Patent ID: 9218968
Filing Date: 2015-12-22
Classification: H01L

Abstract:
1. A method for forming a crystalline thin film, the method comprising: preparing a substrate; forming a thin film above the substrate; and crystallizing at least a predetermined region in the thin film, by irradiating the thin film with a beam having a predetermined wavelength and scanned relative to the substrate, wherein if (i) the substrate has an end portion intersecting with a first direction and an other end portion intersecting with a second direction which runs perpendicular to the first direction and (ii) the end portion and the other end portion warp toward a light source of the beam, a warpage amount of the end portion is compared with a warpage amount of the other end portion and one of the first direction and the second direction, whichever having a larger warpage amount of the warpage amounts, is identified as a direction of a largest residual stress on the substrate, and in the crystallizing, the beam is scanned in the identified direction of the largest residual stress.