Patent ID: 8435816

Claim:
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 x As 1-x , Ga x Al 1-x As, MgAl 2 O 4 , LiGaO 2 , γ-LiAlO 2 , NdGaO 3 , ScAlMgO 4 , Ga 8 La 2 (PO 4 ) 6 O 2 , MoS 2 , LaAlO 3 , (Mn, Zn)Fe 2 O 4 , Hf, Zr, ZrN, Sc, ScN, NbN, and TiN; then 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 epitaxially fabricating the InGaAlN light-emitting semiconductor structure on the combined substrate; transferring the InGaAlN structure fabricated on the combined substrate to a support substrate, thereby facilitating a vertical electrode configuration; 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.