Anti-contamination SMART (Spectrum Monitoring Apparatus with Roll-to-roll Transparent film) window for optical diagnostics of plasma systems
Optical emission spectroscopy is widely used in semiconductor and display manufacturing for plasma process monitoring. However, because of the contamination of the viewport, quantitative analysis is extremely difficult; therefore, qualitative analysis is used to detect species in the process. To ext...
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Published in | Review of scientific instruments Vol. 92; no. 1; p. 013507 |
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Main Authors | , , , , |
Format | Journal Article |
Language | English |
Published |
United States
01.01.2021
|
Online Access | Get more information |
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Summary: | Optical emission spectroscopy is widely used in semiconductor and display manufacturing for plasma process monitoring. However, because of the contamination of the viewport, quantitative analysis is extremely difficult; therefore, qualitative analysis is used to detect species in the process. To extend plasma monitoring in advanced precise processes, the contamination problem of the viewport must be solved. We propose a new spectrum monitoring apparatus with a roll-to-roll transparent film window for optical diagnostics of a plasma system. By moving a transparent film in front of the viewport, contamination in the emission light path becomes negligible. However, the speed of the film should be optimized to reduce the maintenance period and to minimize measurement errors. We calculated the maximum thickness of SiO
, Si
N
, ITO, and the Ar/CHF
plasma contaminant to suppress the electron temperature error measured by the line-intensity-ratio within 2% at 2 eV. The thickness of the Si
N
, ITO, and Ar/CHF
plasma contaminant should be thinner than 12.5 nm, 7.5 nm, and 100 nm, respectively. |
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ISSN: | 1089-7623 |
DOI: | 10.1063/5.0031869 |