Patent ID: 8143136
Filing Date: 2012-03-27
Classification: H01L

Abstract:
1. A method for fabricating a crown-shaped capacitor, comprising: providing a first dielectric layer with a conductive contact disposed therein; forming a protective pillar over the first dielectric layer, wherein the protective pillar physically contacts the conductive contact and comprises a first conductive layer, a protective layer, and a mask layer sequentially disposed over the conductive contact; forming a second conductive layer over a side of the protective pillar, wherein the second conductive layer physically contacts the first conductive layer, the protective layer and the mask layer; conformably forming a first capacitance layer and a third conductive layer over the first dielectric layer to cover the conductive contact, the first dielectric layer, the second conductive layer, and the mask layer; forming a sacrificial layer over the third conductive layer; partially removing the sacrificial layer, the third conductive layer, the first capacitance layer, the second conductive layer, and the mask layer above the protective layer; removing the second conductive layer and the third conductive adjacent to the protective layer, forming a recess adjacent to the first capacitance layer; removing the protective layer and forming an opening, wherein the opening exposes the first conductive layer and a side surface of the second conductive layer not in contact with the first capacitance layer; conformably forming a second capacitance layer and a fourth conductive layer in the opening, wherein the second capacitance layer fills the recess adjacent to the first capacitance layer and physically contacts the first capacitance layer; removing the sacrificial layer and exposing a sidewall surface of the third conductive layer not in contact with the first capacitance layer; and forming a fifth conductive layer to cover the fourth conductive layer, the second capacitance layer, and the third conductive layer.