19 March 2015 Directed self-assembly lithography using coordinated line epitaxy (COOL) process
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In this study, half-pitch (HP) 15 nm line-and-space (L/S) metal wires were successfully fabricated and fully integrated on a 300 mm wafer by applying directed self-assembly (DSA) lithography and pattern transfer for semiconductor device manufacturing. In order to evaluate process performances of DSA, we developed a simple sub-15 nm L/S patterning process using polystyrene-block-poly(methyl methacrylate) (PS-b-PMMA) lamellar block copolymer (BCP), which utilizes trimming resist and shallow etching spin-on-glass (SOG) as pinning guide[1]-[4]. From the results of defect inspection after SOG etch using Electron Beam (EB) inspection system, defects were classified as typical DSA defects or defects relating to DSA pattern transfer. From the evaluation of DSA L/S pattern Critical Dimension (CD), roughness and local placement error using CD-SEM, it is considered that isolated PS lines are placed at the centerline between guides and that placement of paired PS lines depends on the guide width. The control of the guide resist CD is the key to local placement error and the paired lines adjacent to the guide shifted toward the outside (0.5 nm) along the centerline of the isolated line after SOG etch. We demonstrated fabrication of HP 15 nm metal wires in trenches formed by the DSA process with reactive ion etching (RIE), followed by metal chemical vapor deposition (CVD) and chemical mechanical polishing (CMP). By SEM observation of alignment errors between the trenches and connect spaces, overlay shift patterns (-4 nm) in guide lithography mask were fabricated without intra-wafer alignment errors.
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Yuriko Seino, Yuriko Seino, Yusuke Kasahara, Yusuke Kasahara, Hironobu Sato, Hironobu Sato, Katsutoshi Kobayashi, Katsutoshi Kobayashi, Hitoshi Kubota, Hitoshi Kubota, Shinya Minegishi, Shinya Minegishi, Ken Miyagi, Ken Miyagi, Hideki Kanai, Hideki Kanai, Katsuyoshi Kodera, Katsuyoshi Kodera, Naoko Kihara, Naoko Kihara, Yoshiaki Kawamonzen, Yoshiaki Kawamonzen, Toshikatsu Tobana, Toshikatsu Tobana, Masayuki Shiraishi, Masayuki Shiraishi, Satoshi Nomura, Satoshi Nomura, Tsukasa Azuma, Tsukasa Azuma, "Directed self-assembly lithography using coordinated line epitaxy (COOL) process", Proc. SPIE 9423, Alternative Lithographic Technologies VII, 942316 (19 March 2015); doi: 10.1117/12.2085697; https://doi.org/10.1117/12.2085697

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