Light emitting mechanisms dependent on stoichiometry of Si-rich-SiNx films grown by PECVD View Full Text


Ontology type: schema:ScholarlyArticle     


Article Info

DATE

2016-10-22

AUTHORS

T. V. Torchynska, J. L. Casas Espinola, J. A. Jaramillo Gomez, J. A. Bentosa Gutiérrez, L. Khomenkova, A. Slaoui

ABSTRACT

Light emission and morphology of silicon-rich silicon nitride films grown by plasma-enhanced chemical vapor deposition were investigated versus film’s stoichiometry. The excess silicon content in the films was controlled varying the NH3/SiH4 gas flow ratio from 0.45 up to 1.0. High-temperature annealing was employed to form the silicon quantum dots (QDs) and to enhance the photoluminescence (PL) in visible spectral range. The PL spectrum was found to be complex. The competition of five PL bands leads to the non-monotonous variation of total PL peak position in the range of 1.55–2.95 eV when the Si excess content increases. The shape of PL spectra depends also on an excitation light wavelength. It is shown that for the films fabricated with R ≤ 0.56 and R ≥ 0.67 the dominant contribution into PL spectra is given by native SiNx defects, whereas in the films obtained with R = 0.59–0.67 the Si-QDs form the main radiative channel. The highest PL intensity is detected in Si-rich SiNx films grown at R = 0.59–0.67 as well. PL mechanisms are discussed in terms of the contribution of different radiative channels in the light emission process that can show the ways for the optimization of SiNx light-emitting properties. More... »

PAGES

6977-6981

References to SciGraph publications

Identifiers

URI

http://scigraph.springernature.com/pub.10.1007/s10854-016-5864-8

DOI

http://dx.doi.org/10.1007/s10854-016-5864-8

DIMENSIONS

https://app.dimensions.ai/details/publication/pub.1021070806


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