I-CVDUkugqoka kwe-SiCishintsha imikhawulo yezinqubo zokukhiqiza ama-semiconductor ngesivinini esimangalisayo. Lobu buchwepheshe bokumboza obubonakala bulula bube yisisombululo esiyinhloko sezinselele ezintathu eziyinhloko zokungcoliswa kwezinhlayiya, ukugqwala kwezinga lokushisa eliphezulu kanye nokuguguleka kwe-plasma ekukhiqizeni ama-chip. Abakhiqizi bemishini ye-semiconductor abaphambili emhlabeni bayibhale njengobuchwepheshe obujwayelekile bemishini yesizukulwane esilandelayo. Ngakho-ke, yini eyenza lokhu kumboza kube “yisivikelo esingabonakali” sokukhiqiza ama-chip? Lesi sihloko sizohlaziya ngokujulile izimiso zaso zobuchwepheshe, ukusetshenziswa okuyinhloko kanye nokuphumelela okuphambili.
Ⅰ. Incazelo yengubo ye-CVD SiC
Ukuhlanganiswa kwe-CVD SiC kubhekisela kungqimba oluvikelayo lwe-silicon carbide (SiC) efakwe ku-substrate ngenqubo yokufakwa komusi wamakhemikhali (CVD). I-Silicon carbide iyinhlanganisela ye-silicon ne-carbon, eyaziwa ngokuqina kwayo okuhle kakhulu, ukuhanjiswa kokushisa okuphezulu, ukungangeni kwamakhemikhali kanye nokumelana nokushisa okuphezulu. Ubuchwepheshe be-CVD bungakha ungqimba lwe-SiC oluhlanzekile kakhulu, oluqinile futhi olufana nobukhulu, futhi lungahambisana kakhulu namajiyometri ayinkimbinkimbi. Lokhu kwenza ukuhlanganiswa kwe-CVD SiC kufaneleke kakhulu ekusetshenzisweni okudingakalayo okungenakuhlangatshezwa ngezinto zobuningi zendabuko noma ezinye izindlela zokuhlanganisa.
Ⅱ. Isimiso senqubo ye-CVD
Ukufakwa komphunga wamakhemikhali (i-CVD) kuyindlela yokukhiqiza ehlukahlukene esetshenziselwa ukukhiqiza izinto eziqinile ezisezingeni eliphezulu nezisebenza kahle. Isimiso esiyinhloko se-CVD sihilela ukusabela kwezinto ezibangela igesi ebusweni be-substrate efudumele ukuze kwakheke uqweqwe oluqinile.
Nasi incazelo elula yenqubo ye-SiC CVD:
Umdwebo wesimiso senqubo ye-CVD
1. Isingeniso sangaphambi kwesikhombisi: Ama-gaseous precursors, ngokuvamile amagesi aqukethe i-silicon (isb., i-methyltrichlorosilane – MTS, noma i-silane – SiH₄) kanye namagesi aqukethe i-carbon (isb., i-propane – C₃H₈), afakwa ekamelweni lokusabela.
2. Ukulethwa kwegesi: La magesi angaphambili ageleza phezu kwesisekelo esishisayo.
3. Ukumuncwa: Ama-molecule angaphambi kwe-cursor amuncwa ebusweni be-substrate eshisayo.
4. Ukusabela okuphezulu: Emazingeni okushisa aphezulu, ama-molecule afakwe emanzini abhekana nokusabela kwamakhemikhali, okuholela ekuqhekekeni kwesandulela kanye nokwakheka kwefilimu eqinile ye-SiC. Imikhiqizo ephumayo ikhishwa ngesimo samagesi.
5. Ukususwa komoya kanye nokukhipha umoya: Imikhiqizo ephuma kugesi iphuma ebusweni bese ikhipha umoya ekamelweni. Ukulawulwa okunembile kokushisa, ingcindezi, izinga lokugeleza kwegesi kanye nokuhlushwa kwe-precursor kubalulekile ekufezeni izakhiwo zefilimu ezifiselekayo, okuhlanganisa ukujiya, ubumsulwa, ukwakheka kwekristalu kanye nokunamathela.
Ⅲ. Ukusetshenziswa Kwezimbozo Ze-CVD SiC Ezinqubweni Ze-Semiconductor
Izembozo ze-CVD SiC zibalulekile ekukhiqizweni kwe-semiconductor ngoba inhlanganisela yazo eyingqayizivele yezakhiwo ihlangabezana ngqo nezimo ezimbi kakhulu kanye nezidingo zobumsulwa obuqinile bendawo yokukhiqiza. Zithuthukisa ukumelana nokugqwala kwe-plasma, ukuhlaselwa ngamakhemikhali, kanye nokukhiqizwa kwezinhlayiya, konke okubalulekile ekwandiseni isivuno se-wafer kanye nesikhathi sokusebenza kwemishini.
Okulandelayo ezinye zezingxenye ezivamile ze-CVD SiC ezimbozwe kanye nezimo zokusetshenziswa kwazo:
1. Igumbi Lokuqopha I-Plasma kanye neRing Yokugxila
Imikhiqizo: Ama-liners ambozwe nge-CVD SiC, ama-showerhead, ama-susceptor, kanye nama-focus rings.
Isicelo: Ekuqopheni i-plasma, i-plasma esebenzayo kakhulu isetshenziswa ukususa izinto eziphuma kuma-wafer ngokukhetha. Izinto ezingamboziwe noma ezingaqinile kangako ziwohloka ngokushesha, okuholela ekungcoleni kwezinhlayiya kanye nesikhathi sokungasebenzi njalo. Izimbozo ze-CVD SiC zinokumelana okuhle kakhulu namakhemikhali e-plasma anamandla (isb., i-fluorine, i-chlorine, ama-plasma e-bromine), zandisa impilo yezingxenye ezibalulekile zegumbi, futhi zinciphise ukukhiqizwa kwezinhlayiya, okwandisa ngqo isivuno se-wafer.
2. Amakamelo e-PECVD kanye ne-HDPCD
Imikhiqizo: Amakamelo okusabela ambozwe yi-CVD SiC kanye nama-electrode.
Izicelo: Ukufakwa komoya wamakhemikhali othuthukisiwe nge-plasma (i-PECVD) kanye ne-high density plasma CVD (i-HDPCVD) kusetshenziselwa ukufaka amafilimu amancane (isb., izendlalelo ze-dielectric, izendlalelo ze-passivation). Lezi zinqubo zihilela nezindawo ezinzima ze-plasma. Izembozo ze-CVD SiC zivikela izindonga zegumbi kanye nama-electrode ekugugulekeni, ziqinisekisa ikhwalithi yefilimu ehambisanayo futhi zinciphisa amaphutha.
3. Imishini yokufaka i-ion
Imikhiqizo: Izingxenye ze-beamline ezimbozwe yi-CVD SiC (isb., izimbobo, izinkomishi ze-Faraday).
Izicelo: Ukufakelwa kwe-ion kungenisa ama-ion angenayo i-dopant kuma-substrate e-semiconductor. Imisebe ye-ion enamandla aphezulu ingabangela ukuchitheka nokuguguleka kwezingxenye eziveziwe. Ubulukhuni kanye nokuhlanzeka okuphezulu kwe-CVD SiC kunciphisa ukukhiqizwa kwezinhlayiya ezivela ezingxenyeni ze-beamline, kuvimbela ukungcoliswa kwama-wafer phakathi nalesi sinyathelo esibalulekile sokusebenzisa i-doping.
4. Izingxenye ze-reactor ze-Epitaxial
Imikhiqizo: Ama-susceptor ambozwe nge-CVD SiC kanye nabasabalalisi begesi.
Izicelo: Ukukhula kwe-Epitaxial (EPI) kuhilela ukukhulisa izendlalelo zekristalu ezihlelwe kahle kakhulu ku-substrate emazingeni okushisa aphezulu. Ama-susceptor ambozwe yi-CVD SiC anikeza ukuzinza okuhle kakhulu kokushisa kanye nokungangeni kwamakhemikhali emazingeni okushisa aphezulu, okuqinisekisa ukushisa okufanayo nokuvimbela ukungcoliswa kwe-susceptor uqobo, okubaluleke kakhulu ekufinyeleleni izendlalelo ze-epitaxial ezisezingeni eliphezulu.
Njengoba ama-geometri e-chip encipha futhi izidingo zenqubo zikhula, isidingo sabahlinzeki be-CVD SiC coating abasezingeni eliphezulu kanye nabakhiqizi be-CVD coating siyaqhubeka nokukhula.
IV. Yiziphi izinselele zenqubo yokumboza i-CVD SiC?
Naphezu kwezinzuzo ezinkulu zokugqoka i-CVD SiC, ukukhiqizwa kwayo kanye nokusetshenziswa kwayo kusabhekene nezinselele ezithile zenqubo. Ukuxazulula lezi zinselele kuyisihluthulelo sokufeza ukusebenza okuzinzile kanye nokusebenza kahle kwezindleko.
Izinselele:
1. Ukunamathela ku-substrate
I-SiC ingaba yinselele ukufeza ukunamathela okuqinile nokufanayo ezintweni ezahlukahlukene ze-substrate (isb., i-graphite, i-silicon, i-ceramic) ngenxa yokwehluka kwama-coefficients okwandisa ukushisa kanye namandla angaphezulu. Ukunamathela okubi kungaholela ekuhlukaniseni ngesikhathi sokujikeleza kokushisa noma ukucindezeleka komshini.
Izixazululo:
Ukulungiswa kwendawo: Ukuhlanza ngokucophelela kanye nokwelashwa kwendawo (isb., ukugqwala, ukwelashwa nge-plasma) kwe-substrate ukuze kususwe ukungcola futhi kudale indawo efanele yokubopha.
Izendlalelo ezihlukene: Beka ungqimba oluncane nolwenziwe ngokwezifiso noma ungqimba lwe-buffer (isb., i-pyrolytic carbon, i-TaC – efana ne-CVD TaC coating kuzinhlelo zokusebenza ezithile) ukuze unciphise ukungalingani kokukhula kokushisa nokukhuthaza ukunamathela.
Lungiselela amapharamitha okufaka: Lawula ngokucophelela izinga lokushisa lokufakwa, ingcindezi, kanye nesilinganiso segesi ukuze uthuthukise i-nucleation kanye nokukhula kwamafilimu e-SiC futhi ukhuthaze ukubopha okuqinile kwe-interfacial.
2. Ukucindezeleka Kwefilimu Nokuqhekeka
Ngesikhathi sokufakwa noma ukupholisa okulandelayo, ukucindezeleka okusele kungavela ngaphakathi kwamafilimu e-SiC, okubangela ukuqhekeka noma ukugoba, ikakhulukazi kumajiyometri amakhulu noma ayinkimbinkimbi.
Izixazululo:
Ukulawula Izinga Lokushisa: Lawula ngokunembile amazinga okushisa nokupholisa ukuze unciphise ukushaqeka nokucindezeleka kokushisa.
Ukugqoka OkugqamileSebenzisa izindlela zokumboza ezinezingqimba eziningi noma ze-gradient ukushintsha kancane kancane ukwakheka noma isakhiwo sezinto ukuze kuhlangatshezwane nokucindezeleka.
Ukufakwa Kwezinto Ngemva Kokususwa Kwesikhundla: Faka izingxenye ezimboziwe ukuze kuqedwe ukucindezeleka okusele futhi kuthuthukiswe ubuqotho befilimu.
3. Ukuvumelana kanye Nokufana Kumajiyometri Ayinkimbinkimbi
Ukufaka izembozo ezijiyile nezifanayo ezingxenyeni ezinezimo eziyinkimbinkimbi, izilinganiso eziphezulu, noma iziteshi zangaphakathi kungaba nzima ngenxa yemikhawulo ekusakazweni kwangaphambilini kanye ne-kinetics yokusabela.
Izixazululo:
Ukuthuthukiswa Komklamo We-Reactor: Yakha ama-CVD reactor ane-dynamics yokugeleza kwegesi ethuthukisiwe kanye nokufana kwezinga lokushisa ukuqinisekisa ukusatshalaliswa okufanayo kwezinto ezingaphambili.
Ukulungiswa Kwepharamitha Yenqubo: Lungisa kahle ingcindezi yokufaka, izinga lokugeleza, kanye nokuhlushwa kwangaphambili ukuze uthuthukise ukusabalala kwesigaba segesi ezicini eziyinkimbinkimbi.
Ukufakwa kwezigaba eziningi: Sebenzisa izinyathelo zokubeka izinto eziqhubekayo noma izinto ezijikelezayo ukuqinisekisa ukuthi zonke izindawo zimbozwe ngokwanele.
Imibuzo Evame Ukubuzwa
Q1: Uyini umehluko oyinhloko phakathi kwe-CVD SiC kanye ne-PVD SiC kuzinhlelo zokusebenza ze-semiconductor?
A: Izembozo ze-CVD ziyizakhiwo zekristalu ezima-columnar ezinobumsulwa obungu->99.99%, ezifanelekela izindawo ze-plasma; Izembozo ze-PVD ikakhulukazi azinawo ukwakheka/zinama-nanocrystalline nobumsulwa obungu-<99.9%, ezisetshenziswa kakhulu ekuhlobiseni.
Q2: Yiliphi izinga lokushisa eliphezulu kakhulu elingakwazi ukumelana nesembozo?
A: Ukubekezelela isikhathi esifushane okungu-1650°C (njengenqubo yokudonsa), umkhawulo wokusetshenziswa kwesikhathi eside ongu-1450°C, ukudlula leli zinga lokushisa kuzobangela ukuguquka kwesigaba kusuka ku-β-SiC kuya ku-α-SiC.
Q3: Ububanzi obujwayelekile bokujiya kokumboza?
A: Izingxenye ze-semiconductor ngokuvamile zingama-80-150μm, kanti izembozo ze-EBC zenjini yendiza zingafinyelela ku-300-500μm.
UMBUZO 4: Yiziphi izinto ezibalulekile ezithinta izindleko?
A: Ubumsulwa bangaphambi kwesikhathi (40%), ukusetshenziswa kwamandla kwemishini (30%), ukulahlekelwa yisivuno (20%). Intengo yeyunithi yezembozo eziphezulu ingafinyelela ku-$5,000/kg.
UMBUZO 5: Obani abahlinzeki abakhulu bomhlaba wonke?
A: IYurophu ne-United States: CoorsTek, Mersen, Ionbond; I-Asia: Semixlab, Veteksemicon, Kallex (Taiwan), Scientech (Taiwan)
Isikhathi sokuthunyelwe: Juni-09-2025