Patent ID: 7955959

Claim:
A method for manufacturing GaN-based film LED based on masklessly transferring photonic crystal structure, comprising the followings steps: depositing a SiO2 mask layer onto a sapphire substrate; photoetching and fabricating periodically distributed circular holes on the SiO2 mask layer, exposing the sapphire substrate at the area of circular holes to form two dimensional photonic crystals on the sapphire substrate; growing undoped GaN material layer and GaN-based epitaxy in sequence on the sapphire substrate having said two dimensional photonic crystals using MOCVD process, the GaN-based epitaxy having a N type GaN-based semiconductor layer, an active layer and a P type GaN-based semiconductor layer; depositing a P type Ohmic contact and reflective metal layer on a surface of the P type GaN-based semiconductor layer; depositing welding metal including Au and Au alloy on the P type Ohmic contact and reflective metal layer; bonding the GaN-based epitaxy onto a heat sink substrate by the welding metal; removing the sapphire substrate to expose the interface at which the SiO2 mask layer and the undoped GaN material layer coexist; etching the undoped GaN material layer and SiO2 mask layer of the exposed area simultaneously by dry etching process to expose the N type GaN-based semiconductor layer, and masklessly forming periodically distributed circular holes by using different etching rates between the GaN material and the SiO2 mask to expose the N type GaN-based semiconductor at the area of circular holes, thereby forming two dimensional photonic crystals on the N type GaN-based semiconductor layer, wherein the projecting portions between the circular holes are undoped GaN material layer; depositing a N type Ohmic contact electrode at central area of a surface having the two dimensional photonic crystal structure; depositing a P type electrode at the back face of the heat sink substrate; and forming GaN vertical LED chips in a process of slicing or cutting off.