Morphology, structural and optical properties of silicon nanostructures obtained in a solution containing hexafluorosilicic acid H$_{2}$(SiF$_{6}$)

Boron doped porous silicon with the observed photoluminescence with a crystallographic orientation of (100), which was fabricated based on a $p$-type silicon substrate using electrochemical etching in a solution containing hexafluorosilicic acid and ethyl alcohol was studied. A comparative analysis of the morphology, structural and optical properties of silicon nanostructures obtained in a solution containing H$_{2}$(SiF$_{6}$) and ethanol and samples obtained in a solution containing HF and ethanol was performed. Morphology, structural and optical properties were studied using scanning probe microscopy and spectrophotometry. It was shown that samples of porous silicon obtained in a solution containing H$_{2}$(SiF$_{6}$) and ethanol are characterized by improved optical properties, in particular, they exhibit more intense photoluminescence compared to samples obtained in solutions with HF and ethyl alcohol.