Patent ID: 9048286
Filing Date: 2015-06-02
Classification: H01L

Abstract:
1. A method for manufacturing a substrate, comprising the steps of: forming a hard mask layer on a bulk silicon material; etching the hard mask layer and the bulk silicon material to form a first part for shallow trench isolation of at least one trench; forming a dielectric film on the sidewall of the at least one trench, further etching the bulk silicon material to deepen the at least one trench so as to form a second part of the at least one trench; completely nitridizing only parts of the bulk silicon material which are between the second parts of the trenches, and only parts of the bulk silicon material which are between the second parts of the trenches and side surfaces of the bulk silicon substrate, thereby forming a first dielectric material; filling a second dielectric material different from the first dielectric material in the first and second parts of the at least one trench; and removing the hard mask layer.