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TitleMicrostructure and photoluminescence of CdS-doped silica films grown by RF magnetron sputtering
Author(s)Rolo, Anabela G.
Stepikhova, M.
Filonovich, Sergej
Ricolleau, S.
Vasilevskiy, Mikhail
Gomes, M. J. M.
Nanocrystals (NCs)
RF Magnetron Sputtering
Stokes shifted
Issue dateNov-2002
Journalphysica status solidi (b)
Abstract(s)Silica films containing CdS nanometer-sized particles with semiconductor contents of 1–10% were produced by radio-frequency magnetron sputtering at room temperature with subsequent annealing. The mean diameter of the CdS nanocrystals (NCs) varied between 4 and 6 nm, with narrow size distribution. High-resolution transmission electron microscopy images obtained for low-semiconductor-fraction samples showed quite a homogeneous NC distribution inside the silica matrix, while the high-concentration samples showed an agglomeration of NCs in a columnar structure. The observed photoluminescence (PL) bands were correlated with the semiconductor concentration. Two intense PL bands, one near the band-gap energy and the other in the red, were observed at low temperature for samples with low CdS fraction. The high-energy band was found to be Stokes shifted by some 200 meV with respect to the absorption edge at room temperature. The samples with high CdS fraction only displayed a broad red emission band, which was attributed to interface states.
DescriptionThe authors wish to thank Luís Rebouta for the RBS data as well as the electron microscopy staff for providing the use of the Philips CM 20 transmission electron microscope (Châtillon-Montrouge, Paris, France).
Publisher version
AccessRestricted access (UMinho)
Appears in Collections:CDF - CEP - Artigos/Papers (with refereeing)
CDF - FMNC - Artigos/Papers (with refereeing)

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