Effects of porous carbon additives and induced fluorine on low dielectric constant polyimide synthesized with an e-beam

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• 作者：Ji Sun Im ; Tae-Sung Bae ; Sung Kyu Lee ; Sei-Hyun Lee ; Euigyung Jeong ; Phil Hyun Kang ; Young-Seak Lee
• 关键词：A. Fluorides ; A. Inorganic compounds ; A. Interfaces ; A. Surfaces ; D. Electrical properties
• 刊名：Materials Research Bulletin
• 出版年：2010
• 出版时间：November 2010
• 年：2010
• 卷：45
• 期：11
• 页码：1641-1647
• 全文大小：604 K

文摘

We report the synthesis of a polyimide matrix with a low dielectric constant for application as an intercalation material between metal interconnections in electronic devices. Porous activated carbon was embedded in the polyimide to reduce the dielectric constant, and a thin film of the complex was obtained using the spin-coating and e-beam irradiation methods. The surface of the thin film was modified with fluorine functional groups to impart water resistance and reduce the dielectric constant further. The water resistance was significantly improved by the modification with hydrophobic fluorine groups. The dielectric constant was effectively decreased by porous activated carbon. The fluorine modification also resulted in a low dielectric constant on the polyimide surface by reducing the polar surface free energy. The dielectric constant of polyimide film decreased from 2.98 to 1.9 by effects of porous activated carbon additive and fluorine surface modification.