United Microelectronics Corp.

Chia-Hsiun Yu

Ming-Hsing Liu

The present invention provides a fabrication method of an opening. The method includes providing a substrate having a conductive region therein. Thereafter, a dielectric layer is formed over the substrate and then a stacked layer is formed on the dielectric layer. The stacked layer includes a patterned metal hard mask layer, a patterned silicon oxynitride layer and a patterned silicon oxide layer on the dielectric layer in sequence. Afterward, a first portion of the dielectric layer is removed using the stacked layer as a first mask to form a first opening that exposes a surface of the conductive region.

Method for fabricating opening

A method for fabricating a single-damascene opening is described. The method includes providing a substrate having a conductive line formed therein. A barrier layer, a dielectric layer, a metal hard mask layer, a silicon oxynitride layer, a bottom antireflection layer and a patterned photoresist layer are sequentially formed on the substrate. The bottom antireflection layer, the silicon oxynitride layer and the metal hard mask layer that are not covered by the patterned photoresist layer are removed in a single process step, until a part of the surface of the dielectric layer is exposed. Thereafter, the patterned photoresist layer and the bottom antireflection layer are removed. Further using the silicon oxynitride layer and the metal hard mask layer as a mask, a portion of the dielectric layer and a portion of the barrier layer are removed to form a damascene opening that exposes the surface of the conductive line.

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Tainan, Taiwan

Chia-Hsiun Yu