Silicon surface passivation by organic monolayers: Minority charge carrier lifetime measurements and Kelvin probe investigations

A.B. Sieval, C.L. Huisman, A. Schonecker, F.M. Schuurmans, A.S.H. van der Heide, A. Goossens, W.C. Sinke, H. Zuilhof, E.J.R. Sudhölter

Research output: Contribution to journalArticleAcademicpeer-review

64 Citations (Scopus)

Abstract

The silicon surface passivation of monolayers of organic compounds that are bound to Si surfaces by a covalent Si-C bond has been investigated. The effective lifetime eff of minority charge carriers in the surface-modified semiconductor has been determined by modulated free carrier absorption (MFCA) measurements. The results show that on 1-2 ·cm p-type Si(100) surfaces modified with a monolayer obtained from CH2=CH-(CH2)8-C(=O)-O-CH3 maximum effective lifetimes eff 130 s can be obtained. This value corresponds to a maximum surface recombination velocity Seff of 120 cm/s, a value that is similar to those obtained using other passivation techniques, which demonstrates that these monolayers provide an interesting alternative for silicon surface passivation. During these MFCA measurements an unusual time dependence of the effective lifetime is observed: eff rises continuously during illumination of the substrate. Kelvin probe measurements show that there is a slow shift of the Fermi level of the semiconductor under illumination, which seems to be the result of a slow, reversible filling of surface traps
Original languageEnglish
Pages (from-to)6846-6852
JournalThe Journal of Physical Chemistry Part B: Condensed Matter, Materials, Surfaces, Interfaces & Biophysical
Volume107
Issue number28
DOIs
Publication statusPublished - 2003

Keywords

  • hydrogen-terminated silicon
  • ultrathin sio2 overlayers
  • alkyl monolayers
  • recombination velocity
  • photoconductance decay
  • si(111) surfaces
  • germanium surfaces
  • si-sio2 interface
  • si(100) surface
  • air

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