Patent ID: 6060405
Filing Date: 2000-05-09
Classification: C23C,H01L

Abstract:
A method of deposition on a wafer, wherein a 4-pass deposition step is performed on a wafer to form a deposition layer, the method comprising:performing a first deposition step on the wafer to cover a portion of the wafer, and to leave only a crescent of the wafer exposed;performing a second deposition step on the wafer with a same coverage of the wafer as the first deposition step, except that the wafer has been rotated with an angle with 90.degree. along a direction;performing a third deposition step on the wafer, the third deposition step having a same coverage as the first and the second deposition steps, except that the wafer has been rotated with an angle of 90.degree. along the direction again after the second deposition step; andperforming a fourth deposition step on the wafer, the fourth deposition step having a same coverage as the first, the second and the third deposition steps except that the wafer has been further rotated with an angle of 90.degree. along the direction after the third deposition.