Size-dependent oxygen-related electronic states in silicon nanocrystals

J. S. Biteen; N. S. Lewis; H. A. Atwater; A. Polman

doi:10.1063/1.1765200

Size-dependent oxygen-related electronic states in silicon nanocrystals

J. S. Biteen, N. S. Lewis, H. A. Atwater, A. Polman

California Institute of Technology

Research output: Contribution to journal › Article › peer-review

92 Citations (Scopus)

Abstract

The isolation of silicon nanocrystals embedded in SiO ₂ and isolated nanocrystals' excitonic emission energy were investigated during controlled oxidation. The nanocrystals with diameters of ∼2.9-3.4 nm exhibited photoluminescence (PL) blueshift upon oxidatively induced size reduction. The oxidation of smaller Si nanocrystals resulted in a PL blueshift, but a redshift in the PL was observed after growth of ∼0.3 monolayers of native oxide. The results show that decrease in excitonic emission energy during oxidation is consistent with formation of an oxygen-related excitonic recombination state.

Original language	English
Pages (from-to)	5389-5391
Number of pages	3
Journal	Applied Physics Letters
Volume	84
Issue number	26
DOIs	https://doi.org/10.1063/1.1765200
Publication status	Published - Jun 28 2004

ASJC Scopus subject areas

Physics and Astronomy (miscellaneous)

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AU - Biteen, J. S.

AU - Lewis, N. S.

AU - Atwater, H. A.

AU - Polman, A.

N1 - Funding Information: This work was supported by NSF. The Dutch contribution to this work is part of the research program of and is financially supported by .

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Y1 - 2004/6/28

N2 - The isolation of silicon nanocrystals embedded in SiO 2 and isolated nanocrystals' excitonic emission energy were investigated during controlled oxidation. The nanocrystals with diameters of ∼2.9-3.4 nm exhibited photoluminescence (PL) blueshift upon oxidatively induced size reduction. The oxidation of smaller Si nanocrystals resulted in a PL blueshift, but a redshift in the PL was observed after growth of ∼0.3 monolayers of native oxide. The results show that decrease in excitonic emission energy during oxidation is consistent with formation of an oxygen-related excitonic recombination state.

AB - The isolation of silicon nanocrystals embedded in SiO 2 and isolated nanocrystals' excitonic emission energy were investigated during controlled oxidation. The nanocrystals with diameters of ∼2.9-3.4 nm exhibited photoluminescence (PL) blueshift upon oxidatively induced size reduction. The oxidation of smaller Si nanocrystals resulted in a PL blueshift, but a redshift in the PL was observed after growth of ∼0.3 monolayers of native oxide. The results show that decrease in excitonic emission energy during oxidation is consistent with formation of an oxygen-related excitonic recombination state.

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Size-dependent oxygen-related electronic states in silicon nanocrystals

Abstract

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