Patent ID: 8384052
Filing Date: 2013-02-26
Classification: B82Y,H01J

Abstract:
1. An electron beam lithography apparatus including: a sample chamber having a wafer stage on which a write target sample is placed; and an electron beam optical barrel configured to irradiate the sample with an electron beam, the electron beam lithography apparatus comprising: an electron gun configured to emit the electron beam; a deflector configured to deflect the electron beam; a focus corrector configured to correct a focus of the electron beam; a stage position dependent correction coefficient memory configured to store a constant correction coefficient, which is determined according to a write position on the sample or a position of a character projection (CP) pattern to be selected and independent of time passage, and which is stored in a storage area to be specified by an address of the write position on the sample or the position of the CP pattern; a measurer configured to measure fluctuation factor data of a factor affecting operation of the electron beam lithography apparatus; a coefficient converter configured to determine the fluctuation correction coefficient according to a value of the fluctuation factor data measured by the measurer; an integral storage unit configured to store exposure data and store a correspondence between the value of the fluctuation factor data and the fluctuating correction coefficient; an integrator configured to calculate the integrated correction coefficient according to integration of the constant correction coefficient and the fluctuating correction coefficient; and an output correction computing unit configured to correct the exposure data based on the integrated correction coefficient, thereby calculating a deflection efficiency indicating a relation between an input signal to the deflector and an amount of beam deflection, and a focus correction intensity indicating a relation between an input signal to the focus corrector and a beam focus, and to write the electron beam on the sample according to the deflection efficiency and the focus correction intensity.