Patent ID: 6248601
Filing Date: 2001-06-19
Classification: G01R

Abstract:
A method for determining defects on the surface of a glassification layer, comprising the steps of:providing a wafer to be tested for said defects, said wafer containing a glassification layer;providing a copper plate;providing a container, whereby sides of said container having a first and a second small surface area and a first and a second large surface area, whereby planes of the first and second small surface areas being parallel, whereby planes of the first and second large surface areas being parallel, said container containing a copper-sulfate solution comprising CuSO.sub.4 mixed with H.sub.2 O;positioning said wafer to be tested within said container;positioning said copper plate within said container; andapplying a voltage between said wafer to be tested and said copper plate by applying direct current e.m.f. between said wafer and said copper plate for a selected period of time, thereby causing creation of Cu.sup.2+ ions within said copper-sulfate solution whereby said Cu.sup.2+ ions are forced to diffuse to the surface of said wafer, causing electroplating of the surface of said wafer, further causing electro-deposition of said Cu.sup.2+ ions on unprotected parts of the surface of said wafer.