Seedless electroplating on a rectangular etched grating on n-Si/undoped Silicon substrate
Abstract
A method for seedless electroplating of Au between sidewalls of etched Si substrates was demonstrated. The etched rectangular pattern is approximately 4um (line) by 4um (spacing) with 4um height. Soaking the substrates into a phosphoric acid solution followed by heat treatment and rapid thermal annealing provides sufficient conductivity on the surfaces of the rectangular walls to allow seedless electroplating of gold. Samples were soaked in Au solution at 70oC and electroplated with increasing current density.