As one of leading SiC epi wafer suppliers, PAM-XIAMEN offers SiC epi wafer, and the SiC epi wafers type includes N type and P type. The SiC epi wafer thickness from 1um to 250um can be produced, and the silicon carbide epi wafer prices are competitive. What is SiC epi wafer? SiC epitaxial wafer is an intermediate link in the core of the SiC industry chain. At present, a whole set of industrial systems from silicon carbide substrates and SiC epi wafers to device preparation have been formed in the world. In the epi wafer market, high-quality SiC epitaxy are the basic materials of SiC power devices. The current development trend of silicon carbide epitaxial materials required by power electronic devices at home and abroad is developing in large diameter, low defects, high uniformity and etc.
1. Specifiche del wafer Epi SiC da 4 pollici
Articolo 1:
PAM201221-SIC-EPI
| SiC substrato | |
| Diametro | 100 millimetri |
| Spessore | 350um |
| Polytype | 4H-SiC |
| Conduttività | Tipo N |
| Off-orientamento verso | 4 gradi fuori asse |
| MPD | ≤1 / cm2 |
| resistività | 0,015 ~ 0,028 ohm-cm |
| Finitura superficiale | Doppio lato lucido |
| Strato Epi | |
| Buffer: | |
| Spessore | 0,5um, tipo n |
| Livello di doping | 1E18cm3 |
| Epi 1: | |
| Spessore | 6um +/- 5% |
| Livello di n-doping | 5.2E15 / cm3 |
Articolo 2:
PAM210514-SIC-EPI
| SiC substrato | |
| Diametro | 100 millimetri |
| Spessore | 350um |
| Polytype | 4H-SiC |
| Conduttività | Tipo N |
| Off-orientamento verso | 4 gradi fuori asse |
| MPD | ≤1 / cm2 |
| resistività | 0,015 ~ 0,028 ohm-cm |
| Finitura superficiale | Doppio lato lucido |
| Strato Epi: | |
| Buffer: | |
| Spessore | 0,5um, tipo n |
| Livello di doping | 1E18cm3 |
| Epi 1: | |
| Spessore | 6um +/- 5% |
| Livello di n-doping | <1E15 / cm3 |
| Elementi a basso tenore di O, B, P e Al: | B <0,06 PPM; P <0,05 PPM; Al <0,01 PPM; senza O |
2. SiC Epi in the Fields of Low Voltage, Medium Voltage and High voltage
In termini di applicazione, generalmente dividiamo il carburo di silicio in tre aree, vale a dire bassa tensione, media tensione e alta tensione. Nel caso della bassa tensione, è principalmente per alcuni dispositivi elettronici di consumo, come PFC e alimentazione; la media tensione è principalmente per l'elettronica automobilistica e la media tensione è anche la principale direzione applicativa per lo sviluppo futuro del wafer SiC epi. Il terzo è il termine dell'applicazione con livelli di tensione relativamente alti, come il transito ferroviario e sistemi di rete elettrica superiori a 3300V.
Allo stesso tempo, possiamo vedere che il carburo di silicio e il nitruro di gallio sono ancora in una relazione competitiva nel campo della media e bassa tensione, ma nel campo dell'alta tensione, dal punto di vista della maturità del materiale, il carburo di silicio ha un vantaggio unico . Tuttavia, è un peccato che fino ad ora non ci sia stato un prodotto maturo nel campo dell'alta tensione. Il wafer epi SiC per il campo ad alta tensione è in fase di ricerca e sviluppo in tutto il mondo, ma nel mercato i wafer epitassiali in carburo di silicio di media e bassa tensione sono già applicati nei diodi e nei prodotti MOSFET.
3. 100mm 4H SiC Epitaxial Wafer Norm
This norm applies to 4H silicon carbide (4H-SiC) epitaxial wafers. The SiC wafer production is mainly used to manufacture power semiconductor devices or power electronic devices.
3.1 Requirements of 4H-SiC Epitaxial Growth in 4 Inch
The substrate is a (0001) silicon surface 4H-SiC wafer with an angle of 4° in the <11-20> direction. The ratio of 4H crystal type to the total area of the silicon carbide wafer should not be less than 90%. The surface of the wafer can be polished on one side or on both sides. The silicon surface of the wafer should be chemically mechanically polished with a surface roughness of less than 0.5 nm. The number of cleanable particles on the surface of the wafer (diameter ≥0.5 um) does not exceed 15/piece.
3.2 Epitaxial Quality Requirements for the SiC wafer
Surface defects of SiC epitaxy should meet the requirements of the following table.
| Voce | Maximum Allowable Limit | |
| Industrial Grade | Research Grade | |
| Carrots | ≤80pcs/wafer | ≤100pcs/wafer |
| Comets | ||
| Triangles | ||
| Downfalls | ||
| Edge Removal | 3 mm | 3 mm |
The surface roughness of SiC wafer in size of 4” should be less than 5.0 nm in the entire 4H-SiC epitaxial wafer range.
The thickness uniformity of the 4-inch SiC epitaxial layer should meet: industrial grade ≤5% and research grade ≤7%
Doping concentration uniformity for industrial grade should be ≤30%, and that for research grade should be ≤35%.
4. FAQ about SiC Epitaxy
Q1: I looked at the SiC homoepitaxial wafers on your company website before, and they all have buffer layer. I would like to ask what is the function of the intermediate buffer layer? What effect will it have on the epitaxial layer if directly epitaxial without a buffer layer?
A: The role of the intermediate buffer layer in SiC homoepitaxy is to reduce defect density and provide epitaxial yield.
Q2: Is there a big difference between the growth temperature of the buffer layer and the epitaxial layer of 4H-SiC epitaxial wafer?
A: There is little difference in growth temperature for buffer and epitaxial layer of 4H-SiC epi wafer.
Q3: I am interested in your standard Instrinsic SiC on 4H SiC substrate.The application is to produce electrochemically suspended membranes of ui doped SiC from a n-type substrate, hopefully of thicknesses between 500nm-2000nm. We are trying to determine the performance of our electrochemical undercut process on Si-face and C-face material. Does high wafer resistivity come from high compensation by deep levels, or from a low concentration of impurities in the epi-layer?
A: If so, I think you need 500nm undoped SiC on n-type SiC substrate. Suggest you use thicker thickness. If you must require 2um, we also can do it, the carrier concentration of undoped SiC should be <1E5, typical ~1E4.
Q4: Is it possible to have 4H-SiC epitaxial on 3C-SiC with 20-40micron thickness?
A: 4H-N SiC on 3C-N SiC is prone to phase transition and is not easy to control. Generally speaking, under epitaxial conditions, it is easier to form 3C crystal forms, so it is difficult to estimate the difficulty of epitaxial 4H on 3C. But we can supply 350um thick freestanding 3C-SiC substrate, more specifications please refer to https://www.powerwaywafer.com/3c-sic-wafer.html.
Per ulteriori informazioni sul wafer epi SiC, fare riferimento a:
150 millimetri 4H n wafer di tipo SiC EPI
Perché abbiamo bisogno del wafer epitassiale in carburo di silicio?
Per ulteriori informazioni, contattaci tramite e-mail all'indirizzo victorchan@powerwaywafer.com e powerwaymaterial@gmail.com.