Ungayikhetha kanjani, uyisebenzise futhi uyinakekele kanjani isikebhe se-PECVD?

1. Siyini isikebhe se-PECVD?

1.1 Incazelo kanye nemisebenzi eyinhloko

Isikebhe se-PECVD (i-Plasma Enhanced Chemical Vapor Deposition) siyithuluzi eliyinhloko elisetshenziselwa ukuthwala ama-wafer noma ama-substrate enqubweni ye-PECVD. Sidinga ukusebenza ngokuzinzile endaweni yokushisa ephezulu (300-600°C), igesi evuselelwa yi-plasma kanye negesi ebolile (njenge-SiH₄, NH₃). Imisebenzi yaso eyinhloko ifaka:

● Ukubeka kahle: qinisekisa ukuthi izikhala ze-wafer ziyafana futhi ugweme ukuphazamiseka kokumboza.
● Ukulawulwa kwensimu yokushisa: lungisa ukusatshalaliswa kwezinga lokushisa futhi uthuthukise ukufana kwefilimu.
● Isithiyo sokulwa nokungcola: Sihlukanisa i-plasma emgodini wemishini ukuze sinciphise ingozi yokungcoliswa kwensimbi.

1.2 Izakhiwo nezinto ezijwayelekile

Ukukhetha izinto:

● Isikebhe se-graphite (ukukhetha okujwayelekile): ukuhanjiswa kokushisa okuphezulu, ukumelana nokushisa okuphezulu, izindleko eziphansi, kodwa kudinga ukumbozwa ukuze kuvinjelwe ukugqwala kwegesi.
●Isikebhe se-Quartz: Ubumsulwa obuphezulu kakhulu, simelana namakhemikhali, kodwa siyaphuka futhi siyabiza kakhulu.
●I-Ceramics (njenge-Al₂O₃): ayigugi, ifanele ukukhiqizwa kwemvamisa ephezulu, kodwa ayisebenzi kahle ekushiseni.

Izici ezibalulekile zokuklama:

● Isikhala sesikhala: Fanisa ubukhulu be-wafer (njengokubekezelelana okungu-0.3-1mm).
●Umklamo wembobo yokugeleza komoya: lungisa ukusatshalaliswa kwegesi yokusabela futhi unciphise umphumela womphetho.
●Ukugqoka okungaphezulu: Ukugqoka okujwayelekile kwe-SiC, i-TaC noma i-DLC (ikhabhoni efana nedayimane) ukuze kwandiswe impilo yesevisi.

2. Kungani kufanele sinake ukusebenza kwezikebhe ze-PECVD?

2.1 Izici ezine ezinkulu ezithinta ngqo isivuno senqubo

✔ Ukulawulwa Kokungcola:
Ukungcola emzimbeni wesikebhe (njenge-Fe ne-Na) kuyashintshashintsha emazingeni okushisa aphezulu, okubangela ukuvuza kwemigodi noma ukuvuza efilimini.
Ukuqhekeka kwesembozo kuzoletha izinhlayiya futhi kubangele ukukhubazeka kwesembozo (isibonelo, izinhlayiya ezingaphezu kuka-0.3μm zingabangela ukusebenza kahle kwebhethri kwehle ngo-0.5%).

✔ Ukufana kwensimu yokushisa:
Ukushisa okungalingani kwesikebhe se-graphite se-PECVD kuzoholela ekwehlukeni kobukhulu befilimu (isibonelo, ngaphansi kwemfuneko yokufana engu-±5%, umehluko wokushisa udinga ukuba ngaphansi kuka-10°C).

✔ Ukuhambisana kwe-Plasma:
Izinto ezingalungile zingabangela ukukhishwa okungavamile futhi zilimaze i-wafer noma ama-electrode edivayisi.

✔ Impilo yesevisi kanye nezindleko:
Imikhumbi yesikebhe esezingeni eliphansi idinga ukushintshwa njalo (isib. kanye ngenyanga), futhi izindleko zokulungisa zonyaka ziyabiza.

3. Ungayikhetha kanjani, uyisebenzise futhi uyinakekele kanjani isikebhe se-PECVD?

3.1 Indlela yokukhetha enezinyathelo ezintathu

Isinyathelo 1: Cacisa amapharamitha enqubo

● Ububanzi bokushisa: Isembozo se-Graphite + SiC singakhethwa ngaphansi kuka-450°C, kanti i-quartz noma i-ceramic iyadingeka ngaphezu kuka-600°C.
●Uhlobo lwegesi: Uma kuqukethe amagesi agqwalisayo njenge-Cl2 ne-F-, ukugqoka okuphezulu kumele kusetshenziswe.
●Usayizi we-wafer: Amandla esakhiwo sesikebhe esingu-8-intshi/12-intshi ahluke kakhulu futhi adinga umklamo oqondiwe.

Isinyathelo 2: Hlola izilinganiso zokusebenza

Amamethrikhi Abalulekile:

●Ubulukhuni bomphezulu (Ra): ≤0.8μm (umphezulu wokuthintana udinga ukuba ≤0.4μm)
●Amandla esibopho sokumboza: ≥15MPa (i-ASTM C633 ejwayelekile)
●Ukuguquguquka kwezinga lokushisa eliphezulu (600℃): ≤0.1mm/m (ukuhlolwa kwamahora angama-24)

Isinyathelo 3: Qinisekisa ukuhambisana

● Ukufanisa imishini: Qinisekisa usayizi wesixhumi esibonakalayo ngamamodeli ajwayelekile njenge-AMAT Centura, i-centrotherm PECVD, njll.
● Ukuhlolwa kokukhiqiza kwesilingo: Kunconywa ukwenza ukuhlolwa kweqembu elincane lezingcezu ezingama-50-100 ukuqinisekisa ukufana kwesembozo (ukuphambuka okujwayelekile kobukhulu befilimu <3%).

3.2 Imikhuba Emihle Yokusetshenziswa Nokunakekelwa

Imininingwane Yokusebenza:

✔Inqubo yokuhlanza ngaphambi kwesikhathi:

● Ngaphambi kokusetshenziswa kokuqala, i-Xinzhou idinga ukugcotshwa nge-Ar plasma imizuzu engama-30 ukuze kususwe ukungcola okufakwe ebusweni.

●Ngemva kweqoqo ngalinye lenqubo, i-SC1 (NH₄OH:H₂O₂:H₂O=1:1:5) isetshenziselwa ukuhlanza ukususa izinsalela zezinto eziphilayo.

✔ Ukulayisha ama-taboos:

●Ukulayisha ngokweqile akuvunyelwe (isb. umthamo omkhulu wenzelwe ukuba yizicucu ezingama-50, kodwa umthwalo wangempela kufanele ube yizicucu ezingama-≤ ezingama-45 ukuze kugcinwe isikhala sokwandiswa).

●Unqenqema lwe-wafer kumele lube ≥2mm ukusuka ekugcineni kwethangi lesikebhe ukuvimbela imiphumela yonqenqema lwe-plasma.

✔ Amathiphu Okwandisa Impilo

● Ukulungiswa kokumboza: Uma ukugoba kobuso kungu-Ra ＞1.2μm, ukumboza kwe-SiC kungaphinde kufakwe yi-CVD (izindleko ziphansi ngo-40% kunokufaka esikhundleni).

✔ Ukuhlolwa okuvamile:

● Nyanga zonke: Hlola ubuqotho bokumboza usebenzisa i-interferometry yokukhanya okumhlophe.
●Ngekota: Hlaziya izinga lokwakheka kwekristalu lesikebhe nge-XRD (isikebhe se-quartz wafer esine-crystal phase > 5% sidinga ukushintshwa).

4. Yiziphi izinkinga ezivamile?

Umbuzo 1: Ingabe i-Isikebhe se-PECVDingasetshenziswa enqubweni ye-LPCVD?

A: Akunconywa! I-LPCVD inokushisa okuphezulu (ngokuvamile okungu-800-1100°C) futhi idinga ukumelana nomfutho wegesi ophezulu. Idinga ukusetshenziswa kwezinto ezimelana kakhulu nokushintsha kwezinga lokushisa (njenge-isostatic graphite), futhi umklamo wesikhala udinga ukucabangela isinxephezelo sokwandiswa kokushisa.
Umbuzo 2: Unganquma kanjani ukuthi umzimba wesikebhe awuphumelelanga?

A: Yeka ukusebenzisa ngokushesha uma kuvela izimpawu ezilandelayo:
Ukuqhekeka noma ukuqhekeka kwesikhumba kubonakala ngamehlo enyama.
Ukuphambuka okujwayelekile kokufana kwe-wafer coating kube ngaphezulu kuka-5% kumaqoqo amathathu alandelanayo.
Izinga le-vacuum legumbi lenqubo lehle ngaphezu kuka-10%.

Q3: Isikebhe se-Graphite vs. isikebhe se-quartz, ungakhetha kanjani?

Isiphetho: Izikebhe ze-graphite zikhethwa kakhulu ezimweni zokukhiqiza ngobuningi, kuyilapho izikebhe ze-quartz zicatshangelwa ucwaningo lwesayensi/izinqubo ezikhethekile.

Isiphetho:

NakubaIsikebhe se-PECVDakuyona imishini eyinhloko, "ingumqaphi othule" wokuzinza kwenqubo. Kusukela ekukhetheni kuya ekunakekelweni, yonke imininingwane ingaba yindawo ebalulekile yokuthuthukisa isivuno. Ngiyethemba ukuthi lo mhlahlandlela uzokusiza ukuthi ungene enkingeni yobuchwepheshe futhi uthole ikhambi elifanele lokunciphisa izindleko kanye nokuthuthukisa ukusebenza kahle!