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Reversible Luminescence Quenching of Porous Si by Solvents

Published online by Cambridge University Press:  15 February 2011

Jeffrey M. Lauerhaas ,
Grace M. Credo ,
Julie L. Heinrich  and
Michael J. Sailor
Jeffrey M. Lauerhaas
Affiliation:
Department of Chemistry, The University of California at San Diego, La Jolla, CA 92093-0506
Grace M. Credo
Affiliation:
Department of Chemistry, The University of California at San Diego, La Jolla, CA 92093-0506
Julie L. Heinrich
Affiliation:
Department of Chemistry, The University of California at San Diego, La Jolla, CA 92093-0506
Michael J. Sailor
Affiliation:
Department of Chemistry, The University of California at San Diego, La Jolla, CA 92093-0506
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Abstract

Interaction of the solvents tetrahydrofuran, diethyl ether, methylene chloride, toluene, o-xylene, benzene, and methanol with luminescent porous n- Si (PS) results in reversible quenching of the luminescence associated with this material. The degree of quenching ranges from 99% – 50%, and scales with solvent dipole moment. Reaction with gaseous Cl2, Br2, or I2 results in irreversible quenching, associated with a surface reaction that removes Si-H bonds. Total luminescence quenching is observed on treatment of a PS wafer with a solution of the electron donor ferrocene in toluene, suggesting that charge transfer quenching may also be operative in this material. Luminescence is partially recovered by rinsing the PS in pure toluene. The data show that photoluminescence of PS is highly sensitive to surface adsorbates, suggesting that carrier trapping is easily induced in this material.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 256: Symposia AA – Light Emission from Silicon , 1991 , 137
Copyright
Copyright © Materials Research Society 1992

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References

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