Nano-scale chemistry of complex self-assembled nanostructures in epitaxial sige films

Prabhu Balasubramanian, Jerrold A. Floro, Jennifer L. Gray, Robert Hull

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Heteroepitaxy of SiGe alloys on Si (001) under certain growth conditions has previously been shown to cause self-assembly of nanostructures called Quantum Dot Molecules, QDMs, where pyramidal pits and 3D islands cooperatively form. QDMs have potential applications to nanologic device architectures such as Quantum Cellular Automata that relies on localization of charges inside islands to create bi-stable logic states. In order to determine the applicability of QDMs to such structures it is necessary to understand the nano-scale chemistry of QDMs because the chemistry affects local bandgap which in turn affects a QDM's charge confinement property. We investigate the nanoscale chemistry of QDMs in the Si0.7Ge0.3/Si (100) system using Auger Electron Spectroscopy (AES). Our AES analysis indicates that compressively strained QDM pit bases are the most Ge rich regions in a QDM. The segregation of Ge to these locations cannot be explained by strain energy minimization.

Original languageEnglish (US)
Title of host publicationNanostructured Semiconductors and Nanotechnology
PublisherMaterials Research Society
Pages75-80
Number of pages6
ISBN (Print)9781605115283
DOIs
StatePublished - Jan 1 2014
Event2013 MRS Spring Meeting - San Francisco, CA, United States
Duration: Apr 1 2013Apr 5 2013

Publication series

NameMaterials Research Society Symposium Proceedings
Volume1551
ISSN (Print)0272-9172

Other

Other2013 MRS Spring Meeting
CountryUnited States
CitySan Francisco, CA
Period4/1/134/5/13

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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  • Cite this

    Balasubramanian, P., Floro, J. A., Gray, J. L., & Hull, R. (2014). Nano-scale chemistry of complex self-assembled nanostructures in epitaxial sige films. In Nanostructured Semiconductors and Nanotechnology (pp. 75-80). (Materials Research Society Symposium Proceedings; Vol. 1551). Materials Research Society. https://doi.org/10.1557/opl.2013.1019