Patent ID: 8338313
Filing Date: 2012-12-25
Classification: B23K,C30B,H01L

Abstract:
1. A method for non-destructively lifting a III-V semiconductor device from a sapphire substrate, comprising: obtaining a III-V semiconductor layer grown on a sapphire substrate at an interface; irradiating a laser beam through the sapphire substrate, wherein the laser beam forms a laser spot at the interface between the III-V semiconductor layer and the sapphire substrate, wherein the laser spot has a distance between two farthest corners or a longest diameter smaller than 400 μm; and scanning the laser beam across the interface between the III-V semiconductor layer and the sapphire substrate to form a plurality of laser spots at the interface to non-destructively separate the III-V semiconductor layer from the sapphire substrate, wherein the distance between the centers of adjacent laser spots at the interface is in a range of about 30 μm and about 100 μm.