alloy Before and After Isothermal Aging”, In TMS2023 152nd Annual Meeting Exhibition, San Diego Convention Center & Hilton San Diego Bayfront, March 19, 2023.
Hiroaki Tatsumi, “Nano-materials and nano-structures for assembly of power electronics devises”, In Nano- & Micro-Joining (NMJ) Virtual Meeting, Online, January 25, 2023.
2022
Xunda Liu, Zhi Jin, Hiroaki Tatsumi, and Hiroshi Nishikawa, “Mechanical properties of transient liquid phase bonded joints by using Ag-In sandwich structure”, In 24th Electronics Packaging Technology Conference (EPTC 2022), Singapore, December 7-9, 2022.
Jiahui Li, Hiroaki Tatsumi, and Hiroshi Nishikawa, “Comparative Study of Sn-based Solder Wettability and Interfacial Reactions on Aluminum Substrate”, In Visual-JW 2022, Osaka, October 25-26, 2022.
Duy Le Han, Hiroaki Tatsumi, Fupeng Huo, and Hiroshi Nishikawa, “Effect of isothermal aging on properties of In-48Sn and In-Sn-8Cu alloys”, In 2022 IEEE 72nd Electronic Components and Technology Conference (ECTC), San Diego, May 31 – June 03, 2020.
2020
Hiroaki Tatsumi, Hiroshi Yamaguchi, Tomoki Matsuda, Tomokazu Sano, Yoshihiro Kashiba, and Akio Hirose, “Transient Liquid Phase Sintered Cu-Sn Skeleton Microstructure for Electronics Interconnections”, In Commission VII: Microjoining and Nanojoininng, International Institute of Welding (IIW 2020), online, July 15–25, 2020.
2018
Hiroaki Tatsumi, Adrian Lis, Takeshi Monodane, Hiroshi Yamaguchi, Yoshihiro Kashiba and Akio Hirose, “High-Temperature Reliability of Transient Liquid Phase Sintering Joints Using Copper-Solder-Resin Composite”, In 4th International Conference on Nanojoining and Microjoining 2018 (NMJ2018), Micro Joining Committee of Japan Welding Society, Todaiji Culture Center, Nara, Japan, December 2–5, 2018.
Koji Asama, Hiroaki Tatsumi, Hiroshi Yamaguchi, "Brazing of Aluminium and Stainless Steel using multi-layered composite filler metal", 71st Annual Assembly of International Institute of Welding (IIW2018), IIW, Bali Nusa Dua Convention Center, Bali, Indonesia, July 15–20, 2018.
Hiroaki Tatsumi, Adrian Lis, Takeshi Monodane, Hiroshi Yamaguchi, Yoshihiro Kashiba and Akio Hirose, “Transient Liquid Phase Sintering Using Copper-Solder-Resin Composite for High- temperature Power Modules,” in 2018 IEEE 68th Electronic Components and Technology Conference (ECTC), IEEE, Sheraton San Diego Hotel & Marina, San Diego, USA, May 29–June 1, 2018.
Adrian Lis, Hiroaki Tatsumi, Tomoki Matsuda, Tomokazu Sano, Yoshihiro Kashiba, and Akio Hirose, in Proceedings of the International Conference and Exhibition on High Temperature Electronics (HiTEC), IMAPS, Hotel Albuquerque, Albuquerque, USA, May 8–10, 2018.
2017
K. Nakanishi, Hiroaki Tatsumi, Adrian Lis, Tomoki Matsuda, Tomokazu Sano, Yoshihiro Kashiba and Akio Hirose, “Model Construction for Predicting Effects of Microstructural Mophologies in Sintered Ag Layer on the Joint Strength”, In MATERIALS SCIENCE &TECHNOLOGY 2017 Conference (MS&T17), ACerS et al., David L. Lawrence Convention Center, Pittsburgh, USA, October 8–12, 2017.
2016
Hiroaki Tatsumi, Sho Kumada, Atsushi Fukuda, Hiroshi Yamaguchi and Yoshihiro Kashiba, “Reliability of Silver Sinter Joint for High-Temperature Power Modules”, In 3rd International Conference on Nanojoining and Microjoining 2016 (NMJ2016), University of Waterloo, et al., Crowne Plaza, Niagara Falls, Canada, September 25–28, 2016.
2015
Hiroaki Tatsumi, Sho Kumada, Atsushi Fukuda, Hiroshi Yamaguchi and Yoshihiro Kashiba, “Impact of Metallurgical and Mechanical Properties of Sintered Silver Nanoparticles on Die-attach Reliability of High-temperature Power Modules”, In 48th International Symposium on Microelectronics (IMAPS2015), IMAPS, Rosen Centre Hotel, Orlando, USA, October 26–29, 2015.
2011
Akio Hirose, Naoya Takeda, Hiroaki Tatsumi, Yusuke Akada, Tomo Ogura, Eiichi Ide and T. Morida, Low Temperature Sintering Bonding Process Using Ag Nanoparticles Derived from Ag2O for Packaging of High-temperature Electronics, International Conference on Processing & Manufacturing of Advanced Materials (Thermec '2011), TMS et.al., Quebec, Canada, Aug. 1–5, 2011.
2010
Yosuke Konaka, Naoya Takeda, Hiroaki Tatsumi, Tomo Ogura, Eiichi Ide, Toshiaki Morita and Akio Hirose, Effect of Particle Size on Bondability in Joining Using Silver Nanoparticles, Materials Science & Technology 2010 Conference (MS&T10), ACerS et al., Houston, Texas, USA, Oct. 17–21, 2010.
2009
Naoya Takeda, Hiroaki Tatsumi, Yusuke Akada, Tomo Ogura, Eiichi Ide, Toshiaki Morita, Akio Hirose, Interfacial Bonding Mechanism of Silver Metallo-organic Nanoparticles to Metal Substrates, Materials Science & Technology 2009 Conference (MS&T09), ACerS et al., Pittsburgh, Pennsylvania, USA, Oct. 25–29, 2009.
Naoya Takeda, Hiroaki Tatsumi, Yusuke Akada, Tomo Ogura, Eiichi Ide, Toshiaki Morita and Akio Hirose, “A Novel Metal-to-metal Bonding Process Utilizing Low-temperature Sinterability of Ag2O-derived Ag Nanoparticles”, International Conference on Electronics Packaging 2009 (ICEP2009), JIEP et al., Kyoto, Japan, Apr. 14–16, 2009.
2008
Hiroaki Tatsumi, Naoya Takeda, Yusuke Akada, Tomo Ogura, Toshiaki Morita, Eiichi Ide and Akio Hirose, Bonding Mechanism of Novel Bonding Process Using Ag2O Microparticles via In-situ Formation of Ag Nanoparticles, The 8th International Symposium of the Japan Welding Society (8WS), JWS, Kyoto, Japan, Nov. 16–18, 2008.
Naoya Takeda, Hiroaki Tatsumi, Yusuke Akada, Tomo Ogura, Toshiaki Morita, Eiichi Ide and Akio Hirose, Novel Metal-to-metal Low-temperature Bonding Process by In-situ Formation of Ag Nanoparticles using Ag2O Microparticles, The 8th International Symposium of the Japan Welding Society (8WS), JWS, Kyoto, Japan, Nov. 16–18, 2008.
Akio Hirose Hiroaki Tatsumi, Naoya Takeda, Yusuke Akada, Tomo Ogura, Eiichi Ide and Toshiaki Morita, A Novel Metal-to-Metal Bonding Process through In-situ Formation of Ag Nanoparticles Using Ag2O Microparticles, International Conference on Advanced Stractural and Functional Materials Design 2008 (ICASFMD2008), Osaka University, Osaka, Japan, Nov. 10–12, 2008.
Naoya Takeda, Hiroaki Tatsumi, Yusuke Akada, Tomo Ogura, Toshiaki Morita, Eiichi Ide and Akio Hirose, Evaluation of Bonding Characteristics of Cu/Au-to-Cu/Au joints using Ag2O Particles -Novel Bonding Process using Ag2O Particles (3rd Report)-, Materials Science & Technology 2008 Conference (MS&T08), ACerS et al., Pittsburgh, Pennsylvania, USA, Oct. 5–9, 2008.
Hiroaki Tatsumi, Naoya Takeda, Yusuke Akada, Tomo Ogura, Toshiaki Morita, Eiichi Ide and Akio Hirose, In-situ Formation of Ag Nanoparticles and Bonding Mechanism on Au Substrate -Novel Bonding Process Using Ag2O Particles (2nd Report)-, Materials Science & Technology 2008 Conference (MS&T08), ACerS et al., Pittsburgh, Pennsylvania, USA, Oct. 5–9, 2008.
2007
Hiroaki Tatsumi, Yusuke Akada, Takuto Yamaguchi and Akio Hirose, “Metal-to-Metal Bonding Using Composite Ag Nanoparticles –Effects of Sintering Properties of the Nanoparticles on Bondability-”, The Second International Symposium on Smart Processing Technology (SPT’07), Osaka, Japan, Nov. 27–28, 2007.
Yusuke Akada, Hiroaki Tatsumi, Takuto Yamaguchi, Akio Hirose, Toshiaki Morita and Eiichi Ide, “Investigation of Bonding Mechanism of Ag Nanoparticles to Bulk Metals”, The Second International Symposium on Smart Processing Technology (SPT'07), Osaka, Japan, Nov. 27–28, 2007
Hiroaki Tatsumi, Yusuke Akada, Takuto Yamaguchi and Akio Hirose, “Sintering Mechanism of Composite Ag Nanoparticles and its Application to Bonding Process -Effects of Ag2CO3 Contents on Bondability to Cu-”, The Sixth Pacific Rim International Conference on Advanced Materials and Processing (PRICM6), Jeju Island, Korea, Nov. 5–9, 2007