Patent ID: 6110776
Filing Date: 2000-08-29
Classification: H01L

Abstract:
A manufacturing method for forming a bottom electrode of a capacitor, comprising steps of:providing a substrate having a conducting region;forming a first insulation layer, a stop layer and a second insulation layer over the substrate, in order;defining the second insulation layer, the stop layer and the first insulation layer, so as to form opening exposing the conducting region in the substrate;forming a T-shaped conductive layer over the second insulation layer and filling the opening to make electrical connection with the conductive region, wherein the T-shaped conductive layer comprises a metal plate and a plug;etching the second insulation layer by anisotropic etching with the metal plate as a mask to form a third insulation layer having an upper portion and a bottom portion, wherein the third insulation layer has a first distance measured from upper surface of the bottom portion of the third insulation layer to upper surface of the stop layer;etching the third insulation layer by isotropic etching to form a fourth insulation layer having an upper portion and a bottom portion, wherein the fourth insulation layer has a second distance measured from upper surface of the bottom portion of the fourth insulation layer to the upper surface of the stop layer, and the plug is still covered by the upper portion of the fourth insulation layer;forming a conductive layer on the metal plate and the fourth insulation layer;etching the second conductive layer by anisotropic etching, so as to expose the metal plate and a portion of the fourth insulation layer; andetching the fourth insulation layer by isotropic etching, so as to expose the stop layer and the plug.