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The Relationship Between Surface Chemistry and Photoluminescence of Porous Silicon

Published online by Cambridge University Press:  25 February 2011

Kun-Hsi Li ,
Chaochieh Tsai ,
Joe C. Campbell ,
Milan Kovar  and
John M White
Kun-Hsi Li
Affiliation:
Microelectronics Research Center, Department of Electrical and Computer Engineering
Chaochieh Tsai
Affiliation:
Microelectronics Research Center, Department of Electrical and Computer Engineering
Joe C. Campbell
Affiliation:
Microelectronics Research Center, Department of Electrical and Computer Engineering
Milan Kovar
Affiliation:
Department of Chemistry and BiochemistryThe University of Texas at Austin, Austin, TX 78712
John M White
Affiliation:
Department of Chemistry and BiochemistryThe University of Texas at Austin, Austin, TX 78712
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Abstract

Green photoluminescence (PL) is observed from an as-anodized porous Si wafer immersed in the anodization electrolyte and the PL turns red after the sample is removed from the electrolyte and is blown dry. The PL of porous Si immersed in alcohol exhibits a blue shift and a marked decrease in intensity relatively to dry, as-anodized wafers. However, when the immersed samples are treated with UV for a few minutes, the PL peak shifts to a longer wavelength. Fourier-transform infrared spectroscopy reveals that alkoxy surface species and silicon hydride species backbonded to oxygen atoms appear on the UV-treated samples. Furthermore, the PL characteristics and surface species of the UV-treated samples can be recovered to those of as-anodized wafers by dipping in HF. These results point out the importance of surface chemistry in the luminescence process of porous Si.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 298: Symposium B – Silicon-Based Optoelectronic Materials , 1993 , 173
Copyright
Copyright © Materials Research Society 1993

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