Patent ID: 7202691

Claim:
A method for acquiring charge-voltage data on a miniature test site of a semiconductor wafer, the method comprising the following steps wherein each step is realized without contacting a surface of the semiconductor wafer: a) locating a test site on the surface of semiconductor wafer; the test site being no greater than approximately 10,000 μm 2 ; b) positioning the test site under a voltage micro-probe and at a working distance to a tip of the micro-probe; c) measuring a surface voltage V CPD0 of the test site; d) positioning the test site under a corona discharge device and depositing a dose of ionic charge ΔQ c1 on a surface of the test site; e) positioning the test site under the voltage micro-probe and at the working distance to the tip of the micro probe; and f) measuring a surface voltage V CPD1 of the test site after charging.