Optical properties of the niobium centre in 4H, 6H, and 15R SiC

• A set of lines in the photoluminescence spectra of 4H-, 6H-, and 15R-SiC in the near-infrared are attributed to Nb-related defects on the ground of doping experiments conducted with 4H-SiC. A model based on a an exciton bound at the Nb-centre in an asymmetric split vacancy configuration at a hexagonal site is proposed, which explains the structure of the luminescence spectrum and the observed Zeeman splitting of the lines.

Nyckelord

transition metals; niobium; photoluminescence; Zeeman effect

TECHNOLOGY

TEKNIKVETENSKAP

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