Patent ID: 7816196
Filing Date: 2010-10-19
Classification: B23K,H01L

Abstract:
1. A laser crystallization method, comprising the steps of: providing a substrate on which an amorphous silicon thin film is deposited; positioning a laser mask over the substrate, the laser mask including a mask pattern that contains transmitting regions and a blocking region, wherein the mask pattern has edges having concave shapes inverted in consideration of diffraction of the laser mask to reduce overlap regions of crystallized silicon thin film, and wherein the transmitting regions of a slit pattern align such that two of the transmitting regions are formed on a left side of the laser mask and one of the transmitting regions is formed on a right side of the laser mask to offset each other; irradiating a first laser beam onto a surface of the substrate through the pattern of the laser mask to first crystallize a predetermined region of the silicon thin film; moving the laser mask or a stage on which the substrate is loaded in an X-axis direction to perform second crystallization using the laser mask; repeatedly performing the crystallization to an end of the substrate in the X-axis direction; moving the laser mask or the stage in a Y-axis direction; and repeatedly performing the crystallization in the Y-axis direction to complete crystallization.