期刊
出版社
ELECTROCHEMICAL SOC INC
DOI: 10.1149/07705.0059ecst
关键词
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资金
- DOE [DE-AC02-76CH-00016]
- National Science Foundation
- National Institutes of Health/National Institute of General Medical Sciences under NSF award [DMR-1332208]
- Canada Foundation for Innovation
- Natural Sciences and Engineering Research Council of Canada
- University of Saskatchewan
- Government of Saskatchewan
- Western Economic Diversification Canada
- National Research Council Canada
- Canadian Institutes of Health Research
Silicide materials used as contacts in CMOS devices have evolved over many technology nodes. This article traces the often forgotten defectivity related reasons that were the primary drivers for a change in materials or process flow - evolving from Ti to Co and Ni silicides, and the more recent return to Ti-based liner silicides. The criteria used for the selection of these metal silicides have undergone a dramatic change with the advent of 3-D transistors and trench silicide contacts, and is now primarily guided by the value of interfacial contact resistivity (rho(c)). Furthermore, using results from synchrotron X-ray diffraction and pole-figure analysis, we present how phase formation and microstructure of contacts vary with Ti thickness, alternative annealing treatments, and substrate composition and orientation. We show that microstructure in very thin films can change from amorphous to epitaxial, a factor likely to become important for the contacts in upcoming generations of devices.
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