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Influences of reaction products on etch rates and linewidths in a poly-Si/oxide etching process using HBr/O2 based inductively coupled plasma

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2 Author(s)
Miwa, K. ; VLSI Process Technology Laboratory, Fujitsu VLSI Ltd., 1500 Mizono, Tado-cho, Kuwana, Mie 511-0192, Japan ; Mukai, T.

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Variation of etch rates and linewidths due to various seasoning methods after plasma cleaning of an etch chamber in a poly-Si/oxide (SiO2) etching process are studied. An HBr/O2 based inductively coupled plasma (ICP) was investigated to determine the root cause and mechanisms of the variation. Poly-Si main-etch rates remain nearly constant after seasonings with bare-Si etching (hereafter, we denote the seasoning as Si seasoning) succeeding plasma cleaning of the chamber wall with an SF6 based ICP. Poly-Si over-etch rates increased and leveled off as the Si-seasoning time increased, whereas SiO2 etch rates drastically varied with increased Si-seasoning time. The optically estimated density of SiBr in the SiO2 etching plasma was found to increase with increased Si-seasoning time. SiO2 etch rates also varied as a function of O2 flow rate and bias power to the bottom electrode of the ICP etcher. These results suggest that etch rates of poly-Si and SiO2 are influenced by reaction products such as SiBrx (x=1,2,3) in the plasma. Critical-dimension (CD) shifts of poly-Si linewidths increased after Si seasonings. On the other hand, when short-time (about 10 s) plasma cleaning of the chamber was performed between etchings in the Si seasoning, CD shifts hardly increased or slightly decreased. Poly-Si over-etch rates also hardly increased with the short-time plasma cleaning. The results suggest that reaction products derived from deposition on the chamber wall would lead to the increase of CD shifts of poly-Si linewidths and poly-Si over-etch rates. © 2002- - American Vacuum Society.

Published in:

Journal of Vacuum Science & Technology B: Microelectronics and Nanometer Structures  (Volume:20 ,  Issue: 5 )

Date of Publication:

Sep 2002

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