期刊Conductivities and curing properties of electron-beam-irradiated anisotropic conductive films.pdfVIP

Journal of the Korean Physical Society, Vol. 61, No. 2, July 2012, pp. 282∼285 Conductivities and Curing Properties of Electron-beam-irradiated Anisotropic Conductive Films Tae Gyu Shin Neutron Science Division, Korea Atomic Energy Research Institute, Daejeon 305-353, Korea Inhyuk Lee and Jae yong Kim∗ Department of Physics, Hanyang University, Seoul 133-791, Korea (Received 24 November 2011, in final form 27 March 2012) Radiation-curable acrylated epoxy oligomer was irradiated by using an electron beam (E-beam) with dosages of 5, 10, 20, 40, 80, 200, 400, and 550 kGy to investigate the electrical and the physical properties of anisotropic conductive films (ACFs) and to evaluate the potential application of radiation technology to flip-chip package processing. An ACF is an insulating epoxy matrix containing conducting particles that keep the electrical conductivity along the out-of-plane direction and the insulation property along the in-plane direction. The contact resistance between ACF joints cured by using an E-beam irradiation of 80 kGy was measured under a constant bonding pressure of 2 kgf/cm2 to demonstrate the effects of pad pitch size and the number of added conductive particles in the epoxy resin. Three types of PCBs, 1000-, 500-, and 100-µm pad pitches, were employed while the E-beam curable epoxy resin was mixed with conductive particles in a weight ratio of 10:1. The measured average contact resistance was 0.24 Ω with a minimum of 0