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Measurement and control of a residual oxide layer on TiSi2 films employed in ohmic contact structures

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dc.contributor.authorCollins, George J., author
dc.contributor.authorAnderson, M. E., author
dc.contributor.authorShaw, Denis M., author
dc.contributor.authorLu, Z., author
dc.contributor.authorHathcock, S., author
dc.contributor.authorNikkel, P., author
dc.contributor.authorYu, Zengqi, author
dc.contributor.authorIEEE, publisher
dc.date.accessioned2007-01-03T07:27:54Z
dc.date.available2007-01-03T07:27:54Z
dc.date.issued1996
dc.description.abstractAn inadvertent oxide layer is formed on a titanium disilicide (TiSi2) film following various wet and dry processes in a manufacturing environment. The use of H2SO4:H2O2:H2O (1:1:5) as a wet etch for excess Ti metal, prior to the high temperature anneal used to form a subsequent TiSi2 layer, is identified as the source of the undesired oxide via multiwavelength spectroscopic ellipsometry and Auger electron spectrometry studies. This inadvertent oxide layer on TiSi2 is shown to form bad electrical contacts and is a contributing source to large standby currents in polysilicon gate shunts. Spectroscopic ellipsometry is shown herein as a unique analytical tool to determine both the thickness and structure of this poorly structured oxide during process development. A single wavelength ellipsometer monitoring scheme for both the appearance as well as the thickness of this inadvertent oxide layer is proposed for use in high-volume manufacturing.
dc.description.sponsorshipThis work was supported by the National Science Foundation under Grants DDM-9108531, DDM-9502651, and DMI-9424399, and by the Hewlett Packard Company.
dc.format.mediumborn digital
dc.format.mediumarticles
dc.identifier.bibliographicCitationYu, Z., et al., Measurement and Control of a Residual Oxide Layer on TiSi2 Films Employed in Ohmic Contact Structures, IEEE Transactions on Semiconductor Manufacturing 9, no. 3 (August 1996): 329-334.
dc.identifier.urihttp://hdl.handle.net/10217/632
dc.languageEnglish
dc.language.isoeng
dc.publisherColorado State University. Libraries
dc.relation.ispartofFaculty Publications
dc.rights©1996 IEEE.
dc.rightsCopyright and other restrictions may apply. User is responsible for compliance with all applicable laws. For information about copyright law, please see https://libguides.colostate.edu/copyright.
dc.subjectauger effect
dc.subjectannealing
dc.subjectellipsometry
dc.subjectetching
dc.subjectmetallic thin films
dc.subjectohmic contacts
dc.subjectoxidation
dc.subjecttitanium compounds
dc.titleMeasurement and control of a residual oxide layer on TiSi2 films employed in ohmic contact structures
dc.typeText

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