| 摘要 |
An etching method used in the high density plasma etching system to etch a silicon oxide dielectric layer to form openings of different depths. The method uses a mixture of C4H8, CH2F2, and Ar as an etching gas source to etch the silicon oxide dielectric layer, forming a plurality of openings of a first depth. A mixture of C4H8, CO, and Ar is used as an etching gas source to etch the silicon oxide dielectric layer exposed by the first opening, so that the opening is deepened to the second depth. Using a mixture of C4H8, CH2F2, CO, and Ar as the etching gas source, the silicon oxide dielectric layer exposed by the opening is etched, so that the openings are deepened to the third depth and the fourth depth.
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