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Moisture uptake and dielectric property of methylsilsesquioxane/high-temperature porogen hybrids and porous low-k films

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Abstract

Two high-temperature pore generators (porogens) have been used to study the effect of porogen structure on moisture uptake and k-value in methylsilsesquioxane/porogen hybrid films and their corresponding porous films in a postintegration porogen removal scheme. Poly(styrene-b-4-vinylpyridine) containing di-block structure and pyridine polar group leads to higher moisture uptake and k-value in the hybrid films as compared to poly(styrene-block-butadiene-block-styrene) with symmetrical structure and nonpolar groups. Moreover, the moisture uptake behavior in both as-prepared hybrid films is in physical sorption mode based on their reversible adsorption-desorption curve measured by quartz crystal microbalance. After porogen removal, the k-values of porous films are favorably not influenced by porogen structures, and their moisture uptake is as low as 1.78 wt% even at 40 vol.% porosity. However, based on the simulation of the modified-Rayleigh model, the porous films are found to possess 0.4 vol.% chemisorbed moisture on the pore surface, resulting in 17-23% deviation from the ideal k-values.

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Authors and Affiliations

  1. Department of Materials Science and Engineering, National Chiao Tung University, Taiwan, 30010, China

    Mu-Lung Che, Jun-Yuan Teng, Po-Cheng Lai & Jihpemg Leu

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  1. Mu-Lung Che
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Che, ML., Teng, JY., Lai, PC. et al. Moisture uptake and dielectric property of methylsilsesquioxane/high-temperature porogen hybrids and porous low-k films. Journal of Materials Research 26, 2987–2995 (2011). https://doi.org/10.1557/jmr.2011.384

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