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Process Optimization of UV Curing for Ultra Low-k Dielectrics and High-Stress SiN Liners

Published online by Cambridge University Press:  01 February 2011

Masazumi Matsuura ,
Kinya Goto ,
Shinobu Hashii ,
Noriko Miura ,
Yoshihiro Miyagawa ,
Tatsunori Murata ,
Yoshikazu Tsunemine  and
Koyu Asai
Masazumi Matsuura
Affiliation:
matsuura.masazumi@renesas.com, Renesas Technology Corp., Process Development Dept., 4-1,Mizuhara, Itami, 664-005, Japan
Kinya Goto
Affiliation:
goto.kinya@renesas.com, Renesas Technology Corp., Process Development Dept., 4-1,Mizuhara, Itami, 664-0005, Japan
Shinobu Hashii
Affiliation:
hashii.shinobu@renesas.com, Renesas Semiconductor Engineering Corp., 4-1,Mizuhara, Itami, 664-0005, Japan
Noriko Miura
Affiliation:
miura.noriko@renesas.com, Renesas Technology Corp., Process Development Dept., 4-1,Mizuhara, Itami, 664-0005, Japan
Yoshihiro Miyagawa
Affiliation:
miyagawa.yoshihiro@renesas.com, Renesas Technology Corp., Process Development Dept., 4-1,Mizuhara, Itami, 664-0005, Japan
Tatsunori Murata
Affiliation:
murata.tatsunori@renesas.com, Renesas Technology Corp., Process Development Dept., 4-1,Mizuhara, Itami, 664-0005, Japan
Yoshikazu Tsunemine
Affiliation:
tsunemine.yoshikazu@renesas.com, Renesas Technology Corp., Process Development Dept., 4-1,Mizuhara, Itami, 664-0005, Japan
Koyu Asai
Affiliation:
asai.koyu@renesas.com, Renesas Technology Corp., Process Development Dept., 4-1,Mizuhara, Itami, 664-0005, Japan
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Abstract

This paper describes process optimization of UV curing for ultra Low-k SiOC (ULK-SiOC, k=2.65) and High stress silicon nitride (HS-SiN) liner. We have investigated the impact of UV curing using different UV bulbs (UV-X and UV-Y) on BEOL process damages to the ULK-SiOC. The k-value variations of ULK-SiOC modified with UV-X with higher photon energy than UV-Y are greater than those of the pristine ULK-SiOC and the ULK-SiOC modified with UV-Y. These results are consistent with the previously reported FT-IR and NMR analyses that the UV-X generates 3-fold Si-O ring defects and Si-H bonds in the ULK-SiOC. In order to discuss the pore structure in UV-modified ULK-SiOC, the solvent diffusion of toluene and ethanol in ULK-SiOC were measured. The solvent diffusion of the UV-modified ULK-SiOC with UV-X is faster than that of the UV-modified ULK-SiOC with UV-Y. This result indicates that the pore size of UV-modified ULK-SiOC with UV-X is larger than that of UV- modified ULK-SiOC with UV-Y. The dependence of the stress increase in HS-SiN liner on different UV bulbs (UV-X and UV-Y) has been investigated by using stress measurement and FT-IR. The UV-modified HS-SiN liner with UV-Y achieves higher tensile stress, compared to the UV-X. FT-IR results have revealed that UV-Y is more effective for the dehydrogenation and SiN crosslinking, resulting in the greater increase in the tensile stress. In conclusion, UV-Y bulb with medium photon energy yields the desired UV modifications for ULK-SiOC and HS-SiN applications.

Keywords

dielectric propertiesplasma-enhanced CVD (PECVD) (deposition)insulator
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 990: Symposium B – Materials, Processes, Integration and Reliability in Advanced Interconnects for Micro- and Nanoelectronics , 2007 , 0990-B03-22
Copyright
Copyright © Materials Research Society 2007

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References

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