Abstract
The interaction of porous silicon (PS) with aqueous solutions of Fe(NO3)3 with different molar (M) concentrations causes introduction of iron ions into silicon pores (PS–Fe), formation of adsorbed iron coatings with different thicknesses, and an increase in the stability of PS layers, which is important for development of device structures based of PS. To treat PS layers with solutions by the immersion method, it is necessary to determine how this affects the spectral composition and intensity of photoluminescence (PL), as well as the kinetics of PL changes during long storage under atmospheric conditions. Upon treatment of freshly prepared PS by immersion into in a Fe(NO3)3 aqueous solution, it was found that, after short-term storage (up to 5 days) of the PS samples, the PL intensity increases by 7.5 and 3–3.6 times at low (0.2 M) and high (0.7–0.8 M) concentrations of Fe(NO3)3, respectively, compared to the PL intensity of an untreated PS layer. After long-term storage (4 months), the PL intensity of PS–Fe samples with concentrations of 0.1–0.2 and 0.7–0.8 M was observed to considerably increase (by 8–18 times) with unchanged position of the PL peak with respect to untreated PS. However, at the Fe(NO3)3 concentration of 0.3 М, the PL intensity decreases and the PL peak shifts to the blue, which is explained by incomplete coverage of the PS surface by an adsorbed iron layer. The kinetics of PL spectra during long-term storage is analyzed, and a model is proposed to explain the PL intensity and spectral composition.
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Original Russian Text © N.G. Galkin, D.T. Yan, K.N. Galkin, M.V. Bozhenko, 2018, published in Optika i Spektroskopiya, 2018, Vol. 125, No. 2, pp. 191–196.
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Galkin, N.G., Yan, D.T., Galkin, K.N. et al. The Influence of Immersion of Porous Silicon in Aqueous Solutions of Fe(NO3)3 on Photoluminescence during Long Storage. Opt. Spectrosc. 125, 199–204 (2018). https://doi.org/10.1134/S0030400X18080064
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DOI: https://doi.org/10.1134/S0030400X18080064