Study of Si1-xGex Junction Formation for SOI Based CMOS Technology

SiGe source/drain technology has been sucessfully applied to bulk metal oxide semiconductor field effect transistors (MOSFETs). Both channel mobility and source/drain contact resistivity are substantially improved with this technology. In this dissertation, SiGe junction formation for silicon on insulator (SOI) based CMOS technology was investigated. Strain in epitaxially grown films on SOI films and silicon nanowires is studied using Raman spectroscopy and transmission electron microscope (TEM). For epitaxially grown SiGe film on SOI, there is lower degree of strain development in the SOI layer due to the rigid interface between the SOI and the burried oxide as compared to bulk. However, for silicon nanowires on oxide, the situation is different since nanowires serve as compliant substrates. Part of the strain energy is transferred to silicon nanowires. The consistency between synthesized Raman peak shifts and the experimental measurements verified the strain sharing between the epitaxially grown SiGe films and the silicon nanowires. Splittings of high order Laue zone line (HOLZ) from a convergent beam electron diffraction (CBED) pattern was quantified to study the strain distribution in epitaxial SiGe films grown on silicon nanowires. It was found out in this study that elastic deformation of epitaxial SiGe at free surfaces leads to strain relaxation at these surfaces. This phenomenon is detrimental to strain engineering in a nanowire MOSFET and provides new challenges to develop smart designs for constraining strain in the nano-structures. Moreover, atomic layer deposition (ALD) Platinum is proposed for metal deposition on 3D epitaxial SiGe source/drain. The uniform deposition around 3D SiGe films effectively increases the contact surface area which is highly desired in the FinFET application.

Author dc:creator

• Du, Yan

Advisors dc:contributor.advisor

• Dr. Mehmet C Ozturk, Committee Co-Chair
• Dr. Veena Misra, Committee Chair
• Dr. Carlton Osburn, Committee Member
• Dr. Gerd Duscher, Committee Member

• nanowire
• SiGe
• Pt ALD
• strain
• CBED

Statement dc:rights

• I hereby certify that, if appropriate, I have obtained and attached hereto a written permission statement from the owner(s) of each third party copyrighted matter to be included in my thesis, dis sertation, or project report, allowing distribution as specified below. I certify that the version I submitted is the same as that approved by my advisory committee. I hereby grant to NC State University or its agents the non-exclusive license to archive and make accessible, under the conditions specified below, my thesis, dissertation, or project report in whole or in part in all forms of media, now or hereafter known. I retain all other ownership rights to the copyright of the thesis, dissertation or project report. I also retain the right to use in future works (such as articles or books) all or part of this thesis, dissertation, or project report.

Dc Identifier Other

etd-01032008-153737

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https://repository.lib.ncsu.edu/server/oai/request?verb=GetRecord&metadataPrefix=dim&identifier=oai%3Arepository.lib.ncsu.edu%3A1840.16%2F3433