I-silicon carbide (i-SiC) ayiseyiyo nje i-semiconductor ekhethekileyo. Iipropati zayo ezibalaseleyo zombane kunye nobushushu zenza ukuba ibaluleke kakhulu kwizixhobo zombane zesizukulwana esilandelayo, ii-EV inverters, izixhobo ze-RF, kunye nokusetyenziswa kwe-high-frequency. Phakathi kwee-polytypes ze-SiC,4H-SiCkwaye6H-SiCzilawula imarike—kodwa ukukhetha eyona ifanelekileyo kufuna okungaphezulu nje “kwento engabizi kakhulu.”
Eli nqaku libonelela ngothelekiso olunemilinganiselo emininzi4H-SiCkunye ne-6H-SiC substrates, ezigubungela isakhiwo sekristale, umbane, ubushushu, iimpawu zoomatshini, kunye nokusetyenziswa okuqhelekileyo.
1. Ulwakhiwo lwekristale kunye nolandelelwano lwe-Stacking
I-SiC yinto enemibala eyahlukeneyo, oko kuthetha ukuba inokubakho kwizakhiwo ezininzi zekristale ezibizwa ngokuba zii-polytypes. Ulandelelwano lokudibanisa ii-bilayers ze-Si–C ecaleni kwe-c-axis luchaza ezi polytypes:
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4H-SiC: Ulandelelwano lokudibanisa oluneeleya ezine → Ulungelelwaniso oluphezulu kwi-c-axis.
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6H-SiC: Ulandelelwano lokudibanisa oluneeleya ezintandathu → Ulungelelwaniso oluphantsi kancinci, ulwakhiwo lwebhendi olwahlukileyo.
Lo mahluko uchaphazela ukuhambahamba komthwali, i-bandgap, kunye nokuziphatha kobushushu.
| Uphawu | 4H-SiC | 6H-SiC | Amanqaku |
|---|---|---|---|
| Ukubeka iileya | I-ABCB | I-ABCACB | Ichonga ulwakhiwo lwebhendi kunye ne-carrier dynamics |
| Ulungelelwaniso lwekristale | I-Hexagonal (ifanayo ngakumbi) | I-Hexagonal (ende kancinci) | Ichaphazela ukugrumba, ukukhula kwe-epitaxial |
| Ubungakanani obuqhelekileyo be-wafer | 2–8 intshi | 2–8 intshi | Ukufumaneka kuyakhula kwi-4H, kuvuthiwe kwi-6H |
2. Iipropati zoMbane
Umahluko obaluleke kakhulu usekwe ekusebenzeni kombane. Kwizixhobo zamandla kunye nezixhobo ezisebenzisa amaza aphezulu,ukuhamba kwe-electron, i-bandgap, kunye ne-resistivityzizinto eziphambili.
| Ipropati | 4H-SiC | 6H-SiC | Impembelelo kwiSixhobo |
|---|---|---|---|
| I-Bandgap | 3.26 eV | 3.02 eV | I-bandgap ebanzi kwi-4H-SiC ivumela i-voltage ephezulu yokuqhekeka, kunye nomsinga wokuvuza ophantsi |
| Ukuhambahamba kwee-electron | ~1000 cm²/V·s | ~450 cm²/V·s | Ukutshintsha ngokukhawuleza kwezixhobo ezine-voltage ephezulu kwi-4H-SiC |
| Ukuhambahamba kwemingxunya | ~80 cm²/V·s | ~90 cm²/V·s | Ayibalulekanga kangako kwizixhobo ezininzi zamandla |
| Ukuxhathisa | 10³–10⁶ Ω·cm (engagqumiyo kakhulu) | 10³–10⁶ Ω·cm (engagqumiyo kakhulu) | Kubalulekile kwi-RF kunye ne-epitaxial growth equivalent |
| I-Dielectric constant | ~10 | ~9.7 | Iphezulu kancinci kwi-4H-SiC, ichaphazela amandla esixhobo |
Into ebalulekileyo ekufuneka uyithathe:Kwi-MOSFETs ezinamandla, ii-diode zeSchottky, kunye nokutshintsha ngesantya esiphezulu, i-4H-SiC iyathandwa. I-6H-SiC yanele kwizixhobo ezinamandla aphantsi okanye zeRF.
3. Iipropati zobushushu
Ukusasazwa kobushushu kubalulekile kwizixhobo ezinamandla aphezulu. I-4H-SiC ngokubanzi isebenza ngcono ngenxa yokuqhuba kwayo ubushushu.
| Ipropati | 4H-SiC | 6H-SiC | Iziphumo |
|---|---|---|---|
| Ukuqhuba kobushushu | ~3.7 W/cm·K | ~3.0 W/cm·K | I-4H-SiC isusa ubushushu ngokukhawuleza, inciphisa uxinzelelo lobushushu |
| I-Coefficient of thermal expansion (CTE) | 4.2 ×10⁻⁶ /K | 4.1 ×10⁻⁶ /K | Ukudibanisa nee-epitaxial layers kubalulekile ukuthintela ukugoba kwe-wafer |
| Ubushushu obuphezulu bokusebenza | 600–650 °C | 600 °C | Zombini ziphezulu, i-4H ingcono kancinci ekusebenzeni ngamandla aphezulu ixesha elide |
4. Iipropati zoomatshini
Uzinzo loomatshini luchaphazela ukuphathwa kwe-wafer, ukugawula, kunye nokuthembeka kwexesha elide.
| Ipropati | 4H-SiC | 6H-SiC | Amanqaku |
|---|---|---|---|
| Ubunzima (iiMohs) | 9 | 9 | Zombini zinzima kakhulu, zilandela idayimani kuphela |
| Ukuqina kokwaphuka | ~2.5–3 MPa·m½ | ~2.5 MPa·m½ | Iyafana, kodwa i-4H ifana kancinci |
| Ubukhulu be-wafer | 300–800 µm | 300–800 µm | Iiwafer ezincinci zinciphisa ukumelana nobushushu kodwa zonyusa umngcipheko wokuphatha |
5. Izicelo eziqhelekileyo
Ukuqonda apho i-polytype nganye igqwesa khona kuyanceda ekukhetheni i-substrate.
| Udidi lweSicelo | 4H-SiC | 6H-SiC |
|---|---|---|
| IiMOSFET ezine-voltage ephezulu | ✔ | ✖ |
| Iidiode zeSchottky | ✔ | ✖ |
| Ii-inverters zezithuthi zombane | ✔ | ✖ |
| Izixhobo zeRF / i-microwave | ✖ | ✔ |
| Ii-LED kunye ne-optoelectronics | ✖ | ✔ |
| Izixhobo ze-elektroniki ezinamandla aphantsi ezinamandla aphezulu | ✖ | ✔ |
Umgaqo kabhontsi:
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4H-SiC= Amandla, isantya, ukusebenza kakuhle
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6H-SiC= I-RF, amandla aphantsi, uthotho lobonelelo oluvuthiweyo
6. Ukufumaneka kunye nexabiso
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4H-SiC: Bekunzima kakhulu ukukhula, ngoku kufumaneka ngakumbi. Ixabiso liphezulu kancinci kodwa lifanelekile kwizicelo ezisebenza kakuhle.
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6H-SiC: Ubonelelo oluvuthiweyo, ngexabiso eliphantsi ngokubanzi, lusetyenziswa kakhulu kwi-RF kunye ne-elektroniki enamandla aphantsi.
Ukukhetha i-substrate efanelekileyo
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Izixhobo ze-elektroniki ezinamandla aphezulu, ezikhawulezayo:I-4H-SiC ibalulekile.
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Izixhobo zeRF okanye ii-LED:I-6H-SiC idla ngokwanela.
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Izicelo ezichaphazela ubushushu:I-4H-SiC ibonelela ngokusasazwa kobushushu okungcono.
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Izinto ekufuneka ziqwalaselwe kuhlahlo-lwabiwo mali okanye ukubonelela ngeenkonzo:I-6H-SiC inokunciphisa iindleko ngaphandle kokubeka emngciphekweni iimfuno zesixhobo.
Iingcinga Zokugqibela
Nangona i-4H-SiC kunye ne-6H-SiC zinokubonakala zifana neliso elingaqeqeshwanga, umahluko wazo ubandakanya ulwakhiwo lwekristale, ukuhamba kwe-electron, ukuqhuba kobushushu, kunye nokufaneleka kokusetyenziswa. Ukukhetha i-polytype echanekileyo ekuqaleni kweprojekthi yakho kuqinisekisa ukusebenza kakuhle, ukuhlaziywa okunciphileyo, kunye nezixhobo ezinokuthenjwa.
Ixesha leposi: Jan-04-2026