Patent ID: 8748815
Filing Date: 2014-06-10
Classification: G01R

Abstract:
1. A method for inspecting electrical defects on a semiconductor wafer with a scanning electron microscope (SEM), the semiconductor wafer including a plurality of contacts to MOS devices, the method comprising: providing positive charging over at least an area of gate contacts sufficient enough to turn on the associated MOS devices on the wafer; scanning at least an area of source or drain contacts of the MOS devices with a primary electron beam of proper landing energy to charge the source or drain contacts and generate a single images, wherein one source and drain of the MOS devices are conducted to the source or drain contacts accessible from the surface of a dielectric layer covering the MOS devices, and another one of the source and drain of the MOS devices are buried below the dielectric layer and electrically coupled with a substrate; and analyzing the single image of contacts and identifying the open source or drain contacts.