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The Chemical Environment Of Er3+ In A-Si:Er:H And A-Si:Er:O:H

Published online by Cambridge University Press:  10 February 2011

Leandro R. Tessler ,
Cínthia Piamonteze ,
Ana Carola Iñguez ,
M. C. Martins Alves  and
H. Tolentino
Leandro R. Tessler
Affiliation:
Instituto de Física “Gleb Wtaghin’, UNICAMP, C.P. 6165, 13083–970 Campinas, SP, Brazil, tessler@ifi.unicamp.br
Cínthia Piamonteze
Affiliation:
Instituto de Física “Gleb Wtaghin’, UNICAMP, C.P. 6165, 13083–970 Campinas, SP, Brazil
Ana Carola Iñguez
Affiliation:
Instituto de Física “Gleb Wtaghin’, UNICAMP, C.P. 6165, 13083–970 Campinas, SP, Brazil
M. C. Martins Alves
Affiliation:
Laboratório Nacional de Luz Síncrotron, C. P. 6192, 13083–970, Campinas, SP, Brazil
H. Tolentino
Affiliation:
Laboratório Nacional de Luz Síncrotron, C. P. 6192, 13083–970, Campinas, SP, Brazil
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Abstract

We have measured extended x-ray absorption fine structure (EXAFS) of the Er LIII edge in a-Si:Er:O:H with different concentrations of Er and O. The samples were prepared by reactive RF co-sputtering from a silicon target partially covered with metallic erbium platelets. They present the characteristic Er 3+ photoluminescence at 1.54 μm as deposited. The FFT of the Er EXAFS provides two well separated peaks. The characteristics of the first peak resemble those of Er2O3. We associate the first neighbor shell with oxygen atoms, even in non intentionally oxygenated samples. The average coordination and Er-O separation are significantly smaller than in Er2O3. This may be the reason why Er3+ luminescence in a-Si:H presents small temperature quenching. The second shell is interpreted as being composed of silicon atoms.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 524: Symposium V – Application of Synchrotron Radiation Techniques…IV , 1998 , 327
Copyright
Copyright © Materials Research Society 1998

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