Sidee loo doortaa, loo isticmaalaa oo loo dayactiraa doon PECVD ah?

1. Waa maxay doon PECVD ah?

1.1 Qeexidda iyo hawlaha asaasiga ah

Doonta PECVD (Plasma Enhanced Chemical Vapor Deposition) waa qalab asaasi ah oo loo isticmaalo in lagu qaado wafers ama substrate-ka habka PECVD. Waxay u baahan tahay inay si joogto ah ugu shaqeyso jawi heerkul sare (300-600°C), gaas plasma-ku-shaqeysiiya iyo gaas daxalaysan (sida SiH₄, NH₃). Shaqooyinkeeda ugu muhiimsan waxaa ka mid ah:

● Meelaynta saxda ah: hubi kala fogaanshaha wafer-ka oo isku mid ah oo iska ilaali faragelinta dahaarka.
● Xakamaynta goobta kulaylka: hagaaji qaybinta heerkulka oo hagaaji isku mid ahaanshaha filimka.
● Caqabadda ka hortagga wasakhowga: Waxay ka soocdaa balaasmaha godka qalabka si loo yareeyo khatarta wasakhowga birta.

1.2 Qaab-dhismeedka caadiga ah iyo agabka

Xulashada agabka:

● Doonta Graphite (doorashada caadiga ah): kuleyl badan oo la qaadi karo, iska caabin heerkul sare leh, kharash yar, laakiin waxay u baahan tahay dahaar si looga hortago miridhku.
●Doon Quartz ah: Nadiifnimo aad u sarreysa, kiimiko ahaan u adkaysta, laakiin aad u jaban oo qaali ah.
●Dhoobada (sida Al₂O₃): Waxay u adkaystaa xirashada, waxayna ku habboon tahay wax soo saarka soo noqnoqda badan, laakiin waxay u adkaysataa kulaylka.

Astaamaha ugu muhiimsan ee naqshadaynta:

● Kala fogaanshaha booska: Dhumucda wafer-ka isku midka ah (sida dulqaadka 0.3-1mm).
●Naqshadeynta godka socodka hawada: hagaaji qaybinta gaaska falcelinta iyo yaraynta saameynta geeska.
●Dahaarka dusha sare: Dahaarka Caadiga ah ee SiC, TaC ama DLC (kaarboon u eg dheeman) si loo dheereeyo cimriga adeegga.

2. Maxaan fiiro gaar ah u siineynaa waxqabadka doomaha PECVD?

2.1 Afar arrimood oo waaweyn oo si toos ah u saameeya wax-soo-saarka geeddi-socodka

✔ Xakamaynta Wasakhowga:
Wasakhda ku jirta jirka doonta (sida Fe iyo Na) way qallalaan heerkul sare, taasoo keenta godad ama daadasho filimka.
Diirka dahaarka ayaa keeni doona walxo waxayna sababi doonaan cillado dahaarka ah (tusaale ahaan, walxaha ka badan 0.3μm waxay sababi karaan in hufnaanta batteriga ay hoos u dhacdo 0.5%).

✔ Isku mid ahaanshaha goobta kulaylka:
Kuleylka aan sinnayn ee doonida garaafka PECVD waxay horseedi doontaa kala duwanaansho dhumucda filimka (tusaale ahaan, shuruudaha isku midka ah ee ±5%, farqiga heerkulka waa inuu ka yar yahay 10°C).

✔ Waafaqsanaanta Plasma:
Alaabada aan habboonayn waxay sababi karaan dheecaan aan caadi ahayn waxayna dhaawici karaan wafer-ka ama elektroodhada qalabka.

✔ Cimriga adeegga iyo kharashka:
Qolalka doonyaha ee tayada hooseeya waxay u baahan yihiin in si joogto ah loo beddelo (tusaale ahaan bishiiba mar), kharashyada dayactirka sanadlaha ahna waa qaali.

3. Sidee loo doortaa, loo isticmaalaa oo loo ilaaliyaa doon PECVD ah?

3.1 Habka xulashada saddexda tallaabo

Tallaabada 1: Caddee xuduudaha habka

● Heerkulka kala duwan: Dahaarka Graphite + SiC waxaa laga dooran karaa meel ka hooseysa 450°C, quartz ama dhoobadana waxaa loo baahan yahay meel ka sarreysa 600°C.
●Nooca Gaaska: Marka ay ku jiraan gaasaska sunta ah sida Cl2 iyo F-, waa in la isticmaalaa dahaadh cufnaan sare leh.
●Cabbirka Wafer: Xoogga qaab-dhismeedka doonida ee 8-inch/12-inch aad ayuu uga duwan yahay wuxuuna u baahan yahay naqshad bartilmaameedsan.

Tallaabada 2: Qiimee halbeegyada waxqabadka

Halbeegyada Muhiimka ah:

●Qalafsanaanta dusha sare (Ra): ≤0.8μm (dusha taabashada waa inay ahaataa ≤0.4μm)
●Xoogga xidhmada dahaarka: ≥15MPa (ASTM C633 standard)
●Isbeddelka heerkulka sare (600℃): ≤0.1mm/m (tijaabo 24 saacadood ah)

Tallaabada 3: Xaqiiji iswaafajinta

● Iswaafajinta qalabka: Xaqiiji cabbirka is-dhexgalka iyadoo la adeegsanayo moodooyinka caadiga ah sida AMAT Centura, centrotherm PECVD, iwm.
● Tijaabada wax soo saarka tijaabada ah: Waxaa lagu talinayaa in la sameeyo tijaabo dufcad yar oo ah 50-100 xabbo si loo xaqiijiyo isku mid ahaanshaha dahaarka (kala duwanaanshaha caadiga ah ee dhumucda filimka <3%).

3.2 Hababka ugu Fiican ee Isticmaalka iyo Dayactirka

Tilmaamaha Hawlgalka:

✔Habka nadiifinta kahor:

● Kahor isticmaalka ugu horreeya, Xinzhou wuxuu u baahan yahay in lagu shubo balaasmaha Ar muddo 30 daqiiqo ah si looga saaro wasakhda ku nuugta dusha sare.

●Ka dib dufcad kasta oo hab-raac ah, SC1 (NH₄OH:H₂O₂:H₂O=1:1:5) ayaa loo isticmaalaa nadiifinta si looga saaro haraaga dabiiciga ah.

✔ Soo rarista waxyaabaha mamnuuca ah:

●Rarka xad-dhaafka ah waa mamnuuc (tusaale ahaan, awoodda ugu badan waxaa loogu talagalay inay noqoto 50 xabbo, laakiin culayska dhabta ah waa inuu ahaadaa ≤ 45 xabbo si loo helo meel bannaan oo lagu ballaarin karo).

●Cidhifka waferku waa inuu ka fogaadaa ≥2mm dhammaadka haanta doonta si looga hortago saamaynta cidhifka balaasmaha.

✔ Talooyin ku saabsan Kordhinta Nolosha

● Dayactirka dahaarka: Marka dusha sare ee qalafsanaantu tahay Ra＞1.2μm, dahaarka SiC waxaa dib u dhigi kara CVD (qiimuhu waa 40% ka hooseeya beddelka).

✔ Baaritaan joogto ah:

● Bishiiba: Hubi daacadnimada dahaarka adoo isticmaalaya interferometry iftiin cad.
●Saddexdii biloodba mar: Falanqee heerka kiristaalka ee doonida iyada oo loo marayo XRD (doonta quartz wafer oo leh wejiga kiristaalka > 5% ayaa loo baahan yahay in la beddelo).

4. Waa maxay dhibaatooyinka caadiga ah?

S1: Ma sameyn karaaDoonta PECVDloo isticmaali karaa habka LPCVD?

J: Laguma talinayo! LPCVD waxay leedahay heerkul sare (badanaa 800-1100°C) waxayna u baahan tahay inay u adkaysato cadaadiska gaaska oo sarreeya. Waxay u baahan tahay isticmaalka agab u adkaysta isbeddellada heerkulka (sida isostatic graphite), naqshadda booskana waxay u baahan tahay inay tixgeliso magdhowga ballaarinta kulaylka.
S2: Sidee loo go'aamiyaa in meydka doontu uu fashilmay iyo in kale?

J: Jooji isticmaalka isla markiiba haddii calaamadaha soo socda ay soo baxaan:
Dildilaaca ama diirka dahaarka ayaa isha qaawan laga arki karaa.
Kala beddelka caadiga ah ee isku-dhafka dahaarka wafer wuxuu ahaa >5% saddex dufcadood oo isku xiga.
Heerka faaruqnimada ee qolka hawsha ayaa hoos u dhacay in ka badan 10%.

S3: Doonta Graphite iyo doonta quartz, sidee loo doortaa?

Gunaanad: Doonyaha garaafitka ayaa loo doorbidaa xaaladaha wax soo saarka ballaaran, halka doonyaha quartz loo tixgeliyo cilmi-baaris/hawlgallo gaar ah.

Gunaanad:

Inkasta ooDoonta PECVDMa aha qalabka ugu muhiimsan, waa "ilaaliyaha aamusan" ee xasilloonida habka. Laga bilaabo xulashada ilaa dayactirka, faahfaahin kasta waxay noqon kartaa meel muhiim ah oo lagu horumariyo wax soo saarka. Waxaan rajeynayaa in hagahan uu kaa caawin doono inaad dhex gasho ceeryaanta farsamada oo aad hesho xalka ugu habboon ee lagu dhimayo kharashka iyo horumarinta hufnaanta!