Patent ID: 6159777
Filing Date: 2000-12-12
Classification: B23K,H01L,Y10S

Abstract:
A method of manufacturing a semiconductor device comprising:forming a semiconductor layer over a substrate;crystallizing said semiconductor layer;patterning the crystallized semiconductor layer to form a semiconductor island; andintroducing an impurity into at least a portion of said semiconductor island to form source and drain regions,wherein the crystallization is performed by a method comprising the steps of:emitting a laser beam having a cross section from a laser device, said laser beam having a length and a width;modifying an energy distribution of said laser beam in a widthwise direction of a cross section by using a lateral flyeye lens;modifying an energy distribution of said laser beam in a lengthwise direction of a cross section by using a vertical flyeye lens;condensing the laser beam after passing through said lateral flyeye lens in only the widthwise direction by using a first cylindrical convex lens;condensing the laser beam after passing through said vertical flyeye lens in only the lengthwise direction by using a second cylindrical convex lens;condensing the laser beam after passing through said first and second cylindrical convex lenses only in the widthwise direction by using a third cylindrical convex lens;irradiating the laser beam after passing through first, second and third cylindrical convex lenses on said semiconductor layer; andmoving said substrate along said widthwise direction so that said semiconductor layer is irradiated with the laser beam,wherein said third cylindrical convex lens is located distant from said first cylindrical convex lens by a distance larger than focal length of said first cylindrical convex lens.