The nature of the dominant deep trap in amorphous silicon nitride films: Evidence for a negative correlation energy

P. M. Lenahan, D. T. Krick, J. Kanicki

Research output: Contribution to journalArticle

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Abstract

A recent study by Krick and coworkers provided the first direct evidence associating a specific point-defect with trapping phenomena in silicon nitride films. Krick and coworkers demonstrated that silicon "dangling bond" centers in silicon nitride films are electrically neutral when paramagnetic and are rendered diamagnetic when they trap an electron or a hole. We show that these centers exhibit behavior consistent with a negative electron-electron correlation energy, a so-called negative U. With a negative U there is a strong attractive interaction between spin-up and spin-down electrons on the same dangling bond site. This attractive interaction implies that, in thermodynamic equilibrium, nearly all of the defect sites will be diamagnetic - either positively or negatively charged.

Original languageEnglish (US)
Pages (from-to)392-405
Number of pages14
JournalApplied Surface Science
Volume39
Issue number1-4
DOIs
StatePublished - Oct 1989

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All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Condensed Matter Physics
  • Physics and Astronomy(all)
  • Surfaces and Interfaces
  • Surfaces, Coatings and Films

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