Etching Volume Effect on the Morphology of Silicon Etched by Metal-Assisted Chemical Method
Assisted by Ag nanoparticles, Si substrates were etched in aqueous solutions containing hydroﬂuoric acid (HF) and hydrogen peroxide (H2O2) with different volumes of etching solution. The etching morphology of Si wafers was found to be affected by the volumes. In etching solutions with smaller volume, the pores were created; in etching solutions with larger volume, the nanostructure composed of nanowires and nanopores (pores+wires nanostructure) were generated. In addition, the lengths of these Si nanostructures increased with the increase of the etching volume. Possible formation mechanism for this phenomenon was discussed.
Xianghua Liu, Zhenhua Bai, Yuanhua Shuang, Cunlong Zhou and Jian Shao
W. Wang et al., "Etching Volume Effect on the Morphology of Silicon Etched by Metal-Assisted Chemical Method", Applied Mechanics and Materials, Vols. 217-219, pp. 1141-1145, 2012