Patent ID: 8778746
Filing Date: 2014-07-15
Classification: H01L

Abstract:
1. A thin-film transistor device manufacturing method comprising: providing a substrate; forming a plurality of gate electrodes above the substrate; forming a silicon nitride layer on the plurality of gate electrodes; forming a silicon oxide layer on the silicon nitride layer; forming an amorphous silicon layer on the silicon oxide layer; crystallizing the amorphous silicon layer using laser light emitted from a predetermined laser of at least 473 nm and at most 561 nm in wavelength while moving the predetermined laser in a direction relative to the substrate, to produce a crystalline silicon layer; and forming a source electrode and a drain electrode on the crystalline silicon layer in a region that corresponds to each of the plurality of gate electrodes, wherein a film thickness of the silicon oxide layer, a film thickness of the silicon nitride layer, and a film thickness of the amorphous silicon layer define a value X and a value Y, the value X is obtained by dividing an optical film thickness of the amorphous silicon layer by a wavelength of the laser light, the optical film thickness of the amorphous silicon layer being a product of multiplying the film thickness of the amorphous silicon layer and a refractive index of the amorphous silicon layer, the value Y is obtained by dividing a silicon oxide layer converted optical film thickness by the wavelength of the laser light, the silicon oxide layer converted optical film thickness being obtained by dividing a sum of an optical film thickness of the silicon oxide layer and an optical film thickness of the silicon nitride layer by a refractive index of the silicon oxide layer, the optical film thickness of the silicon oxide layer being a product of multiplying the film thickness of the silicon oxide layer by the refractive index of the silicon oxide layer, the optical film thickness of the silicon nitride layer being a product of multiplying the film thickness of the silicon nitride layer by a refractive index of the silicon nitride layer, and the value X and the value Y satisfy: ΔA′ is calculated according to an expression of: where ρ c d ρ c A