I am not sure whether practically LLO can be done on the PSS given it is not a flat surface

Q: I am not sure whether practically LLO can be done on the PSS given it is not a flat surface

A: “laser lift-off” actually is according to “NL layer” as below image. If the NL layer is GaN layer, when it is heating to constant high temperature, the GaN is decomposed into Ga and nitrogen, and nitrogen is released out, naturally the sapphire is seperated from epitaxial layer.So the main point is if the NL layer is GaN layer or not (some manufacturers use NL layer by AlN material, if so, it can not be laser lift off.)And we confirm our NL layer is GaN material.

2018-06-19

Q We actually want to check our reflectance (mirror type) measurement method on an LED structure on a PSS wafer. Would it be possible to get the same LED structure on both a PSS wafer and a single-side polished wafer so we can compare the two directly?

Q We actually want to check our reflectance (mirror type) measurement method on an LED structure on a PSS wafer. Would it be possible to get the same LED structure on both a PSS wafer and a single-side polished wafer so we can compare [...]

2018-06-19meta-author

For blue wafer epi on flat substrate, it would be important to omit / leave out the u-GaN layer as we want to LLO and backside conacting. Is that possible?

Q: For blue wafer epi on flat substrate, it would be important to omit / leave out the u-GaN layer as we want to LLO and backside conacting. Is that possible? A:Yes, it is no problem, some clients bought our wafers for LLO.

2018-06-19meta-author

Q:What atomic ratio for Si/C in SiC ?

Q:What atomic ratio for Si/C in SiC ? A:Atomic ratio for Si/C in SiC is 1:1

2018-06-19meta-author

Q:Our application is for microwave annealing. Therefore, the silicon carbide must be able to absorb microwaves?

Q:Our application is for microwave annealing. Therefore, the silicon carbide must be able to absorb microwaves? A:Since the dielectric constant of 6H and 4H are large, so if SiC wafer is as absorbing materials, mainly to achieve through the structure design of Electromagnetic match.I don’t [...]

2018-06-19meta-author

Do these 2” PSS LED wafers have the same epi-stack as the 4” PSS? If not, please send me the diagram with thicknesses. Wavelength can be same: central 455nm

Q:Do these 2” PSS LED wafers have the same epi-stack as the 4” PSS? If not, please send me the diagram with thicknesses. Wavelength can be same: central 455nm A: the 2″ detail layer thickness and structure is same as 4″, no any difference. Wavelength:455nm+/-5nm [...]

2018-06-19meta-author

Q: SiC semiconductor wafer reclaim, can you gurantee surface roughness<=0.3nm?

Q: SiC wafer reclaim, can you gurantee surface roughness<=0.3nm? A: Sure, no problem

2018-06-19meta-author

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I am not sure whether practically LLO can be done on the PSS given it is not a flat surface

I am not sure whether practically LLO can be done on the PSS given it is not a flat surface

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Q We actually want to check our reflectance (mirror type) measurement method on an LED structure on a PSS wafer. Would it be possible to get the same LED structure on both a PSS wafer and a single-side polished wafer so we can compare the two directly?

For blue wafer epi on flat substrate, it would be important to omit / leave out the u-GaN layer as we want to LLO and backside conacting. Is that possible?

Q:What atomic ratio for Si/C in SiC ?

Q:Our application is for microwave annealing. Therefore, the silicon carbide must be able to absorb microwaves?

Do these 2” PSS LED wafers have the same epi-stack as the 4” PSS? If not, please send me the diagram with thicknesses. Wavelength can be same: central 455nm

Q: SiC semiconductor wafer reclaim, can you gurantee surface roughness<=0.3nm?

Float-Zone Mono-Crystalline Silicon

Test Wafer Monitor Wafer Dummy Wafer

Nanofabrication Photoresist

Photo Mask

CdZnTe (CZT) Wafer

Ge(Germanium) Single Crystals and Wafers

Float-Zone Mono-Crystalline Silicon

Test Wafer Monitor Wafer Dummy Wafer

Nanofabrication Photoresist

Photo Mask

CdZnTe (CZT) Wafer

Ge(Germanium) Single Crystals and Wafers