Patent ID: 9485846
Filing Date: 2016-11-01
CPC Classification: G01N,H01J,H05F

Claim Text:
1. A method for inspecting an EUV mask by using a charged particle beam, wherein the EUV mask comprises a reflective surface, the charged particle beam is an electron beam, and the reflective surface comprises a patterned reflective surface area and a peripheral area, the method comprising: grounding the EUV mask via the peripheral area, wherein the peripheral area is electrically connected to the patterned reflective surface area; moving continuously a stage, wherein the stage is for supporting the EUV mask, and simultaneously scanning the patterned reflective surface area of the EUV mask by using the charged particle beam; and receiving signal electrons emanated from the patterned reflective surface area of the EUV mask; wherein, the stage's moving direction is perpendicular to a scanning direction of the electron beam, the EUV mask is inspected by a low voltage scanning electron microscope; and wherein, said step of grounding the EUV mask is performed by slightly contacting a grounding pin to a conductive layer on one side wall of the EUV mask, wherein a trench is formed in the side wall of the EUV mask.