Q: Regarding blue LED epi wafer, after MOCVD, do you anneal the wafer for p-GaN activation?
A:Yes!
Q: Regarding blue LED epi wafer, after MOCVD, do you anneal the wafer for p-GaN activation?
A:Yes!
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 [...]
Q:For pss wafer, the light comes out from the p-GaN side not from sapphire, so I can’t do flipchip packaging. Also I don’t know whether laser liftoff is possible for pss wafer. A:LED light is sourcing from mqw light, emitting in all directions, p-GaN is [...]
Q:For Si-doped GaN, what are the resistivity and mobility? A:Mobility:150-200Resistivity<0.05ohm.cm,
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.
Q:As to the wafer dicing – is it possible to get a non-rectangular dicing? such as 6mm x 8mm size? A:No problem, any size is workable.
Q: Regarding your red LED epiwafers, what about the top layer or cap layer on the epiwafer structure? A: As before we have p+GaAs(several nanometers only) in the top layer, however these two years, due to technology innovation, and all foundry remove this layer [...]
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