Patent ID: 6639228
Filing Date: 2003-10-28
Classification: H01J,H01L

Abstract:
A method for estimating molecular nitrogen implantation dosage, comprising:implanting molecular nitrogen into a plurality of semiconductor wafers in a predetermined implantation voltage, the molecular nitrogen having a series of dosages; subjecting the semiconductor wafers and a non-implanted semiconductor wafer to thermal process to grow an oxide layer on each surface of the semiconductor wafers; measuring the thickness of the oxide layer on the surface of the semiconductor wafers; computing a suppression ratio from the difference in thickness of the oxide layer between the implanted and non-implanted semiconductor wafers; building a relation between the suppression ratio and the implantation dosages of molecular nitrogen; and computing an estimated molecular nitrogen implantation dosage needed to grow a predetermined thickness of oxide layer on a process wafer, by inputting the predetermined thickness into the relation.