Patent ID: 8244500
Filing Date: 2012-08-14
Classification: G05B,Y02P

Abstract:
1. A method of adjusting wafer process sequence, comprising steps of: collecting a plurality of production parameters for a plurality of lots of wafers; selecting a plurality of key parameters from the production parameters, wherein the key parameters at least includes a processing sequence; defining a formula to obtain an epsilon value, wherein the formula is  p defining a minimum point number; categorizing the lots of wafers into a plurality of groups according to the epsilon value and the minimum point number by using density-based spatial clustering of application with noise; and adjusting the processing sequences of the lots of wafers in the groups; wherein the density-based spatial clustering of application with noise calculates a difference of the key parameters between two of the lots of wafers by a second formula, the second formula is distinct is the difference of the key parameters, p i is one of the key parameters of one lot of wafers, and p′ i is one of the key parameters of another lot of wafers.