| 摘要 |
A method of fabricating a shallow trench isolation structure. A pad oxide layer, a mask layer, a dielectric anti-reflection coating layer and a cap oxide layer are formed on a substrate sequentially. A trench is formed in the substrate. A liner oxide layer is formed along a surface of the trench. An isolation layer is formed over the substrate to fill the trench. Using the mask layer as a polishing endpoint, the insulation layer, the dielectric anti-reflection coating layer and the cap oxide layer over the mask layer are removed. The thickness of the mask layer is controlled within a first fixed range, and the thickness of the dielectric anti-reflection coating layer is controlled, within a second fixed range, such that the light source of the optical endpoint detection system can produce a maximum reflected light signal. The mask layer and the pad oxide layer are then removed.
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