I-CVDUkwaleka kweSiCitshintsha imida yeenkqubo zokwenziwa kwee-semiconductor ngesantya esimangalisayo. Le teknoloji yokugquma ebonakala ilula ibe sisisombululo esiphambili kwimingeni emithathu ephambili yokungcoliswa kwee-particle, ukugqwala kobushushu obuphezulu kunye nokukhukuliseka kwe-plasma kwimveliso yee-chip. Abavelisi bezixhobo ze-semiconductor abaphambili kwihlabathi bayidwelise njengeteknoloji eqhelekileyo yezixhobo zesizukulwana esilandelayo. Ngoko ke, yintoni eyenza le ngubo ibe "sisikrweqe esingabonakaliyo" sokwenza ii-chip? Eli nqaku liza kuhlalutya ngokunzulu imigaqo yalo yobugcisa, usetyenziso oluphambili kunye nophuhliso oluphambili.
Ⅰ. Inkcazelo ye-CVD SiC coating
I-CVD SiC coating ibhekisa kumaleko okhuselayo we-silicon carbide (SiC) efakwe kwi-substrate yinkqubo ye-chemical vapor deposition (CVD). I-Silicon carbide yinxalenye ye-silicon kunye ne-carbon, eyaziwa ngokuba lukhuni lwayo oluhle kakhulu, ukuqhuba okuphezulu kobushushu, ukungangeni kweekhemikhali kunye nokumelana nobushushu obuphezulu. Itekhnoloji ye-CVD inokwenza umaleko we-SiC ococekileyo kakhulu, oxineneyo nofanayo, kwaye unokuhambelana kakhulu nejometri ezintsonkothileyo. Oku kwenza i-CVD SiC coatings ifaneleke kakhulu kwizicelo ezifuna amandla ezingenakufunyanwa zizixhobo zemveli ezinkulu okanye ezinye iindlela zokufaka.
Ⅱ. Umgaqo wenkqubo ye-CVD
Ukufakwa komphunga wekhemikhali (i-CVD) yindlela yokwenza eguquguqukayo esetyenziselwa ukuvelisa izinto eziqinileyo ezikumgangatho ophezulu nezisebenza kakuhle. Umgaqo ophambili we-CVD ubandakanya ukusabela kwee-precursors zegesi kumphezulu we-substrate eshushu ukuze kwenziwe uqweqwe oluqinileyo.
Nantsi indlela elula yokwahlulahlula inkqubo ye-SiC CVD:
Umzobo womgaqo wenkqubo ye-CVD
1. Intshayelelo yangaphambi kwesikhombisi: Iigesi ezisandula ukwenziwa, ezidla ngokuba ziigesi eziqulathe i-silicon (umz., i-methyltrichlorosilane – MTS, okanye i-silane – SiH₄) kunye neegesi eziqulathe i-carbon (umz., i-propane – C₃H₈), zifakwa kwigumbi lokusabela.
2. Ukuhanjiswa kwegesi: Ezi gesi zangaphambili zihamba phezu kwesiseko esishushu.
3. Ukufunxwa: Iimolekyuli zangaphambili zifunxa kumphezulu we-substrate eshushu.
4. Impendulo yomphezulu: Kumaqondo obushushu aphezulu, iimolekyuli ezifakwe emanzini zifumana iimpembelelo zeekhemikhali, nto leyo ebangela ukubola kwe-precursor kunye nokwakheka kwefilimu eqinileyo ye-SiC. Iimveliso eziphumayo zikhutshwa ngendlela yeegesi.
5. Ukucocwa kunye nokuphuma komoya: Iimveliso zegesi ziyaphuma kumphezulu zize zikhuphe umoya kwigumbi. Ulawulo oluchanekileyo lobushushu, uxinzelelo, isantya sokuhamba kwegesi kunye noxinzelelo lwangaphambili kubalulekile ekufezekiseni iipropati zefilimu ezifunekayo, kubandakanya ubukhulu, ubunyulu, ubukrelekrele kunye nokunamathela.
Ⅲ. Ukusetyenziswa kweeCVD SiC Coatings kwiinkqubo zeSemiconductor
Iingubo zeCVD SiC zibaluleke kakhulu kwimveliso ye-semiconductor kuba indibaniselwano yazo eyahlukileyo yeempawu ihlangabezana ngokuthe ngqo neemeko ezigqithisileyo kunye neemfuno ezingqongqo zococeko lwendalo yokwenziwa. Ziyandisa ukumelana nokugqwala kweplasma, ukuhlaselwa ngamakhemikhali, kunye nokuveliswa kwamasuntswana, konke oku kubalulekile ekukhuliseni isivuno se-wafer kunye nexesha lokusebenza kwezixhobo.
Ezi zilandelayo zezinye zeendawo eziqhelekileyo ezigqunywe yiCVD SiC kunye neemeko zokusetyenziswa kwazo:
1. Igumbi lokuGcina iPlasma kunye neRingi yokugxila
Iimveliso: Ii-CVD SiC coated liners, iishawa, ii-susceptors, kunye nee-focus rings.
Isicelo: Kwi-plasma etching, i-plasma esebenzayo kakhulu isetyenziselwa ukususa izinto kwii-wafers ngokukhetha. Izinto ezingagqunywanga okanye ezingaqinanga kakhulu zibola ngokukhawuleza, nto leyo ebangela ungcoliseko lwamasuntswana kunye nexesha lokungasebenzi rhoqo. Iingubo ze-CVD SiC zinokumelana okuhle kakhulu neekhemikhali ze-plasma ezinamandla (umz., i-fluorine, i-chlorine, ii-bromine plasmas), zandisa ubomi bezinto eziphambili zegumbi, kwaye zinciphisa ukuveliswa kwamasuntswana, nto leyo enyusa ngokuthe ngqo isivuno se-wafer.
2. Iigumbi zePECVD kunye neHDPCD
Iimveliso: Amagumbi okusabela agqunywe yiCVD SiC kunye nee-electrodes.
Izicelo: Ukufakwa komphunga wekhemikhali ophuculweyo wePlasma (iPECVD) kunye ne-high density plasma CVD (i-HDPCVD) zisetyenziselwa ukufaka iifilimu ezincinci (umz., iileya ze-dielectric, iileya ze-passivation). Ezi nkqubo zikwabandakanya neendawo ezinzima zeplasma. Iingubo ze-CVD SiC zikhusela iindonga zegumbi kunye nee-electrodes ekukhukulisekeni, ziqinisekisa umgangatho wefilimu ohambelanayo kwaye zinciphisa iziphene.
3. Izixhobo zokufakelwa kwe-ion
Iimveliso: Izixhobo ze-beamline ezigqunywe yi-CVD SiC (umz., ii-apertures, iikomityi zeFaraday).
Izicelo: Ukufakelwa kwe-ion kungenisa ii-ion ze-dopant kwi-semiconductor substrates. Imisebe ye-ion enamandla aphezulu inokubangela ukutshiza kunye nokukhukuliseka kwezixhobo ezibonakalayo. Ubunzima kunye nobunyulu obuphezulu be-CVD SiC kunciphisa ukuveliswa kwee-particles ezivela kwi-beamline components, kuthintela ungcoliseko lwee-wafers ngeli xesha libalulekileyo lokufaka i-doping.
4. Izixhobo ze-reactor ye-Epitaxial
Iimveliso: Ii-susceptors ezigqunywe nge-CVD SiC kunye nabasasazi begesi.
Izicelo: Ukukhula kwe-Epitaxial (EPI) kubandakanya ukukhulisa iileya zekristale ezicwangcisiweyo kakhulu kwi-substrate kumaqondo obushushu aphezulu. Ii-susceptors ezigqunywe yi-CVD SiC zibonelela ngozinzo oluhle kakhulu lobushushu kunye nokungangeni kweekhemikhali kumaqondo obushushu aphezulu, ukuqinisekisa ukufudumeza okufanayo kunye nokuthintela ungcoliseko lwe-susceptor ngokwayo, nto leyo ibalulekileyo ekufezekiseni iileya ze-epitaxial ezikumgangatho ophezulu.
Njengoko ii-geometri ze-chip zincipha kwaye iimfuno zenkqubo zisanda, imfuno yababoneleli be-CVD SiC abakumgangatho ophezulu kunye nabavelisi be-CVD coating iyaqhubeka nokukhula.
IV. Ziziphi iingxaki zenkqubo yokugquma i-CVD SiC?
Nangona kukho iingenelo ezinkulu zokugquma nge-CVD SiC, ukwenziwa kwayo kunye nokusetyenziswa kwayo kusajongene nemingeni ethile yenkqubo. Ukusombulula le mingeni ngundoqo ekufezekiseni ukusebenza okuzinzileyo kunye nokusebenza kakuhle kweendleko.
Imingeni:
1. Ukunamathela kwi-substrate
I-SiC inokuba nzima ukufikelela ekunamatheleni okuqinileyo nokulinganayo kwizinto ezahlukeneyo ze-substrate (umz., i-graphite, i-silicon, i-ceramic) ngenxa yokwahluka kwii-coefficients zokwandiswa kobushushu kunye namandla omphezulu. Ukunamathela okungalunganga kunokukhokelela ekuqhekekeni ngexesha lokujikeleza kobushushu okanye uxinzelelo loomatshini.
Izisombululo:
Ukulungiswa komphezulu: Ukucoca ngononophelo kunye nonyango lomphezulu (umz., ukugrumba, unyango lweplasma) wesiseko ukuze kususwe izinto ezingcolisayo kwaye kudale umphezulu ofanelekileyo wokubopha.
I-Interlayer: Beka umaleko obhityileyo nowenziwe ngokwezifiso okanye umaleko we-buffer (umz., i-pyrolytic carbon, i-TaC – efana ne-CVD TaC coating kwizicelo ezithile) ukunciphisa ukungalingani kokukhula kobushushu kunye nokukhuthaza ukunamathela.
Lungiselela iiparameter zokubeka: Lawula ngononophelo ubushushu bokubekwa, uxinzelelo, kunye nomlinganiselo wegesi ukuze uphucule ukwakheka kunye nokukhula kweefilimu zeSiC kwaye ukhuthaze ukubopha okuqinileyo kwe-interfacial.
2. Uxinzelelo lweFilimu kunye nokuqhekeka
Ngexesha lokufakwa okanye ukupholisa okulandelayo, uxinzelelo olushiyekileyo lunokukhula kwiifilimu zeSiC, okubangela ukuqhekeka okanye ukugoba, ingakumbi kwiijiyometri ezinkulu okanye ezintsonkothileyo.
Izisombululo:
Ulawulo lobushushu: Lawula ngokuchanekileyo amazinga okufudumeza nokupholisa ukuze unciphise ukutshayiswa kobushushu kunye noxinzelelo.
Ukwaleka kweGradientSebenzisa iindlela zokugquma ezinezintlu ezininzi okanye zegradient ukutshintsha kancinci kancinci ulwakhiwo okanye isakhiwo sezinto ukuze zilungele uxinzelelo.
Ukutsalwa kwe-Annealing emva kokufakwa kwe-Deposition: Faka iindawo ezigqunyiweyo ukuze kususwe uxinzelelo olushiyekileyo kunye nokuphucula ukuthembeka kwefilimu.
3. Ukuhambelana kunye nokufana kwiJiometri ezintsonkothileyo
Ukubeka ii-coatings ezixineneyo nezifanayo kwiindawo ezineemilo ezintsonkothileyo, ii-aspect ratios eziphezulu, okanye ii-internal channels kunokuba nzima ngenxa yemida kwi-precursor diffusion kunye ne-reaction kinetics.
Izisombululo:
Ukuphuculwa koYilo lweReactor: Yila ii-CVD reactors ezine-dynamics yokuhamba kwegesi ephuculiweyo kunye nobushushu obufanayo ukuqinisekisa ukusasazwa okufanayo kwezinto ezingaphambili.
Uhlengahlengiso lweParamitha yeNkqubo: Lungisa uxinzelelo lokufakwa, isantya sokuhamba, kunye noxinzelelo lwangaphambi kwexesha ukuze kuphuculwe ukusasazeka kwegesi kwiimpawu ezintsonkothileyo.
Ukubekwa kwezigaba ezininziSebenzisa amanyathelo okubeka izinto ngokuqhubekayo okanye izixhobo ezijikelezayo ukuqinisekisa ukuba zonke iindawo zigqunywe ngokwaneleyo.
Imibuzo Ebuzwa Rhoqo
Q1: Yintoni umahluko ophambili phakathi kwe-CVD SiC kunye ne-PVD SiC kwizicelo ze-semiconductor?
A: Iingubo zeCVD zizakhiwo zekristale ezikwikholamu ezinobunyulu obungaphezulu kwe-99.99%, ezifanelekileyo kwiindawo zeplasma; Iingubo zePVD azinawo umfuziselo/zine-nanocrystalline kwaye zinobunyulu obungaphantsi kwe-99.9%, ezisetyenziswa kakhulu kwiingubo zokuhombisa.
Umbuzo 2: Lithini iqondo lobushushu eliphezulu elinokumelana nengubo?
A: Ukunyamezelana kwexesha elifutshane kwe-1650°C (njengenkqubo yokukhupha amanzi), umda wokusetyenziswa ixesha elide we-1450°C, ukudlula eli qondo lobushushu kuya kubangela utshintsho lwesigaba ukusuka kwi-β-SiC ukuya kwi-α-SiC.
Q3: Uluhlu oluqhelekileyo lobukhulu bokugquma?
A: Izinto ze-semiconductor ubukhulu becala ziyi-80-150μm, kwaye ii-EBC coating ze-injini yeenqwelo-moya zinokufikelela kwi-300-500μm.
Umbuzo 4: Zeziphi izinto eziphambili ezichaphazela iindleko?
A: Ubumsulwa bangaphambi kwekhava (40%), ukusetyenziswa kwamandla kwezixhobo (30%), ilahleko yesivuno (20%). Ixabiso leyunithi yeengubo eziphezulu linokufikelela kwi-$5,000/kg.
Q5: Ngoobani ababoneleli abaphambili kwihlabathi liphela?
A: IYurophu neMelika: CoorsTek, Mersen, Ionbond; Asia: Semixlab, Veteksemicon, Kallex (Taiwan), Scientech (Taiwan)
Ixesha leposi: Juni-09-2025