Selective deposition of catalyst nanoparticles using the gravitational force for carbon nanotubes interconnect |
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Authors: | Do-Yoon Kim Jong-Hak Lee Prashant S Alegaonkar In-Taek Han Yong-Wan Jin Kee-Won Kwon |
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Affiliation: | a Center for Nanotubes and Nanostructured Composites, Sungkyunkwan University, 300 Chunchun-dong, Jangan-Gu, Suwon, 440-746, South Korea b Samsung Advanced Institute of Technology, Mt. 14-1, Nongseo-dong, Giheung-gu, Younggin-si Gyunggi-do, 449-712, South Korea c Department of Semiconducting System, Sungkyunkwan University, South Korea |
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Abstract: | The photolithography process has generally been used for the making of catalyst layers used for the synthesis of CNTs due to its comparative ease. However, this method results in the formation of undesirable catalyst particles, which deteriorate the quality of the devices. Therefore, we tried to form a catalyst layer without using any lift-off or wet etching process, especially for the formation of carbon nanotube interconnects. After spin coating the samples, which were previously fabricated with several vias, with an iron-acetate solution, the catalyst layer was pulled down into the bottom of the holes through the force of gravity. We were able to remove the catalyst layer which was coated over undesirable areas, by TMAH (tetramethylammonium hydroxide, N(CH3)4OH) treatment. After the catalyst deposition process, we synthesized CNTs and observed them by scanning electron microscopy (SEM). |
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Keywords: | CNT interconnect Iron acetate Chemical vapor deposition (CVD) |
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