Jpn. J. Appl. Phys. 44 (2005) pp. 8222-8226  |Previous Article| |Next Article|  |Table of Contents|
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Synthesis of Cubic and Hexagonal CdTe Nanoparticles Dispersed in SiO₂ Films: Role of Oxygen during Sintering

Padullaparthi Babu Dayal, Bodh Raj Mehta and Sonnada M. Shivaprasad¹

(Received February 16, 2005; accepted June 19, 2005; published November 9, 2005)

Cadmium telluride nanoparticles dispersed in SiO₂ films have been grown by the co-sputtering of elemental Cd, Te and SiO₂ targets in argon atmosphere. The role of oxygen during annealing on the structural and optical properties of CdTe nanoparticles dispersed in SiO₂ films has been studied. Formation of a CdTeO₃ layer around the CdTe nanoparticle core due to ambient oxygen present in air results in structural defects and thus the formation of hexagonal CdTe nanoparticles in air-annealed samples. In vacuum-annealed samples, defect free and well-crystallized cubic CdTe nanoparticles are formed which show excitonic features in the absorption spectra. These results have been confirmed by carrying out i) annealing in vacuum and air ambiences in a sequence on the same sample and ii) by depositing an additional layer of SiO₂ on the CdTe:SiO₂ samples to prevent the diffusion of ambient oxygen.

URL: http://jjap.jsap.jp/link?JJAP/44/8222/
DOI: 10.1143/JJAP.44.8222

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