Problems encountered in the conventional inspection method and the conventional
apparatus adopting the method are solved by the present invention using an electron
beam by providing a novel inspection method and an inspection apparatus adopting
the novel method which are capable of increasing the speed to scan a specimen such
as a semiconductor wafer.
The inspection novel method provided by the present invention comprises the steps
of: generating an electron beam; converging the generated electron beam on a specimen
by using an objective lens; scanning the specimen by using the converged electron
beam; continuously moving the specimen during scanning; detecting charged particles
emanating from the specimen at a location between the specimen and the objective
lens and converting the detected charged particles into an electrical signal; storing
picture information conveyed by the electrical signal; comparing a picture with
another by using the stored picture information; and detecting a defect of the specimen.