Patent ID: 8530900
Filing Date: 2013-09-10
Classification: H01L

Abstract:
1. A thin-film transistor array manufacturing method comprising: preparing a substrate; forming a plurality of gate electrodes above the substrate; forming a gate insulating layer above the gate electrodes; forming an amorphous silicon layer above the gate insulating layer; forming crystalline silicon layer regions by irradiating the amorphous silicon layer in regions above the gate electrodes with a laser beam while relatively moving, in a predetermined direction with respect to the substrate, a laser light source which emits the laser beam having a wavelength from 473 nm to 561 nm so as to crystallize the amorphous silicon layer in the regions above the gate electrodes; and forming source electrodes and drain electrodes above the crystalline silicon layer regions, wherein given that X represents a value obtained by dividing an optical film thickness of the amorphous silicon layer by a wavelength of the laser beam, the optical film thickness of the amorphous silicon layer being a value obtained by multiplying a thickness of the amorphous silicon layer formed in the forming the amorphous silicon layer and a refractive index of the amorphous silicon layer, and Y represents a value obtained by dividing an optical film thickness of the gate insulating layer by the wavelength of the laser beam, the optical film thickness of the gate insulating layer being a value obtained by multiplying a thickness of the gate insulating layer formed in the forming the gate insulating layer and a refractive index of the gate insulating layer, X and Y are values satisfying a range determined by Expressions 1 to 5, and given that x represents absorptance (%) of the laser beam by the amorphous silicon layer formed in the forming the amorphous silicon layer, and y represents a relative value with respect to an energy density of the laser beam, which is defined as 1, necessary for crystallizing the amorphous silicon layer so as to form the crystalline silicon layer regions when the absorptance, for the laser beam, of the amorphous silicon layer formed in the forming the amorphous silicon layer is 23.2(%), and x and y are value satisfying a range determined by Expressions 6, 7, and 8,