Synthesis of methyl boron nitride film as low-k insulating film for LSI interconnection |
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Authors: | Hidemitsu Aoki Shinji Tokuyama Takuro Masuzumi Makoto Hara Motaharu Kabir Mazumder Daisuke Watanabe Chiharu Kimura Takashi Sugino |
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Affiliation: | Division of Electrical, Electronic and Information Engineering, Osaka University, 2-l Yamadaoka, Suita, Osaka 565-0871, Japan |
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Abstract: | Low dielectric constant (k) materials for the ULSI interconnect insulator are required to meet the fast development of high-speed devices. We have investigated low-k material of boron nitride containing methyl (methyl boron nitride) by using tris-di-methyl-amino-boron (TMAB) gas. The dielectric constant (k) of the film decreases with decreasing RF plasma power and the k value of the methyl BN film can be achieved as low as 1.8 at 10 W RF plasma power.Absorption band of the film was observed at 2960 cm? 1 due to unsymmetrical stretching mode of C–H in CH3. It is thought that increasing C–H bond with low polarizability and reducing C N bond with high polarizability can realize a lower k value. The film has also high resistivity of more than 1 × 109 Ω cm and sufficient Young modulus of more than 26 GPa for the interlayer of LSI interconnection. There is a possibility that the dielectric constant can be decreased keeping the BN structure with high strength. The methyl BN film is an extremely attractive material as low-k material of next generation devices. |
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