Patent ID: 8435816
Filing Date: 2013-05-07
Classification: H01L

Abstract:
1. A method for fabricating an InGaAlN light-emitting semiconductor structure, comprising: depositing a first single-crystal sacrificial layer on the surface of a base substrate to form a combined substrate, wherein the first single-crystal sacrificial layer is lattice-matched with InGaAlN, and wherein the first single-crystal sacrificial layer comprises at least one of: GaAs, Ge, AlP, AlAs, GaP, GaSb, InP, InAs, InSb, ZnSe, ZnTe, CdS, CdSe, CdTe, HgSe, HgTePbS, PbSe, PbTe, GaP depositing a second single-crystal sacrificial layer on the first single-crystal sacrificial layer, wherein the base substrate and the first and second single-crystal sacrificial layers form a triple-layer combined substrate; then covering a light-emitting surface of the InGaAlN structure with a passivation layer; and then fabricating metal layers which are situated between the InGaAlN structure and the support substrate, wherein the metal layers comprise a p-side ohmic-contact layer, a light reflective layer, and a diffusion barrier layer; and wherein the p-side ohmic-contact layer comprises a periodical matrix of segregated ohmic-contact pads; wherein transferring the InGaAlN structure comprises etching the first single-crystal sacrificial layer with a chemical etchant; wherein the InGaAlN and the base substrate are resistant to the chemical etchant; and wherein the base substrate can be reused after the InGaAlN structure is transferred.