High throughput/high resolution particle beam system
AssigneeThe Perkin-Elmer Corporation
InventorNelson C. Yew
Life of this patent
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Abstract
A particle beam lithographic system and method using smaller address structure particle beam for generating masks for integrated circuit technology utilizing an electrostatic deflector system to sweep the beam in the serpentine path for increased throughput.
Claims10
In a raster scan particle beam system for selectively irradiating a radiation sensitive resist layer located on a continuously moving stage the throughput of which system is determined by a selected spot size diameter and beam deflection length together with the movement of the particle beam in rows in raster scan fashion as the stage moves at a given speed at a right angle to the direction of movement of said beam, means for improving the throughput thereof, comprising,
- means for sequentially scanning a particle beam of lesser diameter than said first mentioned spot size diameter in a serpentine path to define a stripe, and
- means for intensity modulating said particle beam in accordance with a selected specified pattern.
In a raster scan system having a continuously moving stage, a method for improving the throughput of said system in the fabrication of microminiature devices which involves selectively irradiating multiple regions of a radiation sensitive resist layer located on said stage the throughput of said system having been determined by a selected spot size diameter and beam deflection length together with the movement of a particle beam in rows in raster scan fashion across said larger continuously moving at a given speed in a direction at a right angle to the direction of movement of said beam, comprising the steps of;
- controlling said beam to have a lesser diameter than said selected spot size diameter and to irradiate in sequence a plurality of lines by following a serpentine path in adjacent columns, and
- repeating said irradiation with respect to abutting sets of columns to define a pattern of multiple regions.
A method of improving the throughput and resolution of a raster scan electron beam lithographic machine, the throughput of which is determined by a selected beam spot size diameter and beam deflection length together with the movement of the electron beam in rows in raster scan fashion across a medium continuously moving at a given speed in a direction at a right angle to the direction of movement of said beam, comprising the steps of;
- selecting a smaller beam spot diameter than said first mentioned selected beam diameter, and
- moving said smaller beam in a direction to form side-by-side columns of smaller beam spots by alternately directing said beam in the same direction and against the direction of movement of said medium until the number of columns equals the beam deflection length which in part determined the throughput of the lithographic machine and maintaining the speed of movement of said medium at the same speed as that which in part determined the throughput of the lithographic machine to define a pattern of higher resolution on the medium but with the same throughput of the machine.
Dependencies are inferred from the claim text.