We investigated the physical and chemical properties of the interface between porous silicon layer and silicon substrate by using atomic force microscope and X-ray diffraction. From the results, we found that there are bigger Si crystals at the interf...
We investigated the physical and chemical properties of the interface between porous silicon layer and silicon substrate by using atomic force microscope and X-ray diffraction. From the results, we found that there are bigger Si crystals at the interface than those at the porous silicon as the anodization time gets longer with constant current density. Also, the lattice parameter of the interface is different from that of porous silicon. Secondary ion mass spectroscopy analysis shows more Si ions at the interface than at the porous silicon and silicon substrate. We attribute these results to shortage of HF solution at the interface through porous silicon structure during porous silicon formation.