I-Silicon carbide (i-SiC) ayiseyona nje i-semiconductor esezingeni eliphezulu. Izakhiwo zayo zikagesi nezokushisa ezihlukile ziyenza ibe yinto ebaluleke kakhulu kuma-electronics kagesi esizukulwane esilandelayo, ama-EV inverters, amadivayisi e-RF, kanye nezinhlelo zokusebenza zemvamisa ephezulu. Phakathi kwama-polytype e-SiC,4H-SiCfuthi6H-SiCkubusa imakethe—kodwa ukukhetha efanele kudinga okungaphezu nje kokuthi “okushibhile.”
Lesi sihloko sinikeza ukuqhathanisa okunezinhlangothi eziningi4H-SiCkanye nezingxenye ze-6H-SiC, ezimboza isakhiwo sekristalu, izakhiwo zikagesi, ezishisayo, zemishini, kanye nezinhlelo zokusebenza ezijwayelekile.
1. Isakhiwo sekristalu kanye nokulandelana kwe-stacking
I-SiC iyinto e-polymorphic, okusho ukuthi ingaba khona ezakhiweni eziningi zekristalu ezibizwa ngokuthi ama-polytype. Uchungechunge lokuhlanganisa lwe-Si-C bilayers eceleni kwe-c-axis luchaza la ma-polytype:
-
4H-SiC: Uchungechunge lokuhlanganisa olunezingqimba ezine → Ukulingana okuphezulu ku-c-axis.
-
6H-SiC: Uchungechunge lokuhlanganisa olunezingqimba eziyisithupha → Ukulingana okuphansi kancane, isakhiwo sebhendi esihlukile.
Lo mehluko uthinta ukuhamba kwenkampani, igebe, kanye nokuziphatha kokushisa.
| Isici | 4H-SiC | 6H-SiC | Amanothi |
|---|---|---|---|
| Ukufakwa kwezingqimba | I-ABCB | I-ABCACB | Inquma isakhiwo sebhendi kanye namandla okuthwala |
| Ukulingana kwekristalu | I-Hexagonal (ifana kakhulu) | I-hexagonal (ende kancane) | Kuthinta ukugqwala, ukukhula kwe-epitaxial |
| Usayizi we-wafer ojwayelekile | Amasentimitha angu-2–8 | Amasentimitha angu-2–8 | Ukutholakala kuyanda kumahora angu-4, kuvuthiwe kumahora angu-6 |
2. Izakhiwo Zikagesi
Umehluko obaluleke kakhulu usekusebenzeni kukagesi. Ngamandla namadivayisi asebenzisa imvamisa ephezulu,ukuhamba kwama-electron, igebe, kanye nokumelanayizici ezibalulekile.
| Impahla | 4H-SiC | 6H-SiC | Umthelela Kudivayisi |
|---|---|---|---|
| Igebe | 3.26 eV | 3.02 eV | Igebe elibanzi ku-4H-SiC livumela i-voltage ephezulu yokuqhekeka, kanye nokuvuza okuphansi |
| Ukuhamba kwe-electron | ~1000 cm²/V·s | ~450 cm²/V·s | Ukushintsha okusheshayo kwamadivayisi ane-voltage ephezulu ku-4H-SiC |
| Ukuhamba kwemigodi | ~80 cm²/V·s | ~90 cm²/V·s | Akubalulekile kangako kumadivayisi amaningi kagesi |
| Ukumelana | 10³–10⁶ Ω·cm (evikela kancane) | 10³–10⁶ Ω·cm (evikela kancane) | Kubalulekile ekufaneni kokukhula kwe-RF kanye ne-epitaxial |
| I-dielectric constant | ~10 | ~9.7 | Kuphezulu kancane ku-4H-SiC, kuthinta amandla edivayisi |
Okubalulekile Okufanele Ukwenze:Kuma-MOSFET anamandla, ama-diode e-Schottky, kanye nokushintsha okusheshayo, i-4H-SiC iyathandwa. I-6H-SiC yanele kumadivayisi anamandla aphansi noma e-RF.
3. Izakhiwo Zokushisa
Ukushabalalisa ukushisa kubalulekile kumadivayisi anamandla amakhulu. I-4H-SiC ngokuvamile isebenza kangcono ngenxa yokushisa kwayo.
| Impahla | 4H-SiC | 6H-SiC | Imiphumela |
|---|---|---|---|
| Ukuqhuba kwe-thermal | ~3.7 W/cm·K | ~3.0 W/cm·K | I-4H-SiC isusa ukushisa ngokushesha, inciphise ukucindezeleka kokushisa |
| I-Coefficient of the thermal expansion (CTE) | 4.2 ×10⁻⁶ /K | 4.1 ×10⁻⁶ /K | Ukuhlanganisa izendlalelo ze-epitaxial kubalulekile ukuvimbela ukugoba kwe-wafer |
| Izinga lokushisa eliphezulu lokusebenza | 600–650 °C | 600 °C | Kokubili kuphezulu, i-4H ingcono kancane ekusebenzeni kwamandla aphezulu isikhathi eside |
4. Izakhiwo Zemishini
Ukuzinza kwemishini kuthinta ukuphathwa kwe-wafer, ukuhlukaniswa, kanye nokuthembeka kwesikhathi eside.
| Impahla | 4H-SiC | 6H-SiC | Amanothi |
|---|---|---|---|
| Ubulukhuni (ama-Mohs) | 9 | 9 | Kokubili kunzima kakhulu, kwesibili ngemuva kwedayimane |
| Ukuqina kokuphuka | ~2.5–3 MPa·m½ | ~2.5 MPa·m½ | Kuyafana, kodwa i-4H iyafana kancane |
| Ubukhulu be-wafer | 300–800 µm | 300–800 µm | Ama-wafer amancane anciphisa ukumelana nokushisa kodwa andisa ingozi yokuphatha |
5. Izicelo Ezijwayelekile
Ukuqonda ukuthi uhlobo ngalunye lwe-polytype luphumelela kangakanani kusiza ekukhetheni i-substrate.
| Isigaba Sohlelo Lokusebenza | 4H-SiC | 6H-SiC |
|---|---|---|
| Ama-MOSFET ane-voltage ephezulu | ✔ | ✖ |
| Ama-diode e-Schottky | ✔ | ✖ |
| Ama-inverter ezimoto zikagesi | ✔ | ✖ |
| Amadivayisi e-RF / i-microwave | ✖ | ✔ |
| Ama-LED kanye nama-optoelectronics | ✖ | ✔ |
| Ama-elekthronikhi anamandla aphezulu aphansi | ✖ | ✔ |
Dwebela ushiye isithupha:
-
4H-SiC= Amandla, isivinini, ukusebenza kahle
-
6H-SiC= I-RF, amandla aphansi, uchungechunge lokuphakelwa oluvuthiwe
6. Ukutholakala kanye Nezindleko
-
4H-SiC: Kunzima kakhulu ukukhulisa ngokomlando, manje sekutholakala kakhulu. Izindleko ziphakeme kancane kodwa zifanelekile ngezinhlelo zokusebenza ezisebenza kahle kakhulu.
-
6H-SiC: Ukunikezwa okuvuthiwe, ngokuvamile okuphansi, kusetshenziswa kabanzi kuma-electronics e-RF kanye namandla aphansi.
Ukukhetha i-Substrate Efanele
-
Ama-elekthronikhi anamandla aphezulu, ashesha kakhulu:I-4H-SiC ibalulekile.
-
Amadivayisi e-RF noma ama-LED:I-6H-SiC ivame ukwanele.
-
Izinhlelo zokusebenza ezithinta ukushisa:I-4H-SiC inikeza ukushabalalisa ukushisa okungcono.
-
Isabelomali noma izinto okufanele uzicabangele:I-6H-SiC inganciphisa izindleko ngaphandle kokubeka engcupheni izidingo zedivayisi.
Imicabango Yokugcina
Nakuba i-4H-SiC kanye ne-6H-SiC zingase zibonakale zifana neso elingakaqeqeshwa, umehluko wazo uhlanganisa isakhiwo sekristalu, ukuhamba kwama-electron, ukuqhuba ukushisa, kanye nokufaneleka kokusetshenziswa. Ukukhetha i-polytype efanele ekuqaleni kwephrojekthi yakho kuqinisekisa ukusebenza kahle, ukuncipha kokulungiswa kabusha, kanye namadivayisi athembekile.
Isikhathi sokuthunyelwe: Jan-04-2026