Patent ID: 8653455
Filing Date: 2014-02-18
Classification: H01J,H01L

Abstract:
1. A charged particle beam device comprising: a unit which generates a deceleration electric field for a primary charged particle beam; a specimen holding mechanism of electrostatic attraction type having a surface on which to hold a specimen to be evaluated, a circular first electrode plate and a ring-shaped second electrode plate, the two electrode plates being insulated from each other and arranged concentrically; a unit which applies a predetermined voltage to a control electrode disposed between the specimen and an objective lens; a unit which applies to the first electrode plate a voltage of a positive polarity with respect to a reference voltage and of an arbitrary magnitude, the reference voltage being used to generate the deceleration electric field; and a unit which applies to the second electrode plate a voltage of a negative polarity with respect to the reference voltage and of an arbitrary magnitude; wherein an outer diameter of the second electrode plate is larger than an outer diameter of the specimen; and wherein a ring-shaped area of the second electrode plate enclosed by an inner diameter of the second electrode plate and the outer diameter of the specimen is substantially equal to an area of the first electrode plate.