Patent ID: 8426810
Filing Date: 2013-04-23
Classification: G01N,H01L

Abstract:
1. A method of planar imaging on semiconductor chips using focused ion beam (FIB), comprising the steps of: (A) disposing at least a positioning symbol on a semiconductor chip to designate a testing area thereon; (B) disposing a metal membrane on the testing area; (C) trimming the testing chip to form a first testing chip; (D) cutting a blind opening proximate the testing area on the first testing chip along a border of the metal membrane to form a second testing chip, wherein the base surface of the opening is substantially planar, wherein the at least one positioning symbol is positioned proximate a border of the metal membrane away from the opening; (E) erecting the second testing chip on an inclinable platform with the opening facing upward; (F) rotating the erected second testing chip with the inclinable platform so that the normal vector of the metal membrane is perpendicular to the incident direction of the FIB, wherein a non-zero included angle is formed between the normal vector of the base surface of the opening and the incident direction of the FIB, thereby allowing ion beams from the FIB to emit into the opening in an angle of inclination; and (G) emitting ion beams in the direction of the incident ray to form planar images of different depths parallel to the metal membrane on the testing area.