Patent ID: 6479875
Filing Date: 2002-11-12
Classification: H01L,Y10S

Abstract:
A gettering structure comprising:a recess in a semiconductor substrate, said recess having a bottom; and a gettering region below and separated from said bottom, said gettering region having: a vertical concentration profile of a gettering material that has a first minimum below said bottom, a maximum below said first minimum, and a second minimum below said maximum; a horizontal concentration profile of a gettering material that has a first minimum proximate the recess, a maximum substantially centered upon the recess, and a second minimum proximate the recess; and the gettering region having a top portion and a bottom portion, the top portion having a first width and the bottom portion having a second width greater than the first width; wherein said semiconductors substrate is substantially devoid of crystal originated particles or pits above said gettering region.