Airtight and microporous seal device for immersion lithography machine

Abstract

The invention discloses an airtight and microporous seal device for an immersion lithography machine. The airtight and microporous seal device is arranged between the projecting lens group and a silicon wafer of the immersion lithography machine and comprises an immersion unit base body, an immersion unit upper end cover, an immersion unit lower end cover and an immersion unit airtight seal end cover, wherein the upper surface of the immersion unit base body is in contact with the immersion unit upper end cover; the lower surface of the immersion unit base body is in contact with and firmly connected with the immersion unit lower end cover and the immersion unit airtight seal end cover in sequence. The airtight microporous seal device can perform the functions of sealing a gap flow field in the immersion lithography system as well as injecting and recovering a liquid; an airtight seal structure and a microporous structure are adopted to prevent liquid leakage; negative pressure is applied to micropores to recover the liquid and constrain the gap flow field; the airtight seal structure is used for sealing the gap flow field and meanwhile ensuring the edge stability of the gap flow field; the stability and updating of immersion liquid in the gap flow field are realized through large-flow liquid injection and recovery.

Description

technical field [0001] The invention relates to a flow field sealing and liquid injection recovery device, in particular to an air sealing and micropore sealing device for an immersion photolithography machine. Background technique [0002] The lithography machine is one of the core equipment for manufacturing VLSI. The modern lithography machine is mainly based on optical lithography. It uses the optical system to accurately project and expose the pattern on the mask to the silicon coated with photoresist. Chip. It includes a laser light source, an optical system, a projection mask composed of chip patterns, an alignment system and a silicon wafer coated with photosensitive photoresist. [0003] Immersion lithography (Immersion Lithography) equipment fills a liquid with a high refractive index between the last projection objective lens and the silicon wafer, which improves the numerical aperture of the projection objective lens ( NA), thereby improving the resolution and ...

AI Technical Summary

Problems solved by technology

[0007] In order to solve the problem of gap flow field sealing and liquid renewal rate in partial immersion lithography technology, the object of the present invention is to provide a kind of air sealing and micropore sealing device for immersion lithography machine, using a square at the edge of the flow field The microporous structure and air-tight structure prevent liquid leakage in the gap flow field, and use large-flow liquid injection and recovery structures to solve the problem of liquid renewal rate

Images