Patent ID: 7635412
Filing Date: 2009-12-22
Classification: B23K,H01L

Abstract:
1. A method for crystallizing silicon comprising: positioning a substrate having an amorphous silicon layer on a stage; arranging a mask over the substrate, the mask including a first region having a plurality of open parts substantially oriented along the X-axis direction, and a second region having a plurality of open parts substantially oriented along the Y-axis direction, wherein the respective first and second regions of the mask have the open and closed parts having the same width; blocking the second region of the mask and transmitting a laser beam through the mask to form a first crystallizing block in the amorphous silicon layer while moving one of the stage and the mask along the X-axis direction, wherein the first crystallizing block corresponds to a portion where one laser pulse passing through the first region of the mask is irradiated onto the amorphous silicon layer, wherein the crystallization process for the X-axis direction includes: crystallizing the amorphous silicon layer when the first region of the mask is opened, and the stage is moved along the X-axis direction a distance corresponding to the length of one part in the first crystallizing block; moving the stage along the Y-axis direction a distance corresponding to the width of one part in the first crystallizing block after completing the movement of the stage in the X-axis direction; crystallizing the amorphous silicon layer when the first region of the mask is opened, and the stage is moved along the X-axis direction in the opposite direction a distance corresponding to the length of one part in the first crystallizing block; and moving the stage along the Y-axis direction a distance corresponding to the width of the first crystallizing block after completing the movement of the stage in the X-axis direction of the substrate, wherein the crystallization progress for the X-axis direction is repeatedly carried out; and blocking the first region of the mask and transmitting a laser beam through the mask to form a second crystallizing block in the amorphous silicon layer while moving one of the stage and the mask along the Y-axis direction, wherein the second crystallizing block corresponds to a portion where one laser pulse passing through the second region of the mask is irradiated onto the amorphous silicon layer, wherein the crystallization process for the Y-axis direction includes: crystallizing the amorphous silicon layer when the second region of the mask is opened, and the stage is moved along the Y-axis direction a distance corresponding to the length of one part in the second crystallizing block; moving the stage along the X-axis direction a distance corresponding to the width of one part in the second crystallizing block after completing the movement of the stage in the Y-axis direction; crystallizing the amorphous silicon layer when the second region of the mask is opened, and the stage is moved along the Y-axis direction in the opposite direction a distance corresponding to the length of one part in the second crystallizing block; and moving the stage along the X-axis direction a distance corresponding to the width of the second crystallizing block after completing the movement of the stage in the Y-axis direction of the substrate, wherein the crystallization process for the Y-axis direction is repeatedly carried out.