Patent ID: 8537213
Filing Date: 2013-09-17
Classification: G01N,H01L

Abstract:
1. A method for measuring a via bottom profile, for obtaining a profile of a bottom of a via in a front side of a substrate, the method comprising: using an IR-microscope to transmit an infrared (IR) light source from a back of the substrate to the bottom of the via through an objective; using an image capturing device to capture lights scattered from the bottom of the via to generate an image, wherein the image displays a diameter (2E using an elliptic equation to obtain a minor axis radius (E the elliptic equation is represented by an equation (1): in the equation (1), E a slope equation (2) is obtained according to the equation (1): in the equation (2), m is the slope of the equation (1), and when x is a radius (E in the equation (3), M is a fixed parameter of the IR-microscope.