Evaluation of high temperature reliability of SiC die attached structure with sinter micron-size Ag particles paste on Ni-P/Pd/Au plated substrates

C. Chen, Z. Zhang and K. Suganuma, "Evaluation of high temperature reliability of SiC die attached structure with sinter micron-size Ag particles paste on Ni-P/Pd/Au plated substrates," 2020 IEEE 8th Electronics System-Integration Technology Conference (ESTC), Tønsberg, Vestfold, Norway, 2020, pp. 1-5, doi: 10.1109/ESTC48849.2020.9229850

Real-Time acoustic emission monitoring of wear-out failure in sic power electronic devices during power cycling tests

C. Choe, C. Chen, S. Nagao and K. Suganuma, "Real-Time Acoustic Emission Monitoring of Wear-Out Failure in SiC Power Electronic Devices During Power Cycling Tests," in IEEE Transactions on Power Electronics, vol. 36, no. 4, pp. 4420-4428, April 2021, doi: 10.1109/TPEL.2020.3024986

Hazy Transparent Cellulose Nanopaper

Hsieh, MC., Koga, H., Suganuma, K. et al. Hazy Transparent Cellulose Nanopaper. Sci Rep 7, 41590 (2017). https://doi.org/10.1038/srep41590

Thermal evaluation of metalized ceramic substrates for use in next-generation power modules toward international standardization

N. Wakasugi, C. Chen, K. Hirao, S. Nagao and K. Suganuma, "Thermal evaluation of metalized ceramic substrates for use in next-generation power modules toward international standardization," 2020 IEEE 8th Electronics System-Integration Technology Conference (ESTC), Tønsberg, Vestfold, Norway, 2020, pp. 1-4, doi: 10.1109/ESTC48849.2020.9229827

Facile fabrication of stretchable Ag nanowire/polyurethane electrodes using high intensity pulsed light

Silver nanowires (AgNWs) have emerged as a promising nanomaterial for next generation stretchable electronics. However, until now, the fabrication of AgNW-based components has been hampered by complex and time-consuming steps. Here, we introduce a facile, fast, and one-step methodology for the fabrication of highly conductive and stretchable AgNW/polyurethane (PU) composite electrodes based on a high-intensity pulsed light (HIPL) technique. HIPL simultaneously improved wire-wire junction conductivity and wire-substrate adhesion at room temperature and in air within 50 mu s, omitting the complex transfer-curing-implanting process. Owing to the localized deformation of PU at interfaces with AgNWs, embedding of the nanowires was rapidly carried out without substantial substrate damage. The resulting electrode retained a low sheet resistance (high electrical conductivity) of <10 Omega/sq even under 100% strain, or after 1,000 continuous stretching-relaxation cycles, with a peak strain of 60%. The fabricated electrode has found immediate application as a sensor for motion detection. Furthermore, based on our electrode, a light emitting diode (LED) driven by integrated stretchable AgNW conductors has been fabricated. In conclusion, our present fabrication approach is fast, simple, scalable, and cost-efficient, making it a good candidate for a future roll-to-roll process

Uniformly connected conductive networks on cellulose nanofiber paper for transparent paper electronics

We demonstrate the fabrication of highly transparent conductive networks on a cellulose nanofiber paper, called cellulose nanopaper. Uniform coating of the conductive nanomaterials, such as silver nanowires (AgNWs) and carbon nanotubes, is achieved by simple filtration of their aqueous dispersions through the cellulose nanopaper, which acts as both filter and transparent flexible substrate. The as-prepared AgNW networks on the nanopaper offer sheet resistance of 12Xsq.Ω1 with optical transparency of 88%, which is up to 75 times lower than the sheet resistance on a polyethylene terephthalate film prepared by conventional coating processes. These results indicate that the 'filtration coating' provides uniformly connected conductive networks because of drainage in the perpendicular direction through paper-specific nanopores, whereas conventional coating processes inevitably cause self-aggregation and uneven distribution of the conductive nanomaterials because of the hard-to-control drying process, as indicated by the well-known coffee-ring effect. Furthermore, the conductive networks are embedded in the surface layer of the nanopaper, showing strong adhesion to the nanopaper substrate and providing foldability with negligible changes in electrical conductivity. This filtration process is thus expected to offer an effective coating approach for various conductive materials, and the resulting transparent conductive nanopaper is a promising material for future paper electronics.Koga, H., Nogi, M., Komoda, N. et al. Uniformly connected conductive networks on cellulose nanofiber paper for transparent paper electronics. NPG Asia Mater 6, e93 (2014). https://doi.org/10.1038/am.2014.9

Introduction to printed electronics

This book describes in detail modern technologies for printed electronics, explaining how nanotechnology and modern printing technology are merging to revolutionize electronics fabrication of thin, lightweight, large, and inexpensive products. Readers will benefit from the explanations of materials, devices and circuits used to design and implement the latest applications of printed electronics, such as thin flexible OLED displays, organic solar cells, OLED lighting, smart wallpaper, sensors, logic, memory and more