Electron beam writing equipment using plural beams and method
View Patent ↗An electron beam writing system, using discrete electron beams in which the interval of the beams is larger than the size of the beams, generates plural electron beams, on/off controls each of the electron beams according to pattern data to be written, and deflects the electron beams together, thereby performing writing on a wafer. One side of a unit writing area of the electon beams is larger than substantially twice the interval of the electron beams or substantially an integral multiple thereof.
1. Electron beam writing equipment comprising:
means for generating plural electron beams;
means for controlling on/off of each of said plural electron beams according to pattern data to be written; and
means for forming desired patterns on a wafer by scanning a writing area which includes a plurality of unit writing areas in each of which one of said plural electron beams is scanned, said on/off controlled electron beams together forming said desired patterns on a wafer,
wherein a center of the writing area is shifted to an already written area, and
wherein a center of each of the unit writing areas is shifted by substantially an integral multiple of the beam interval of the plural electron beams or by substantially an integral multiple and substantially 1/integer of the beam interval of the plural electron beams.
2. The electron beam writing equipment according to claim 1 , further comprising a plurality of Faraday cups arrayed to receive said plural electron beams to detect variation in said plural electron beams.
3. An electron beam writing method comprising the steps of:
generating plural electron beams;
on/off controlling each of the plural electron beams according to pattern data to be written; and
forming desired patterns on a wafer by scanning a writing area which includes a plurality of unit writing areas in each of which one of the plural electron beams is scanned,
wherein a center of the writing area is shifted to an already written area, and
wherein a center of each of the unit writing areas is shifted by substantially an integral multiple of the beam interval of the plural electron beams or by substantially an integral multiple and substantially 1/integer of the beam interval of the plural electron beams.
4. The electron beam writing method according to claim 3 ,
wherein one side of each of said unit writing areas is larger than the beam interval of said plural electron beams.
5. The electron beam writing method according to claim 3 ,
wherein the positions of said patterns are optically measured.
6. The electron beam writing method according to claim 3 ,
wherein the positions of said patterns written at a position closer to the center of a position of a second adjacent electron beam than to the center of a position of a first electron beam of said electron beams is measured optically so as to correct said pattern.
7. Electron beam writing equipment, comprising:
an aperture array;
a blanker array arranged to receive the plural electron beams and to on/off control passage of the electron beams; and
an optical system arranged to scan a writing area of a subject so as to form a desired pattern;
wherein the writing area includes a plurality of unit writing areas in each of which one of said plural electron beams is scanned,
wherein a center of the writing area is shifted to an already written area, and
wherein a center of each of the unit writing areas is shifted by substantially an integral multiple of the beam interval of the plural electron beams or by substantially an integral multiple and substantially 1/integer of the beam interval of the plural electron beams.
8. The electron beam writing equipment, according to claim 7 , further comprising: a plurality of Faraday cups arrayed to receive said plural electron beams to detect variation in said plural electron beams.
9. The electron beam writing method according to claim 3 ,
wherein positions of said patterns are measured to obtain relative positions between said electron beams so that said patterns are corrected.
10. The electron beam writing method according to claim 1 ,
wherein one side of each of said unit writing areas is larger than the beam interval of said plural electron beams.
11. The electron beam writing method according to claim 7 , wherein one side of each of said unit writing areas is larger than the beam interval of said plural electron beams.