Computational chemistry study on initial stages of nitridation of silicon surfaces

Seiichi Takami, Hui Zhou, Hiroyuki Tamura, Momoji Kubo, Akira Miyamoto

Research output: Contribution to journalArticlepeer-review

Abstract

We performed computational studies on the change in enthalpy during incorporation of one nitrogen atom into bare silicon surfaces, and proposed six possible nitrided structures for the Si(100) surface and five for Si(111). The results indicated that the topmost silicon atoms on Si(111) surfaces were favorably nitrided as compared with the inner silicon atoms while both the topmost and the second layer of Si(100) were nitrided. To account for this tendency, the changes in enthalpy during nitridation were divided into the energy of deformation of the Si lattice (ΔEdef) and the energy of bond formation (ΔEbond) between N and Si atoms. The heat of bond formation during nitridation on Si(111) was almost independent of nitridation sites. Therefore, differences in the enthalpy of nitridation between the outer surface and inner atoms resulted from Δ Edef. No distinct relationship was observed between the two energies, ΔEdef and ΔEbond for Si(100).

Original languageEnglish
Pages (from-to)4443-4446
Number of pages4
JournalJapanese Journal of Applied Physics, Part 1: Regular Papers and Short Notes and Review Papers
Volume39
Issue number7 B
Publication statusPublished - 2000 Dec 1

Keywords

  • Computational chemistry
  • Deformation
  • Monolayer
  • Nitride
  • Silicon surface

ASJC Scopus subject areas

  • Engineering(all)
  • Physics and Astronomy(all)

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