Patent ID: 6958280
Filing Date: 2005-10-25
Classification: H01L

Abstract:
1. A method for manufacturing alignment mark of semiconductor device, the method comprising the steps of: sequentially forming a pad oxide film and a pad nitride film on a semiconductor substrate; selectively etching the pad nitride film and the pad oxide film to form a pad nitride film pattern and a pad oxide film pattern exposing a predetermined portion of the semiconductor substrate; etching the semiconductor substrate using the pad nitride film pattern as a mask to form an alignment mark trench having a predetermined depth; forming an oxide film for device isolation film filling the alignment mark trench on the entire surface; planarizing the oxide film for device isolation film until the pad nitride film pattern is exposed to form a device isolation film; and etching a predetermined thickness of the device isolation film to form an alignment mark prior to removing the pad nitride film pattern.