Method and device for photoresist coating

Abstract

The invention discloses a method and a device for photoresist coating. The method and the device for the photoresist coating are used for reducing reject ratio of semiconductor chips. The method for the photoresist coating includes the following steps: placing a wafer on a working table, and conducting at least twice of photoresist coating to the wafer. Each time of photoresist coating comprises steps: rotating the working table, and enabling a photoresist transmission and distribution nozzle above the working table to erupt photoresistance. Thus, photoresist thickness uniformity of coating can be markedly improved, photoresist residual thickness at the thinnest position after etching is enough to block protection layer etching, and therefore the problem of over etching of a protection layer is solved, pattern definition integrity after etching is ensured, and reject rate of semiconductor chips is reduced.

Description

technical field [0001] The present invention relates to the technical field of semiconductor device production, in particular to a method and device for photoresist coating. Background technique [0002] At present, semiconductor devices are manufactured by a photolithography (MASK) process, and the photolithography process includes photoresist coating, masking, exposure, development, etching, and stripping processes. Specifically, it includes: uniformly coating the photoresist on the surface of the chip, so that the chip can be patterned by an exposure machine, and then a circuit is defined after etching. [0003] Generally, the production of a semiconductor device requires multiple lithography processes. The wafer undergoes the front-end production process, and the corresponding circuit layout is etched on the wafer, resulting in uneven surface of the wafer. In this way, the wafer in the back-end production process must be in the process of correcting The uneven wafer sur...

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Problems solved by technology

[0003] Generally, the production of a semiconductor device requires multiple photolithography processes. The wafer undergoes the front-end production process, and the corresponding circuit layout is etched on the wafer, resulting in uneven surface of the wafer. Photoresist coating is performed on uneven wafer surfaces, resulting in uneven thickness of photoresist in each area of ​​the wafer surface

[0004] Among them, the thickness of the photoresist coated on the sidewall area of ​​the groove will be relatively thin. When the thickness is lower than a certain threshold, the remaining photoresist will not be able to resist etching after exposure and development. Define The circuit is damaged, causing the chip not to work properly

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