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- Title
High-Temperature Characterization of Silicon Dioxide Films with Wafer Curvature.
- Authors
Bigl, S.; Heinz, W.; Kahn, M.; Schoenherr, H.; Cordill, M.
- Abstract
Amorphous silicon dioxide films used as dielectric layers in microelectronic devices are deposited using plasma-enhanced chemical vapor deposition. Because of the presence of hydrogen and nitrogen species in the precursor gases, incorporation of such species in the films can lead to crack formation during subsequent annealing processes up to 1000°C. In this study, the role of film chemistry on the thermo-mechanical behavior of silicon dioxide films is studied with in situ film stress measurements using wafer curvature to maximum temperatures of 1000°C. This is a significant advance because normal wafer curvature can only reach maximum temperatures of around 500°C. The increased temperature range allows for the stress evolution and film chemistry to be examined for the relevant processing conditions. It was found that at temperatures higher than 550°C, hydrogen bond cleavage led to a large stress increase and film chemistry change due to new bonding arrangements between nitrogen and silicon as well as subsequent film densification causing cracking of films. These changes could only be identified with wafer curvature measurements up to 1000°C.
- Subjects
MICROELECTRONIC materials; SILICA testing; CHEMICAL vapor deposition; HYDROGEN; NITROGEN
- Publication
JOM: The Journal of The Minerals, Metals & Materials Society (TMS), 2015, Vol 67, Issue 12, p2902
- ISSN
1047-4838
- Publication type
Article
- DOI
10.1007/s11837-015-1600-8