Interaction between rare-earth ions and amorphous silicon nanoclusters produced at low processing temperatures |
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Authors: | A Meldrum A Hryciw C Blois R DeCorby Quan Li |
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Institution: | a Department of Physics, University of Alberta, Edmonton, Canada T6G2J1 b Department of Electrical and Computer Engineering, University of Alberta, Edmonton, Canada T6G2V4 c Department of Physics, The Chinese University of Hong Kong, Shatin, NT, Hong Kong |
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Abstract: | Temperatures of 1000 °C and higher are a significant problem for the incorporation of erbium-doped silicon nanocrystal devices into standard silicon technology, and make the fabrication of contacts and reflectors in light emitting devices difficult. In the present work, we use energy-filtered TEM imaging techniques to show the formation of size-controlled amorphous silicon nanoclusters in SiO films annealed between 400 and 500 °C. The PL properties of such films are characteristic of amorphous silicon, and the spectrum can be controlled via a statistical size effect—as opposed to quantum confinement—that has previously been proposed for porous amorphous silicon. Finally, we show that amorphous nanoclusters sensitize the luminescence from the rare-earth ions Er, Nd, Yb, and Tm with excitation cross-sections similar in magnitude to erbium-doped silicon nanocrystal composites, and with a similar nonresonant energy transfer mechanism. |
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Keywords: | Nanocrystals Nanoclusters Silicon Luminescence |
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