Heat-Resistant co-w catalytic metals for multilayer graphene chemical vapor deposition

Kazuyoshi Ueno, Yusuke Karasawa, Satoru Kuwahara, Shotaro Baba, Hitoshi Hanai, Yuichi Yamazaki, Naoshi Sakuma, Akihiro Kajita, Tadashi Sakai

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Abstract

Multilayer graphene (MLG) is expected to be a low-resistance and high-reliability interconnect material replacing copper (Cu) in nanoscale interconnects. Chemical vapor deposition (CVD) on catalytic metals is expected as a practical method for MLG deposition. To obtain high-quality MLG films without catalyst agglomeration by CVD, heat-resistant Co-W catalytic metals were investigated. The agglomeration of the Co-W catalytic metals was suppressed by increasing the W composition; however, MLG deposition was suppressed at the same time. The effects of W addition on the MLG growth were discussed from the viewpoints of the crystallographic change of the Co-W catalysts and chemical reactions. It was found that the Co grain size was reduced and the fcc Co formation was suppressed by W addition. In addition, graphite formation was supposed to be suppressed by W addition owing to the formation of phases other than fcc Co according to the Co-W-C phase diagram. With the optimum W concentration, MLG crystallinity was improved by high-temperature CVD using the heat-resistant Co-W catalytic metals (0.7 at. %) without agglomeration, compared with that in the case of using pure-Co catalysts.

Original languageEnglish
Article number04CB04
JournalJapanese Journal of Applied Physics
Volume52
Issue number4 PART 2
DOIs
Publication statusPublished - 2013 Apr 1

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ASJC Scopus subject areas

  • Engineering(all)
  • Physics and Astronomy(all)

Cite this

Ueno, K., Karasawa, Y., Kuwahara, S., Baba, S., Hanai, H., Yamazaki, Y., Sakuma, N., Kajita, A., & Sakai, T. (2013). Heat-Resistant co-w catalytic metals for multilayer graphene chemical vapor deposition. Japanese Journal of Applied Physics, 52(4 PART 2), [04CB04]. https://doi.org/10.7567/JJAP.52.04CB04