ʻAʻole ʻo Silicon carbide (SiC) he semiconductor niche wale nō. ʻO kona mau waiwai uila a me ka wela kūikawā e lilo ia i mea pono no nā uila mana hanauna hou, nā inverters EV, nā mea RF, a me nā noi alapine kiʻekiʻe. Ma waena o nā polytypes SiC,4H-SiCa me6H-SiCe noho aliʻi ma ka mākeke—akā, ʻo ke koho ʻana i ka mea kūpono e pono ai ma mua o ka "ʻoi aku ka makepono."
Hāʻawi kēia ʻatikala i kahi hoʻohālikelike multidimensional o4H-SiCa me nā substrates 6H-SiC, e uhi ana i ka ʻano kristal, uila, thermal, nā waiwai mechanical, a me nā noi maʻamau.
1. ʻAno Crystal a me ke Kaʻina Stacking
He mea polymorphic ʻo SiC, ʻo ia hoʻi hiki ke noho i loko o nā ʻano kristal he nui i kapa ʻia he polytypes. ʻO ke kaʻina stacking o nā bilayers Si-C ma ke axis c e wehewehe ana i kēia mau polytypes:
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4H-SiC: Kaʻina hoʻonohonoho ʻehā papa → Symmetry kiʻekiʻe ma ke axis-c.
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6H-SiC: Kaʻina hoʻonohonoho ʻeono papa → ʻAno like haʻahaʻa iki, ʻokoʻa ke ʻano o ke kāʻei.
Hoʻopilikia kēia ʻokoʻa i ka neʻe ʻana o ka mea lawe, ka bandgap, a me ke ʻano wela.
| Hiʻona | 4H-SiC | 6H-SiC | Nā memo |
|---|---|---|---|
| Hoʻomoe papa | ʻABC | ʻABCACB | Hoʻoholo i ka hoʻonohonoho ʻana o ke kāʻei a me nā dinamika lawe |
| ʻO ke kaulike kristal | Hexagonal (ʻoi aku ka like) | Hexagonal (ua hoʻolōʻihi iki ʻia) | Hoʻopilikia i ke kahakaha ʻana, ka ulu ʻana o ka epitaxial |
| Nā nui wafer maʻamau | 2–8 ʻīniha | 2–8 ʻīniha | Ke piʻi nei ka loaʻa no 4H, oʻo no 6H |
2. Nā Waiwai Uila
ʻO ka ʻokoʻa koʻikoʻi loa aia i ka hana uila. No nā mea mana a me nā alapine kiʻekiʻe,ka neʻe ʻana o ka electron, ka bandgap, a me ka resistivityhe mau kumu koʻikoʻi.
| Waiwai | 4H-SiC | 6H-SiC | Hopena ma ka hāmeʻa |
|---|---|---|---|
| Pākuʻi | 3.26 eV | 3.02 eV | ʻO ka bandgap ākea ma 4H-SiC e ʻae i ka volta breakdown kiʻekiʻe, ka leakage current haʻahaʻa |
| Ka neʻe ʻana o nā uila | ~1000 kenimika²/V·s | ~450 kenimika²/V·s | Ka hoʻololi wikiwiki ʻana no nā mea uila kiʻekiʻe ma 4H-SiC |
| Ka neʻe ʻana o ka lua | ~80 kenimika²/V·s | ~90 kenimika²/V·s | ʻAʻole koʻikoʻi loa no ka hapa nui o nā hāmeʻa mana |
| Ke kū'ē ʻana | 10³–10⁶ Ω·cm (hapa-pale) | 10³–10⁶ Ω·cm (hapa-pale) | He mea nui no ka RF a me ke kūlike o ka ulu ʻana o ka epitaxial |
| Paʻa mau o ka dielectric | ~10 | ~9.7 | ʻOi aku ka kiʻekiʻe ma 4H-SiC, hoʻopilikia i ka capacitance o ka hāmeʻa |
Nā Manaʻo Koʻikoʻi:No nā MOSFET mana, nā diode Schottky, a me ka hoʻololi wikiwiki, makemake ʻia ʻo 4H-SiC. Ua lawa ka 6H-SiC no nā mea mana haʻahaʻa a i ʻole nā mea RF.
3. Nā Waiwai Wela
He mea koʻikoʻi ka hoʻopuehu ʻana o ka wela no nā hāmeʻa mana kiʻekiʻe. Hana maikaʻi ka 4H-SiC ma muli o kona conductivity thermal.
| Waiwai | 4H-SiC | 6H-SiC | Nā hopena |
|---|---|---|---|
| Ka hoʻokele wela | ~3.7 W/cm·K | ~3.0 W/cm·K | Hoʻopau wikiwiki ʻo 4H-SiC i ka wela, e hōʻemi ana i ke kaumaha wela |
| Ka helu o ka hoʻonui wela (CTE) | 4.2 ×10⁻⁶ /K | 4.1 ×10⁻⁶ /K | He mea nui ka hoʻohālikelike ʻana me nā papa epitaxial e pale aku i ka wafer warping |
| Ka mahana hana kiʻekiʻe loa | 600–650 °C | 600°C | ʻOi aku ka maikaʻi o nā mea ʻelua, ʻoi aku ka maikaʻi o 4H no ka hana mana kiʻekiʻe lōʻihi |
4. Nā Waiwai Mekanika
Hoʻopilikia ke kūpaʻa mechanical i ka lawelawe ʻana i ka wafer, ka ʻoki ʻana, a me ka hilinaʻi lōʻihi.
| Waiwai | 4H-SiC | 6H-SiC | Nā memo |
|---|---|---|---|
| Paʻakikī (Mohs) | 9 | 9 | Paʻakikī loa nā mea ʻelua, ʻo ka lua wale nō ia ma hope o ke daimana |
| Paʻakikī o ka haki | ~2.5–3 MPa·m½ | ~2.5 MPa·m½ | Ua like, akā ʻoi aku ka like o 4H |
| Mānoanoa o ka wafer | 300–800 µm | 300–800 µm | Hoʻemi nā wafers lahilahi i ke kūpaʻa wela akā hoʻonui i ka pilikia lawelawe |
5. Nā noi maʻamau
ʻO ka hoʻomaopopo ʻana i kahi e ʻoi aku ai kēlā me kēia polytype e kōkua i ke koho ʻana i ka substrate.
| Māhele Noi | 4H-SiC | 6H-SiC |
|---|---|---|
| Nā MOSFET uila kiʻekiʻe | ✔ | ✖ |
| Nā diode Schottky | ✔ | ✖ |
| Nā mea hoʻololi kaʻa uila | ✔ | ✖ |
| Nā mea hana RF / microwave | ✖ | ✔ |
| Nā LED a me nā optoelectronics | ✖ | ✔ |
| Nā mea uila uila kiʻekiʻe mana haʻahaʻa | ✖ | ✔ |
Rula o ka Manamana Nui:
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4H-SiC= Mana, wikiwiki, pono
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6H-SiC= RF, mana haʻahaʻa, kaulahao lako oʻo
6. Loaʻa a me ke kumukūʻai
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4H-SiCʻOi aku ka paʻakikī o ka ulu ʻana ma mua o ka wā ma mua, akā i kēia manawa ua nui ka loaʻa ʻana. ʻOi aku ke kiʻekiʻe o ke kumukūʻai akā ua kūpono no nā noi hana kiʻekiʻe.
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6H-SiCʻO ka lako makua, ʻoi aku ka haʻahaʻa o ke kumukūʻai, hoʻohana nui ʻia no ka RF a me nā mea uila mana haʻahaʻa.
Ke koho ʻana i ka substrate kūpono
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Nā mea uila mana wikiwiki kiʻekiʻe:He mea nui ka 4H-SiC.
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Nā mea hana RF a i ʻole nā LED:ʻO ka pinepine, ua lawa ka 6H-SiC.
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Nā noi pili wela:Hāʻawi ʻo 4H-SiC i ka hoʻopuehu wela maikaʻi aʻe.
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Nā noʻonoʻo kālā a i ʻole nā lako:Hiki i ka 6H-SiC ke hōʻemi i ke kumukūʻai me ka ʻole o ka hoʻopilikia ʻana i nā koi o ka hāmeʻa.
Nā Manaʻo Hope Loa
ʻOiai paha e like ke ʻano o 4H-SiC a me 6H-SiC me ka maka i aʻo ʻole ʻia, ʻo ko lākou ʻokoʻa e pili ana i ke ʻano kristal, ka neʻe ʻana o ka electron, ka conductivity thermal, a me ke kūpono o ka noi. ʻO ke koho ʻana i ka polytype kūpono i ka hoʻomaka ʻana o kāu papahana e hōʻoiaʻiʻo ana i ka hana kūpono, ka hoʻemi ʻana i ka hana hou ʻana, a me nā mea hana hilinaʻi.
Ka manawa hoʻouna: Ian-04-2026