How methanol affects the surface of blue and red emitting porous silicon

J. M. Rehm, G. L. McLendon, L. Tsybeskov, P. M. Fauchet

Research output: Contribution to journalArticlepeer-review

4 Scopus citations

Abstract

The effects of liquid methanol on the photoluminescence intensity and FTIR spectra of red and blue emitting porous silicon were investigated. Hydrogen passivated red emitting samples exhibit quenching and recovery of photoluminescence intensity and broadening of the Si-Hx stretch bands upon exposure to liquid methanol. Oxygen passivated red emitting samples exhibit no photoluminescence quenching. The sensitivity of the red emitting sample is due to the microstructure of porous silicon at the surface and the ability of methanol to penetrate the pores. The blue photoluminescence of thermally oxidized samples is quenched upon exposure to methanol. This is attributed to the solvent's ability to change the surface passivation which modifies existing traps and introduces competitive recombination channels for electrons.

Original languageEnglish (US)
Number of pages1
JournalApplied Physics Letters
Volume66
StatePublished - Dec 1 1995
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy (miscellaneous)

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