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Dive into the research topics where Seiichiro Tachibana is active.

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Featured researches published by Seiichiro Tachibana.


Proceedings of SPIE | 2008

Graded spin-on organic bottom antireflective coating for high NA lithography

Dario L. Goldfarb; Sean D. Burns; Libor Vyklicky; Dirk Pfeiffer; Anthony D. Lisi; Karen Petrillo; John C. Arnold; Daniel P. Sanders; Aleksandra Clancy; Robert Lang; Robert D. Allen; David R. Medeiros; Dah Chung Owe-Yang; Kazumi Noda; Seiichiro Tachibana; Shozo Shirai

Immersion lithography for the 32nm node and beyond requires advanced methods to control 193 nm radiation reflected at the resist/BARC interface, due to the high incident angles that are verified under high numerical aperture (NA) imaging conditions. Swing curve effects are exacerbated in the high NA regime, especially when highly reflective substrates are used, and lead to critical dimension (CD) control problems. BARC reflectivity control is also particularly critical when underlying surface topography is present in buried layers due to potential reflective notching problems. In this work, a graded spin-on organic BARC was developed to enable appropriate reflectivity control under those conditions. The graded BARC consists of two optically distinct polymers that are completely miscible in the casting solution. Upon film coating and post-apply baking, the two polymers vertically phase-separate to form an optically graded layer. Different characterization techniques have been applied to the study of the distribution of graded BARC components to reveal the internal and surface composition of the optically graded film, which includes Variable Angle Spectroscopic Ellipsometry (VASE) and Secondary Ion Mass Spectroscopy (SIMS). Also, optical constant optimization, substrate compatibility, patterning defectivity and etch feasibility for graded BARC layers are described. Superior 193 nm lithographic performance and reflectivity control of graded BARC beyond 1.20 NA compared to conventional BARCs is also demonstrated.


Proceedings of SPIE | 2012

Focus improvement with NIR absorbing underlayer attenuating substructure reflectivity

Wu-Song Huang; Dario L. Goldfarb; Wai-kin Li; Martin Glodde; Kazumi Noda; Seiichiro Tachibana; Masaki Ohashi; Dah-Chung Owe-Yang; Takeshi Kinsho

Process dependent focus leveling errors occur in photolithography when there is unpredicted reflectivity originating from multilayer structures on the fully integrated process wafer. The typical wavelength used in optical focus sensors is in the near infrared (NIR) range which is highly transparent to most dielectric materials. Consequently, the reflected light from underlying structures perturbs the accuracy of the leveling signal reflected from resist surface. To alleviate this issue, air-gauge focus sensors have been used to measure the wafer surface topography for an in-situ calibration to correct the focus leveling error. Using an air-gauge sensor is a slow process and a throughput detractor. Therefore, an NIR-absorbing underlayer has been developed for easy insertion into existing resist coating processes. It has been demonstrated that the air-gauge sensor can be turned off without showing any degradation in leveling data or litho performance on back end of line (BEOL) integrated wafers.


Archive | 2009

Polymerizable anion-containing sulfonium salt and polymer, resist composition, and patterning process

Masaki Ohashi; Youichi Ohsawa; Takeshi Kinsho; Jun Hatakeyama; Seiichiro Tachibana


Archive | 2007

Sulfonium salt having polymerizable anion, polymer, resist composition, and patterning process

Youichi Ohsawa; Masaki Ohashi; Seiichiro Tachibana; Jun Hatakeyama; Takeru Watanabe


Archive | 2009

Sulfonium salt-containing polymer, resist composition, and patterning process

Youichi Ohsawa; Jun Hatakeyama; Seiichiro Tachibana; Takeshi Kinsho


Archive | 2007

Sulfonium salt having polymerizable anion and polymer compound, resist material and method for pattern formation

Jun Hatakeyama; Masaki Ohashi; Yoichi Osawa; Seiichiro Tachibana; Takeshi Watanabe; 正樹 大橋; 洋一 大澤; 誠一郎 橘; 武 渡辺; 畠山 潤


Archive | 2009

Sulfonium salt having polymerizable anion and high molecular compound, resist material, and method for forming pattern

Jun Hatakeyama; Go Kanao; Masaki Ohashi; Yoichi Osawa; Seiichiro Tachibana; 正樹 大橋; 洋一 大澤; 誠一郎 橘; 畠山 潤; 剛 金生


Archive | 2006

LACTONE-CONTAINING COMPOUND, POLYMERIC COMPOUND, RESIST MATERIAL, AND PATTERN FORMING METHOD

Koji Hasegawa; Takeshi Kanou; Tsunehiro Nishi; Seiichiro Tachibana; 誠一郎 橘; 恒寛 西; 剛 金生; 幸士 長谷川


Archive | 2002

Cyclic acetal compound, polymer, resist composition and patterning process

Mutsuo Nakashima; Seiichiro Tachibana; Takeru Watanabe; Takeshi Kinsho; Koji Hasegawa; Tsunehiro Nishi; Jun Hatakeyama


Archive | 2003

Novel ester compounds, polymers, resist compositions and patterning process

Koji Hasegawa; Tsunehiro Nishi; Takeshi Kinsho; Takeru Watanabe; Matsuo Nakashima; Seiichiro Tachibana; Jun Hatakeyama

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Tsutomu Ogihara

East Tennessee State University

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