Patent ID: 6426232
Filing Date: 2002-07-30
Classification: B24B,B24D,G01B,G03F,H01L

Abstract:
A method for obtaining thickness data for a semiconductor body, comprising:providing a semiconductor body comprising a front side portion and a back side portion on a semiconductor body support platform including a passageway for transmission of light from a light source therethrough, said support platform comprising a chuck for holding the semiconductor body during polishing of a front side surface of said front side portion; transmitting light from said light source through said passageway and onto said back side portion such that said light is at least partially transmitted through said back side portion, partially reflected by a back side surface of said front side portion to form a primary reflection, and partially transmitted through said front side portion then at least partially reflected from a front side surface of said front side portion to form a secondary reflection; detecting said primary and secondary reflections; and calculating thickness data for the front side portion from said primary and secondary reflections.