Patent ID: 9530644
Filing Date: 2016-12-27
CPC Classification: C30B,H01L

Claim Text:
1. A polysilicon manufacturing method that enhances homogeneity of a polysilicon layer, comprising the following steps: (1) forming an amorphous silicon layer on a substrate; (2) dividing the amorphous silicon layer into a plurality of areas and measuring a film thickness of the amorphous silicon layer in each of the areas with a thickness measurement device that comprises a predetermined fixed value of thickness built therein in advance; (3) comparing the measured film thickness of each of the areas with the predetermined fixed value so as to identify and define ones of the areas of which the measured film thicknesses are greater than the predetermined fixed value of thickness as excessive-film-thickness areas, while the remaining ones of the areas have thicknesses that are not greater than the predetermined fixed value of thickness and are defined as non-excessive-film-thickness areas; (4) spraying an etchant liquid directly on the amorphous silicon layer of the excessive-film-thickness areas in the entirety of each of the excessive-film-thickness areas to rinse the amorphous silicon layer of the excessive-film-thickness areas in order to etch off a portion of the amorphous silicon layer of each of the excessive-film-thickness areas and thus remove the portion of the amorphous silicon layer of the excessive film-thickness area and at the same time, spraying pure water to rinse the non-excessive-film-thickness areas in the entirety of each of the non-excessive-film-thickness areas so as to make the film thickness of each of the areas of the amorphous silicon layer consistent with each other and corresponding to the predetermined fixed value; and (5) applying a laser annealing operation to the rinsed amorphous silicon layer so as to cause crystallization of the amorphous silicon layer to form a polysilicon layer.