Patent ID: 6025278
Filing Date: 2000-02-15
Classification: H01L

Abstract:
A method for manufacturing a semiconductive wafer comprising:providing a semiconductive material wafer having a front surface and a back surface;contacting the front surface with a first fluid;contacting the back surface with a second fluid different than the first fluid, at least one of the first and second fluids being configured to etch the semiconductive material of the wafer; at least one of the first and second fluids having a measurable component at a first concentration which is different than any concentration of said measurable component in the other of the first and second fluids;etching the semiconductive wafer with the at least one of the first and second fluids configured to etch the semiconductive material, the first and second fluids converging after forming an opening extending completely through the wafer; andmonitoring the measurable component concentration in at least one of the first fluid or the second fluid to ascertain if the etching has formed an opening extending completely through the wafer.