Patent ID: 6232228
Filing Date: 2001-05-15
Classification: C09K,H01L

Abstract:
A method of manufacturing semiconductor devices, comprising:forming an insulating layer over a semiconductor substrate;forming contact holes in the insulating layer;forming a conductive layer over the insulating layer to burying the contact holes;rotating the semiconductor substrate; andetching the conductive layer by supplying an etching composition on the rotating semiconductor substrate,wherein the etching composition comprises a mixture of at least one oxidant selected from the group consisting of H.sub.2 O.sub.2, O.sub.2, IO.sub.4.sup.-, BrO.sub.3, ClO.sub.3, S.sub.2 O.sub.8.sup.-, KIO.sub.3, H.sub.5 IO.sub.6, KOH, and HNO.sub.3, at least one enhancer selected from the group consisting of HF, NH.sub.4 OH, H.sub.3 PO.sub.4, H.sub.2 SO.sub.4, NH.sub.4 F, and HCl, and a buffer solution, andwherein the oxidant, the enhancer, and the buffer solution have a mixing ratio such that after the etching, the material of the conductive layer is only present inside the contact hole and does not remain over the insulating layer.