Chemical mechanical polishing method using slurry composition containing n-oxide compound

Abstract

The present disclosure relates to a method of performing a chemical mechanical planarization (CMP) process with a high germanium-to-oxide removal selectivity and a low rate of germanium recess formation. The method is performed by providing a semiconductor substrate having a plurality of germanium compound regions including germanium interspersed between a plurality of oxide regions including an oxide. A slurry is then provided onto the semiconductor substrate. The slurry has an oxidant and an etching inhibitor configured to reduce a removal rate of the germanium relative to the oxide. A CMP process is then performed by bringing a chemical mechanical polishing pad in contact with top surfaces of the plurality of germanium compound regions and the plurality of oxide regions.