Silicon carbide (SiC) ba wai kawai wani abu ne mai kama da semiconductor ba. Abubuwan da ke tattare da shi na lantarki da zafi sun sa ya zama dole ga na'urorin lantarki na zamani, inverters na EV, na'urorin RF, da aikace-aikacen mitar da yawa. Daga cikin nau'ikan SiC,4H-SiCkuma6H-SiCmamaye kasuwa—amma zaɓar wanda ya dace yana buƙatar fiye da kawai “wanda ya fi arha.”
Wannan labarin yana ba da kwatancen girma-girma da yawa na4H-SiCda kuma substrates 6H-SiC, waɗanda suka shafi tsarin lu'ulu'u, lantarki, yanayin zafi, halayen injiniya, da kuma aikace-aikacen da aka saba amfani da su.
1. Tsarin Crystal da Jerin Tarawa
SiC abu ne mai siffar polymorphic, ma'ana yana iya wanzuwa a cikin tsarin lu'ulu'u da yawa da ake kira polytypes. Jerin jerin layukan Si–C tare da axis na c yana bayyana waɗannan nau'ikan polytypes:
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4H-SiC: Jerin jerin layukan layi huɗu → Daidaito mafi girma tare da axis na c.
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6H-SiC: Jerin jerin layuka shida → Daidaito kaɗan, tsarin band daban.
Wannan bambanci yana shafar motsi na mai ɗaukar kaya, bandgita, da kuma yanayin zafi.
| Fasali | 4H-SiC | 6H-SiC | Bayanan kula |
|---|---|---|---|
| Tarin Layer | ABCB | ABCACB | Yana ƙayyade tsarin madauri da yanayin jigilar kaya |
| Daidaiton lu'ulu'u | Mai siffar hexagon (mafi daidaito) | Mai tsayin ƙafa shida (ɗan tsayi) | Yana shafar ƙaiƙayi, ci gaban epitaxial |
| Girman wafer na yau da kullun | Inci 2–8 | Inci 2–8 | Samuwa yana ƙaruwa don 4H, girma don 6H |
2. Kayayyakin Wutar Lantarki
Babban bambanci mafi muhimmanci yana cikin aikin lantarki. Ga na'urori masu amfani da wutar lantarki da kuma na'urori masu yawan mita,Motsi na electron, bandgap, da juriyamuhimman abubuwan da ke haifar da hakan.
| Kadara | 4H-SiC | 6H-SiC | Tasiri akan Na'ura |
|---|---|---|---|
| Bandgap | 3.26 eV | 3.02 eV | Faɗin bandeji mai faɗi a cikin 4H-SiC yana ba da damar babban ƙarfin lantarki na rushewa, ƙarancin kwararar ruwa |
| Motsi na lantarki | ~1000 cm²/V·s | ~450 cm²/V·s | Sauyawa cikin sauri don na'urorin wutar lantarki masu ƙarfi a cikin 4H-SiC |
| Motsi a rami | ~80 cm²/V·s | ~90 cm²/V·s | Ba shi da mahimmanci ga yawancin na'urorin wutar lantarki |
| Juriya | 10³–10⁶ Ω·cm (mai rufe fuska rabin-ruwa) | 10³–10⁶ Ω·cm (mai rufe fuska rabin-ruwa) | Yana da mahimmanci ga daidaiton girma na epitaxial da RF |
| Dielectric constant | ~10 | ~9.7 | Ƙarami kaɗan a cikin 4H-SiC, yana shafar ƙarfin na'urar |
Muhimman Abubuwan Da Za A Cimma:Ga MOSFET masu ƙarfi, diodes na Schottky, da kuma sauyawa mai sauri, 4H-SiC ya fi dacewa. 6H-SiC ya isa ga na'urorin da ke da ƙarancin ƙarfi ko RF.
3. Halayen Zafi
Rage zafi yana da matuƙar muhimmanci ga na'urori masu ƙarfi. 4H-SiC gabaɗaya yana aiki mafi kyau saboda ƙarfinsa na zafi.
| Kadara | 4H-SiC | 6H-SiC | Ma'anar |
|---|---|---|---|
| Maida wutar lantarki ta thermal | ~3.7 W/cm·K | ~3.0 W/cm·K | 4H-SiC yana wargaza zafi da sauri, yana rage damuwa ta zafi |
| Ma'aunin faɗaɗa zafi (CTE) | 4.2 × 10⁻⁶ /K | 4.1 × 10⁻⁶ /K | Daidaita tare da yadudduka na epitaxial yana da mahimmanci don hana wafer warwarwatsewa |
| Matsakaicin zafin aiki | 600–650 °C | 600°C | Dukansu suna da tsayi, 4H sun fi kyau kaɗan don dogon aiki mai ƙarfi |
4. Kayayyakin Inji
Kwanciyar hankali a injina yana shafar sarrafa wafer, yankewa, da kuma dogaro na dogon lokaci.
| Kadara | 4H-SiC | 6H-SiC | Bayanan kula |
|---|---|---|---|
| Tauri (Mohs) | 9 | 9 | Dukansu suna da matuƙar tauri, na biyu kawai da lu'u-lu'u |
| Taurin karyewa | ~2.5–3 MPa·m½ | ~2.5 MPa·m½ | Mai kama da haka, amma 4H ya ɗan yi kama da juna |
| Kauri wafer | 300–800 µm | 300–800 µm | Wafers masu siriri suna rage juriya ga zafi amma suna ƙara haɗarin sarrafawa |
5. Aikace-aikacen da Aka saba
Fahimtar inda kowace nau'in polytype ta yi fice yana taimakawa wajen zaɓar substrate.
| Nau'in Aikace-aikace | 4H-SiC | 6H-SiC |
|---|---|---|
| MOSFETs masu ƙarfin lantarki mai yawa | ✔ | ✖ |
| Schottky diodes | ✔ | ✖ |
| Injinan lantarki na motocin lantarki | ✔ | ✖ |
| Na'urorin RF / microwave | ✖ | ✔ |
| LEDs da optoelectronics | ✖ | ✔ |
| Ƙananan na'urorin lantarki masu ƙarfin lantarki | ✖ | ✔ |
Dokar Yatsa:
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4H-SiC= Ƙarfi, gudu, inganci
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6H-SiC= RF, ƙarancin wutar lantarki, sarkar samar da kayayyaki masu girma
6. Samuwa da Farashi
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4H-SiC: A tarihi, yana da wahalar girma, yanzu yana ƙara samuwa. Farashi kaɗan amma ya dace da aikace-aikacen da ke da inganci.
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6H-SiC: Samar da kayayyaki masu girma, gabaɗaya yana da ƙarancin farashi, ana amfani da shi sosai don amfani da na'urorin lantarki masu ƙarancin wutar lantarki (RF) da kuma na'urorin lantarki masu ƙarancin wutar lantarki.
Zaɓar Madarar Da Ta Dace
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Babban ƙarfin lantarki, mai saurin lantarki:4H-SiC yana da mahimmanci.
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Na'urorin RF ko LEDs:Sau da yawa 6H-SiC ya isa.
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Aikace-aikace masu sauƙin zafi:4H-SiC yana samar da ingantaccen watsa zafi.
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La'akari da kasafin kuɗi ko wadata:6H-SiC na iya rage farashi ba tare da yin illa ga buƙatun na'ura ba.
Tunani na Ƙarshe
Duk da cewa 4H-SiC da 6H-SiC na iya kama da idon da ba a horar da shi ba, bambance-bambancen su sun shafi tsarin lu'ulu'u, motsin lantarki, ƙarfin lantarki, da kuma dacewa da aikace-aikacen. Zaɓar nau'in polytype daidai a farkon aikin ku yana tabbatar da ingantaccen aiki, rage sake aiki, da na'urori masu aminci.
Lokacin Saƙo: Janairu-04-2026