Journal
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
Volume 111, Issue 2, Pages 501-507Publisher
SPRINGER HEIDELBERG
DOI: 10.1007/s00339-013-7556-z
Keywords
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Funding
- Natural Science Foundation of Hebei Educational Committee [2010112]
- Major Program for the Fundamental Research of Hebei, China [12963930D]
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An efficient synthesis route for highly luminescent silicon nanocrystal (Si-nc) films is presented. Si-ncs in the films are synthesized in the gas phase by using an argon-silane radio-frequency dielectric-barrier discharge (RF-DBD) plasma. The size of Si-ncs is well tunable by changing the resident time. The resulting Si-nc films with different oxidation degree exhibit emission across the full visible spectrum. Structural and optical characterization indicates that the red-to-green luminescence from big particles show quantum confinement effect (QCE), while this effect disappears in blue luminescence from small ones. A model is presented to explain this result. In this model, the radiative process in big particles is Band-to-Band recombination, in which surface states have a negligible impact on the QCE, while the blue emission from small Si-ncs is due to the Band-to-Bound recombination, in which surface state plays an important role, resulting in the disappearance of QCE. Additionally, obvious double-exponential decay from midsize particles is observed, in which the two kinds of recombination may coexist.
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