Pacific Rim Symposium on Surfaces, Coatings and Interfaces (PacSurf 2018)
    Thin Films Monday Sessions
       Session TF-MoM

Paper TF-MoM3
The Study on Flash Light Sintering Characteristics of Printed Copper Pattern Electrodes with Respect to their Width and Interval

Monday, December 3, 2018, 8:40 am, Room Naupaka Salons 4

Session: Nanostructured Surfaces and Thin Films: Synthesis and Characterization I
Presenter: Yong-Rae Jang, Hanyang University, Seoul, Korea
Authors: Y.R. Jang, Hanyang University, Seoul, Korea
H.-S. Kim, Hanyang University, Seoul, Korea
C.H. Ryu, Hanyang University, Seoul, Korea
Y.T. Hwang, Hanyang University, Seoul, Korea
Correspondent: Click to Email
In this work, copper nano/micro-ink screen-printed on a polyimide (PI) substrate, were sintered by flash light irradiation. To find out the effects of the pattern width and interval between copper patterns on the flash light sintering characteristics, analytical thermal transfer simulation was conducted by finite difference method, where the temperature of the substrate and electrodes during the flash light irradiation could be predicted. The copper nano/micro-ink was printed with different widths and intervals and sintered via flash light. The flash white light irradiation conditions such as pulse duration, frequency, and number of pulses were optimized on each pattern sizes. To investigate the macrostructure of the copper pattern, optical microscope and alpha step were used. The microstructures of the copper pattern were observed using scanning electron microscope (SEM). Also, in-situ resistance monitoring was conducted to find the tendency of the sintering characteristics according to the Cu printed pattern. From the study, it was confirmed that the heat generated in the copper pattern by flash light irradiation, was dramatically increased as the pattern width becomes wider and the pattern interval becomes narrower. It is noticeable that the flash light irradiation condition should be designed considering the size of the pattern due to pattern dependent heat transfer phenomena.