Patent ID: 9389173
Filing Date: 2016-07-12
CPC Classification: G01N,H01L

Claim Text:
1. A method for detecting resistance of photo resist layers, comprising steps of: providing a silicon wafer and measuring a refractive index of a surface of the silicon wafer as an initial refractive index of the surface of the silicon wafer; forming the photo resist layers with different thicknesses on the surface of the silicon wafer; performing ion-implantation on the photo resist layers by predetermined amounts; peeling off the photo resist layers from the surface of the silicon wafer; and testing refractive indexes of different areas on the surface of the silicon wafer after the ion-implantation, on which the photo resist layers with different thicknesses are located, and determining the resistance of the photo resist layers with different thicknesses in contrast to the initial refractive index before the ion-implantation, wherein after the step of testing the refractive indexes of different areas on the surface of the silicon wafer after the ion-implantation, the method further comprises: calculating differences between the refractive indexes of corresponding areas on the surface of the silicon wafer covered by the photo resist layers with different thicknesses after the ion-implantation and the initial refractive index before the ion-implantation, and if one of the differences has an absolute value range of 0-0.02, determining that the photo resist layer with a corresponding thickness is resistant sufficiently and efficiently and that such a corresponding thickness is an effective thickness of the photo resist layer.