Session 8: Direct Write & 3D Printing I
Toward the Fabrication of Electronic Circuits without using Surface Mounted Components
Wednesday, February 14, 2018
10:25 AM - 10:50 AM
Conventional electronic circuits consist of surface mounted components containing bare IC chips internally wire-bonded to the lead-frame of a package which is then solder-connected onto circuitization a printed circuit board (PCB). Direct-write printing methods offer the opportunity to additively fabricate the circuitization and interconnects needed to replace wire-bonds and solder connected packages. Electrical interconnects can be printed directly onto the pads of a bare IC chip and seamlessly connected to circuitization that can also be fabricated using the same direct-write printing methods. Furthermore, other circuit components such as resistors, capacitors and inductors can be fabricated and/or connected to printed circuitization using similar methods. The fabrication of such printed hybrid electronics (PHE) requires the ability to direct-write print both circuitization and interconnects along with creating smooth transitions onto and off different surfaces containing the needed electrical connections. Such smooth transitions between surfaces at different levels can be fabricated by printing a structural feature (referred to as a fillet) along the edge of the bare die. It is also possible to fabricate resistors, inductors and capacitors. The fabrication of all of these features and devices requires the ability to precisely print a known and controllable volume of material at specific positions. The fabrication of structural features will be presented and discussed in detail. The fabrication of circuit components that can be embedded /integrated into the fabrication of direct-write printed electronic circuits will also be presented.
Yuan Gu is a postdoctoral researcher in the Department of Mechanical Engineering, University of Maryland. He received his B.S. in in Metallurgy Engineer from University of Science and Technology Beijing (2009) and M.S. in Physical Chemistry of Metallurgy from General Research Institute for Nonferrous Metals (2012) in China. He then moved to United States to get his Ph.D. in Materials Science and Engineering from New Jersey Institute of Technology (2016).
His Master’s research focused on the solid state method to synthesize cathode materials for lithium ion batteries. His Ph.D. research was in the area of synthesis of conductive inks for inkjet printing, printable sensors and flexible batteries under the guidance of Prof. John Federici. During his Ph.D. he received a Graduate Student Award from the New Jersey Inventors Hall of Fame (NJIHoF). He joined in the University of Maryland in 2016. He currently works in the Laboratory for Physical Sciences (LPS) focusing on ink characterizations, printing electronics on curved surfaces and Circuits without using Surface Mounted Components.
Laboratory for Physical Sciences