Comparison of flow models for photoresist behavior at contact holes in thermal flow processes

Hideo Eto, Maki Miyazaki, Takehiro Kondoh, Eishi Shiobara, Shinichi Ito, Tetsuya Homma

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

The behavior of the photoresist between contact holes during the thermal flow process was investigated. When the photoresist width was smaller than 200 nm, the amount of shrinkage of the contact hole increased almost linearly with the photoresist width between contact holes. However, the amount of shrinkage was saturated and rarely changed with the photoresist width when the resist width was larger than 400 nm. We examined three models to investigate this phenomenon. The first one is the simple one-dimensional model, and the second one is the viscoelastic model with constant fluid viscosity. The third one is the viscoelastic model for the Bingham fluid. We calculated the amount of shrinkage of the contact hole vs the photoresist width, and the values calculated using the viscoelastic model for the Bingham fluid was consistent with the measured values. We also synthesized a contact-hole image by expanding this one-dimensional model to two dimensions. The average total hole radius error between the measured and the synthesized image was less than 7 nm, and the calculated image was almost the same as the measured one. We concluded that the viscoelastic model for the Bingham fluid is adequate for describing the photoresist behavior in the thermal flow process.

Original languageEnglish
JournalJournal of the Electrochemical Society
Volume154
Issue number10
DOIs
Publication statusPublished - 2007

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Photoresists
photoresists
electric contacts
shrinkage
Fluids
fluids
Hot Temperature
Viscosity
viscosity
radii

ASJC Scopus subject areas

  • Electrochemistry
  • Surfaces, Coatings and Films
  • Surfaces and Interfaces

Cite this

Comparison of flow models for photoresist behavior at contact holes in thermal flow processes. / Eto, Hideo; Miyazaki, Maki; Kondoh, Takehiro; Shiobara, Eishi; Ito, Shinichi; Homma, Tetsuya.

In: Journal of the Electrochemical Society, Vol. 154, No. 10, 2007.

Research output: Contribution to journalArticle

Eto, Hideo ; Miyazaki, Maki ; Kondoh, Takehiro ; Shiobara, Eishi ; Ito, Shinichi ; Homma, Tetsuya. / Comparison of flow models for photoresist behavior at contact holes in thermal flow processes. In: Journal of the Electrochemical Society. 2007 ; Vol. 154, No. 10.
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