Method for fabricating semiconductor device with deep opening

摘要

A method for fabricating a semiconductor device with a deep opening is provided. The method includes: forming an insulation layer on a substrate; selectively etching the insulation layer to form first openings; enlarging areas of the first openings; forming anti-bowing spacers on sidewalls of the enlarged first openings; and etching portions of the insulation layer remaining beneath the enlarged first openings to form second openings.