Patent ID: 7892873
Filing Date: 2011-02-22
Classification: H01L

Abstract:
1. A fabrication method of a nitride-based semiconductor device including a structure in which a retention substrate and a stacked structure constituted of a nitride-based semiconductor are united with a bonding metal therebetween, said fabrication method comprising: forming said stacked structure constituted of said nitride-based semiconductor on a support substrate, depositing a first bonding metal on said stacked structure, depositing a second bonding metal on said retention substrate, bonding said first bonding metal to said second bonding metal in a state where said first bonding metal and said second bonding metal face each other to unite said retention substrate and said stacked structure, said first bonding metal and said second bonding metal constituting said bonding metal, separating said support substrate from said stacked structure for removal, and forming a groove in said stacked structure for chip division after separating said support substrate from said stacked structure, wherein a continuous surface area, before forming the groove for chip division, of the entire surface of said retention substrate disposed on a side of the second bonding metal is smaller than a continuous surface area, before forming the groove for chip division, of the entire surface of said support substrate disposed on a side of the stacked structure, and wherein a difference between a span of the support substrate and a span of the retention substrate is greater than a sum of a layer thickness of said first bonding metal and a layer thickness of said second bonding metal.