GaN Wafers to Fabricate LED Devices

GaN Wafers to Fabricate LED Devices

PAM-XIAMEN, one of LED wafer manufacturers, offers GaN Wafer for Fabricating LED Devices, which is GaN Epi Structure with InGaN MQWs on sapphire substrate, and can be blue or green emission:

GaN Wafer for LED

1. Specification of GaN Wafer for LED Devices

No1. PAM200614-GAN-LED

size : 2 inch
WD : 455 ± 10nm
brightness : > 90mcd
VF : < 3.3V
n-GaN Thickness : <4.1㎛
u-GaN thickness : <2.2㎛
substrate : patterned sapphire substrate (PSS)
without p-roughness
without ITO
Single-side polished

Blue LED Structure on Sapphire Wafer Using InGaN/GaN Quantum Well

p-GaN  Mesa Etching Depth: ~10,000A
InGaN MQWs
ESD protection Layer ( -06 μm)
n-GaN (~4 μm)
u-GaN (~2 μm)
Sapphire ( 430 μm)

 

No.2 GaN/AlGaN/AlGaN Stacked Multilayers on Sapphire Substrate (PAM170107-GOS)

Composition Thickness
n-SiGaN
n-AlGaN 30nm
6 periods of GaN
InGaN
p-Mg:GaN
GaN 20nm
c-plane Sapphire

 

No.3 InGaN/GaN Stacked on Sapphire (PAM170107-GOS)

Composition Thickness
p-Mg:GaN
6 periods of GaN 7nm
InGaN
n-Si:GaN 2um
GaN
c-plane sapphire

2. Standard of Gallium Nitride based Epitaxial Layer for LED Lighting

GaN Epitaxial wafers include LED full-structure GaN epitaxial wafers and GaN templates (including n-type and p-type GaN wafers according to conductivity types). Here we just list the criteria of GaN wafer for LED fabrication with the full structure.

2.1 GaN LED Wafer Technical Parameters

The technical parameters of GaN wafer for LED should be complied with the parameters in Table 1.

Table 1

Item Requirements (mm)
50,8 76.2 100 150
Diameter 50.8±0.2 76.2±0.2 100±0.2 150±0.2
Reference Surface Size 16.0±1.0 24.0±1.0 32.0±1.0 48.0±1.0
Center Point Thickness 0.43±0.03 0.52±0.03 0.65±0.03 1.30±0.03
Thickness Unevenness ≤0.02 ≤0.03 ≤0.05 ≤0.08
Curvature ≤0.04 ≤0.05 ≤0.06 ≤0.08
Warpage ≤0.04 ≤0.05 ≤0.06 ≤0.08
Note: When the buyer has special requirements for the geometric dimensions of the epitaxial wafer, it shall be specified in the contract by both the supplier and the buyer.

 

2.2 GaN Wafer Epitaxial Surface Quality

The surface quality of GaN on Sapphire substrate should be meet the requirements in the Table  2.

Table 2

Item Test Conditions Range Requirements
50.8 mm 76.2 mm 100 mm 150 mm
Hexagonal defects 200X diameter ≥300 um 0 pcs/wafer 0 pcs/wafer 0 pcs/wafer 0 pcs/wafer
diameter <300 um 20 pcs/wafer 30 pcs/wafer 40 pcs/wafer 60 pcs/wafer
Fine pits 200X diameter ≥ 20 um 0 pcs/wafer 0 pcs/wafer 0 pcs/wafer 0 pcs/wafer
diameter <20 um 100 pcs/wafer 150 pcs/wafer 200 pcs/wafer 300 pcs/wafer
Small marks   50X length ≥ 5 mm 0 pcs/wafer 0 pcs/wafer 0 pcs/wafer 0 pcs/wafer
length <5 mm 3 pcs/wafer 5 pcs/wafer 10 pcs/wafer 20 pcs/wafer
White point   50X length ≥ 3 mm 0 pcs/wafer 0 pcs/wafer 0 pcs/wafer 0 pcs/wafer
length <3 mm 20 pcs/wafer 30 pcs/wafer 40 pcs/wafer 60 pcs/wafer
Note: When the customer has special requirements for the surface quality of the epitaxial wafer, the supplier and the buyer shall determine in the contract.

 

2.3 Emission wavelength of GaN LED Epi Wafer

The emission wavelength of the full-structure GaN epitaxial wafer is 200nm~430nm for ultraviolet (including violet light), 430nm to 490nm for blue light, and 490nm to 540nm for green light. The typical emission wavelength of the epitaxial wafer of gallium nitride should meet the requirements of Table 3.

Table 3

Item Requirement
UV LED Epitaxial Wafer Blue LED Epitaxial Wafer Green LED Epitaxial Wafer
Typical Wavelength /nm 280±10, 310±10, 380±10 450±10, 470±10 500±10, 520±10
Note: When the buyer has special requirements for the wavelength of the epitaxial wafer or technological advancement changes the existing wavelength, it shall be specified in the contract by the supplier and the buyer.

 

2.4 LED GaN Wafer Photoelectric Parameters

The photoelectric parameters such as the opening voltage (VF), peak wavelength, leakage current, electrostatic discharge sensitivity (ESD) of the GaN epi wafer for LED should meet the requirements of Table 4.

Table 4

Item Requirements
UV LED Epitaxial Wafer Blue LED Epitaxial Wafer Green LED Epitaxial Wafer
Turn on Voltage / V ≤5.0 ≤3.0 ≤3.0
Peak Wavelength / nm 280±10, 310±10, 380±10 450±10, 470±10 500±10, 520±10
Leakage Current(-8V) / uA ≤0.5 ≤1 ≤3
ESD / V ≥4000 ≥4 000 ≥4 000
Note: When the buyer has special requirements for the photoelectric parameters of the GaN epitaxial film or the parameters are changed by technological progress, the supply and buyer shall determine in the contract.

 

3. FAQ about InGaN Epi on Sapphire

Q: Can you also grow InGaN based LEDs on 2-inch sapphire substrates showing light emission of 600nm or longer?
A: For InGaN MQWs,the wavelength should be <=530nm, nobody can offer above 590nm. Unless you accept GaAs-LED structure.

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For more information, please contact us email at [email protected] and [email protected]

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