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氮化镓
GaN(氮化镓、Gallium nitride)与硅相比,带隙比硅宽约3倍(3.42eV),绝缘击穿电压也有着约是硅10倍(3.0MV/cm)的特性。和硅相同,将导通电阻下降到10mΩ・cm2时,耐电压达到1600V。
另外,能够产生蓝色和绿色等比较短的波长的光,在各种光器件中也被使用,与SiC一起作为下一代功率半导体器件被寄予期待。
与SiC相比,导热率是SiC这边高出约3倍,除此之外的物性数据(带隙,电子迁移率,击穿电压,饱和漂移速度)都是GaN高出10%左右。
因此,在高温工作环境中,SiC有一定的优势,但是在功率转换容量和工作频率较高的区域中,可以说GaN更有利。
GaN Wafer 规格
GaN 自立基板 Free-Standing GaN Substrates
Grade | Production(A-grade) | Research(B-grade) | Dummy(C-grade) |
Diamater | Φ2inch | ||
Thickness | 350,400±30μm | ||
Surface roughness (Ra) | Ga face:≦0.3nm (Epi-polised) | ||
N face : 0.5-1.5μm , <0.2nm(Option) | |||
Orientation | C-plane(0001) off angle toward M , A-axis | ||
Resistivity(300K) | N-type Undoped:<0.5Ω・cm | ||
N-type Si-doped:<0.05Ω・cm | |||
Semi-insulating Fe-doped:1×106Ω・cm | |||
Usable area | >90% | >80% | >70% |
Dislocation Density | <9.9×105cm-2 | <3×106cm-2 |
GaN Templates
・ GaN on Sapphire(up to 6inch)
・ GaN on Si(up to 8inch)
・ GaN on SiC(up to 6inch)
・ GaN on GaN
Substrate structure | GaN on Sapphire(0001) | |
Diameter(inch) | 2,4,6 | |
Epi layerThickness(μm) | 4.5±0.5 , Customized | |
Conduction Type | N-type(Undoped,Si-doped) P-type(Mg-doped) | |
Resistivity(300K) | <0.5Ω・cm | |
Dislocation Density | < 5×108cm-2 | |
Usable Surface Area | >90% | |
Substrate structure | GaN on Si | |
Diameter(inch) | 4,6,8 | |
Epi layerThickness(μm) | 4.5±0.5 , Customized | |
Surface | RMS:<0.5nm in 5X5μm2 | |
Barrier | AlGaN or AlN or InAlN | |
Cap layer | In-situ SiN or GaN |
AlN Tempates
Substrate structure | AlN on Sapphire , SiC , GaN | |
Diameter(inch) | 2,4,6 | |
Epi layerThickness(nm) | 10~5000(±10%) | |
Orientation | C-plane(0001)±1° | |
Conduction Type | Semi-insulating | |
Dislocation Density | XRD FWHM of (0002) <500arcsec | |
XRD FWHM of (10-12) <1500arcsec | ||
Usable Surface Area | >80% |