Investigation of chemical adsorbate effects on blue and red emitting porous silicon samples

Julie M. Rehm, George L. McLendon, Leonid Tsybeskov, Philippe M. Fauchet

Research output: Contribution to journalConference articlepeer-review

1 Scopus citations

Abstract

We have investigated the sensitivity of blue (PLmax = 480 nm) and red (PLmax = 660 nm) emitting porous silicon samples to various chemical adsorbates. Steady-state and time-resolved photoluminescence measurements and FTIR spectroscopy were employed to characterize the photophysical and optical effects induced by chemical exposure. The red samples, which are hydrogen terminated, exhibit quenching and recovery of photoluminescence intensity and broadening of the Si-HX stretch bands upon exposure to liquid methanol. This behavior is attributed to the ability of the Si-HX specie on the surface of the PSI to interact with the solvent molecules which temporarily traps the electrons and causes PL loss and Si-Hx broadening. The blue samples, which are oxygen terminated, display similar sensitivity to methanol. This sensitivity is attributed to the solvent's ability to change the surface passivation and thereby introduce competitive radiative and nonradiative recombination channels. The origin of the blue PL is discussed.

Original languageEnglish (US)
Pages (from-to)393-398
Number of pages6
JournalMaterials Research Society Symposium - Proceedings
Volume358
StatePublished - Jan 1 1995
Externally publishedYes
EventProceedings of the 1994 MRS Fall Meeting - Boston, MA, USA
Duration: Nov 28 1994Nov 30 1994

All Science Journal Classification (ASJC) codes

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

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