مقارنة بين ثلاث محاليل لإنتاج السيليكون المسامي

Rp_ Comparison among three solutions for production of porous silicon. pdf

Abstract
Porous silicon has been studied by its physical, chemical and structural properties
The results of the used acids were studied ( HF + HNO3 , HNO3 + Salt (NaCl) and HF + Ethanol ) and compared by studying the morphological and structural properties of the porous silicon layers using scanning electron microscopy (SEM), X-ray diffraction (XRD) and gravimetric method.
Through the electron microscope images, it was found that there are different shapes, as the shape varies according to the time of the interaction
Pore width and thickness of porous silicon layer increase using nitric acid with HF more than using HF with ethanol.
The measured porosity by using gravimetric methods varies according to the acids used to produce porous silicon, it appeared with higher values in nitric acid than using ethanol with HF.
The optical and electrical properties of citrus samples were studied and it was found that these properties are affected by the thickness of the layer.
The electrical capacitance is affected by the porosity and the thickness of the layer, if it decreases, the larger the porous layer is due to the amount of charges and ions present, but when the porous layer becomes small, it decreases due to the presence of air.
The electrical capacitance of silicon nanoparticles produced by HF with ethanol is much higher than that of HNO3 with HF.
The difference in the measurement of the nanoscale dimensions of the pores during different times of HF + Ethanol acid is more uniform and its nano properties are clearer because the smaller the pores, the clearer the nanoscale characteristics.
Silicon reacts with nitric acid to produce the oxide that dissolves in hydrofluoric acid. Thus, the reaction with nitric acid in the presence of HF gave the best and finest porous silicon.
In general, the properties of porous silicon production from the reaction for silicon with acids this causes to make optimization for this porous characteristics in the light of the any application of nano crystalline silicon.