Copper electrodeposition into macroporous silicon arrays for through silicon via applications ?
The present paper deals with the formation of high conductivity through silicon via from macroporous silicon arrays. The through wafer macropores were first etched by anodization into a hydrofluoric acid  ethanol mixture. The conditions of straight and ordered macropore etching were studied. The high aspect ratio (18) and high density via (above 105/cm2) were then filled by copper using an optimized potentiostatic technique involving a specific electrolyte with additives. The copper micro-wires were observed by SEM whereas XRD analysis enabled the determination of the average grain size.
copper electrodeposition macroporous silicon through silicon via