The optical effect of porous silicon doped nano-silver particles / Mohammad Zaifah Ahmad

Porous Silicon (PSi) has been formed by anodically etching p-type Si [100] wafer in hydrofluoric (HF) solution at 1:1 ratio of ethanol. The samples were prepared at various etching time which is at 5 minutes, 10 minutes, 15 minutes and 20 minutes, that will give different percentage of porosity. The samples undergo Photoluminescence Spectroscopy (PL) and Fourier Transform Infrared (FTIR) as a guideline for the comparison process. Then, the samples are immersed in silver-nanoparticles solution for 30 minutes and 2 hours to dope the Porous Silicon pores. The effects of silver-nano particles in optical properties of Porous Silicon were characterized by using Photoluminescence Spectroscopy (PL). While Fourier Transform Infrared (FTIR) is used to characterize samples bonding and intensity. For PL result, it shows that as the time of immersion the Porous Silicon into the nano silver extend, the value of intensity decreasing and the wavelength is shifted. For the FTIR, the result shows the value of the high peak and the low peak of transmittance are change after the doping process. The more time of immersion spend, the higher the peak goes.