Abstract
In this work photo-electrochemical etching was used to synthesize uniform and non-uniform macro porous silicon from n-type with orientation (100). Specimens were anodized in a sol of 25% HF: C2H2OH at 1:1 rate. Morphology and porosity of the samples were studied. Optical characteristics (reflection and photoluminescence) of PS samples by changing current density (10, 12, 14 and 16 mA/cm2 ) for fixed etching time (8min) and power density (17mW/cm2 ) by using red laser illumination wavelength (645nm) were investigated. Porous silicon samples imaged via scanning electron microscope (SEM), which showed the topography of silicon surface and pores distribution.
Highlights
Porous silicon (PS) is silicon with pores inserted into its complex structure in macroscale sized like sponge structures, which are used as high potential anti-reflection material due to their enhanced absorption properties
The main objective of this work is to study the effect of current density on PS formation; which plays a significant role in controlling the porous morphology and considered as an important feature for nanostructured antireflection solar cells
The surface morphology reflected the formation of the new porous structure when the current density increases to higher value about (16 mA/cm2)
Summary
Porous silicon (PS) is silicon with pores inserted into its complex structure in macroscale sized like sponge structures, which are used as high potential anti-reflection material due to their enhanced absorption properties. It is fabricated when crystalline silicon wafers are etched photoelectrochemically in hydrofluoric acid HF-based electrolyte sol this method can be controlled through several parameters such as current density, power density, etching time and Hf concentration, etc. Photoelectrochemical etching an easy method, where light or laser illuminated the silicon electrode during the anodization procedure. The main objective of this work is to study the effect of current density on PS formation; which plays a significant role in controlling the porous morphology and considered as an important feature for nanostructured antireflection solar cells
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