Atomic beam-induced fluorination of polyimide and its application to site-selective Cu metallization |
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Authors: | Tagawa Masahito Maeda Ken-ichi Kajita Tadashi Yokota Kumiko Akamatsu Kensuke Nawafune Hidemi |
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Institution: | Faculty of Engineering, Kobe University, Rokko-dai 1-1, Nada, Kobe 657-8501 Japan. tagawa@mech.kobe-u.ac.jp |
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Abstract: | Metallization methods of polyimide by hyperthermal atomic oxygen and atomic fluorine beams were developed. An atomic fluorine beam with a translational energy of 6.2 eV modified the wettability of polyimide surfaces to provide an advancing water contact angle of 132 degrees. It was confirmed that in-air storage for 2 months did not alter the hydrophobic property created by the atomic fluorine beam. This stable beam-induced surface fluorination technique was then applied to site-selective electroless Cu plating on polyimide. It was demonstrated that changing the exposure sequence could create both positive- and negative-type plating processes. |
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