Chemical state of phosphorous at the SiC/SiO 2 interface

E. Pitthan, V. P. Amarasinghe, C. Xu, A. L. Gobbi, G. H.S. Dartora, T. Gustafsson, Leonard C Feldman, F. C. Stedile

Research output: Contribution to journalArticle

Abstract

The chemical nature of sub-monolayer phosphorous impurities at the SiC/SiO 2 interface is a critical surface science problem related to device performance and other applications. In this study, SiO 2 films containing phosphorus were deposited by sputtering on both the Si and C-faces of SiC substrates, and on silicon (Si(100)) substrates. After oxide removal by etching, a significant amount of phosphorus was retained on both SiC surfaces, while no phosphorus was observed on the Si surface. Chemical ambient investigation, quantification by XPS, and water contact angle measurements indicate that the phosphorus on the SiC surface is trivalent bonded, mainly to oxygen. Based on these results, a SiO 2 /SiC interfacial structure is proposed: Si-C-Si-|-O-P-O 2 -SiO 2 . These results provide new insights into the role of phosphorus, its incorporation, and stability, as a passivating agent in the performance of SiC MOS structures.

Original languageEnglish
Pages (from-to)172-176
Number of pages5
JournalThin Solid Films
Volume675
DOIs
Publication statusPublished - Apr 1 2019

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Keywords

  • Metal-oxide-semiconductor structure
  • Phosphorus incorporation
  • Silicon carbide surface
  • Sputtering deposition

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Surfaces and Interfaces
  • Surfaces, Coatings and Films
  • Metals and Alloys
  • Materials Chemistry

Cite this

Pitthan, E., Amarasinghe, V. P., Xu, C., Gobbi, A. L., Dartora, G. H. S., Gustafsson, T., Feldman, L. C., & Stedile, F. C. (2019). Chemical state of phosphorous at the SiC/SiO 2 interface Thin Solid Films, 675, 172-176. https://doi.org/10.1016/j.tsf.2019.02.038