By means of ab-initio calculations, we investigate the optical properties of pure a-SiNx samples, with , and samples embedding silicon nanoclusters (NCs) of diameter nm. In the pure samples, the optical absorption gap and the radiative recombination rate vary according to the concentration of Si-N bonds. In the presence of NCs, the radiative rate of the samples is barely affected, indicating that the intense photoluminescence of experimental samples is mostly due to the matrix itself rather than to the NCs. Besides, we evidence an important role of Si-N-Si bonds at the NC/matrix interface in the observed photoluminescence trend.
The influence of silicon nanoclusters on the optical properties of a-SiNx samples: A theoretical study
Roberto Guerra, Mariella Ippolito, Simone Meloni, Stefano Ossicini; The influence of silicon nanoclusters on the optical properties of a-SiNx samples: A theoretical study. Appl. Phys. Lett. 30 April 2012; 100 (18): 181905. https://doi.org/10.1063/1.4711017
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