CVDMkpuchi SiCna-agbanwe oke usoro mmepụta semiconductor n'ụzọ dị egwu. Teknụzụ mkpuchi a dị ka ihe dị mfe aghọwo ihe ngwọta dị mkpa maka ihe ịma aka atọ bụ isi nke mmetọ ihe, nchara okpomọkụ dị elu na mbuze plasma na mmepụta chip. Ndị na-emepụta akụrụngwa semiconductor kachasị elu n'ụwa edepụtala ya dị ka teknụzụ ọkọlọtọ maka akụrụngwa ọgbọ na-abịa. Yabụ, gịnị mere mkpuchi a ji bụrụ "ihe agha a na-adịghị ahụ anya" nke imepụta chip? Isiokwu a ga-enyocha nke ọma ụkpụrụ teknụzụ ya, ngwa ndị bụ isi na ihe ndị a na-enweta n'ọkwa kachasị elu.
Ⅰ. Nkọwa nke mkpuchi CVD SiC
Mkpuchi CVD SiC na-ezo aka na oyi akwa nchekwa nke silicon carbide (SiC) nke etinyere n'elu ihe e ji eme ihe site na usoro nchekwa anwụrụ ọkụ (CVD). Silicon carbide bụ ngwakọta nke silicon na carbon, nke a maara maka ike ya dị mma, ike okpomọkụ dị elu, enweghị ike kemịkalụ na iguzogide okpomọkụ dị elu. Teknụzụ CVD nwere ike ịmepụta oyi akwa SiC dị ọcha, siri ike ma sie ike, ma nwee ike ịdị ka nke geometry dị mgbagwoju anya. Nke a na-eme ka mkpuchi CVD SiC dị mma maka ngwa siri ike nke enweghị ike imezu site na ihe ndị nkịtị ma ọ bụ ụzọ mkpuchi ndị ọzọ.
Ⅱ. Ụkpụrụ usoro CVD
Ndobe anwụrụ kemịkalụ (CVD) bụ ụzọ nrụpụta dị iche iche e si emepụta ihe siri ike dị elu ma dị elu. Isi ihe dị na CVD gụnyere mmeghachi omume nke ihe ndị na-ebute gas n'elu ihe mkpuchi ọkụ iji mepụta mkpuchi siri ike.
Nke a bụ nkọwa dị mfe nke usoro SiC CVD:
Usoro CVD bụ ụkpụrụ eserese
1. Okwu mmeghe tupu ihe: A na-etinye ihe ndị na-ebute gas, nke a na-akpọkarị gas nwere silicon (dịka ọmụmaatụ, methyltrichlorosilane – MTS, maọbụ silane – SiH₄) na gas nwere carbon (dịka ọmụmaatụ, propane – C₃H₈), n'ime ụlọ mmeghachi omume.
2. Nnyefe gas: Gas ndị a na-ebute ụzọ na-asọfe n'elu ihe na-ekpo ọkụ.
3. Adsorption: Mkpụrụ ndụ ihe nketa precursor na-abanye n'elu ihe na-ekpo ọkụ.
4. Mmeghachi omume elu: N'oge okpomọkụ dị elu, mkpụrụ ndụ ihe ndị a na-amịkọrọ na-enweta mmeghachi omume kemịkalụ, nke na-eme ka ihe ndị dị na precursor gbawaa ma mepụta ihe nkiri SiC siri ike. A na-ewepụta ihe ndị sitere na ya n'ụdị gas.
5. Mkpọpụta na iwụfu: Ngwaahịa gas ndị sitere na ya na-apụ n'elu wee si n'ime ụlọ ahụ pụọ. Njikwa nke okpomọkụ, nrụgide, ọsọ mmiri gas na ntinye ihe dị mkpa dị oke mkpa iji nweta ihe oyiyi ihe nkiri achọrọ, gụnyere ọkpụrụkpụ, ịdị ọcha, kristal na njikọta.
Ⅲ. Ojiji nke mkpuchi CVD SiC na usoro semiconductor
Mkpuchi CVD SiC dị oke mkpa na mmepụta semiconductor n'ihi na njikọta pụrụ iche nke ihe onwunwe ha na-emezu kpọmkwem ọnọdụ dị oke njọ na ihe achọrọ dị ọcha siri ike nke gburugburu ebe nrụpụta. Ha na-eme ka iguzogide nchara plasma, mwakpo kemịkalụ, na mmepụta ihe dị n'ime ya ka mma, ihe ndị a niile dị mkpa iji mee ka mmepụta wafer na akụrụngwa dịkwuo mma.
Ihe ndị a bụ ụfọdụ akụkụ mkpuchi CVD SiC a na-ahụkarị na ọnọdụ ngwa ha:
1. Ụlọ Ịcha Plasma na Mgbaaka Nlebara Anya
Ngwaahịa: Ihe mkpuchi mkpuchi CVD SiC, isi ịsa ahụ, ihe ndị na-egbochi, na mgbaaka lekwasịrị anya.
Ngwa: N'ịkpụcha ihe na plasma, a na-eji plasma dị oke arụ ọrụ iji wepụ ihe ndị dị na wafers. Ihe ndị a na-ekpuchighị ekpuchi ma ọ bụ ndị na-adịghị adịgide adịgide na-emebi ngwa ngwa, na-ebute mmetọ ihe na oge nkwụsị ugboro ugboro. Mkpuchi CVD SiC nwere ezigbo iguzogide kemịkalụ plasma siri ike (dịka ọmụmaatụ, fluorine, chlorine, bromine plasmas), na-agbatị ndụ nke ihe ndị dị mkpa n'ime ụlọ, ma na-ebelata mmepụta ihe, nke na-eme ka mmepụta wafer dịkwuo elu ozugbo.
2. Ụlọ PECVD na HDPCVD
Ngwaahịa: Ụlọ mmeghachi omume mkpuchi CVD SiC na elektrọd.
Ngwa: A na-eji plasma eme ka ikuku kpụọ nke kemịkalụ emelitere (PECVD) na plasma CVD dị elu (HDPCVD) etinye ihe nkiri dị gịrịgịrị (dịka ọmụmaatụ, oyi akwa dielectric, oyi akwa passivation). Usoro ndị a na-agụnyekwa gburugburu plasma siri ike. Mkpuchi CVD SiC na-echebe mgbidi ụlọ na elektrọd site na mbuze, na-ahụ na ihe nkiri ahụ na-adị mma ma na-ebelata ntụpọ.
3. Ngwa ntinye ion
NgwaahịaIhe mejupụtara eriri mkpuchi CVD SiC (dịka ọmụmaatụ, oghere, iko Faraday).
Ngwa: Itinye ion n'ime ihe ndị na-emepụta semiconductor. Ogwe ion nwere ike dị elu nwere ike ibute mgbasa na mbuze nke ihe ndị a na-ekpughe. Ike siri ike na ịdị ọcha dị elu nke CVD SiC na-ebelata mmepụta ihe ndị sitere na ihe ndị na-emepụta beamline, na-egbochi mmetọ nke wafers n'oge usoro doping dị oke mkpa a.
4. Ihe ndị mejupụtara ihe na-eme ihe na Epitaxial
Ngwaahịa: Ihe mkpuchi mkpuchi nke CVD SiC na ndị na-ekesa gas.
Ngwa: Epitaxial growth (EPI) gụnyere ịkụnye akwa kristal dị oke mma n'elu ihe e ji eme ihe n'oge okpomọkụ dị elu. Ihe e ji eme ihe mkpuchi CVD SiC na-enye ezigbo nkwụsi ike okpomọkụ na enweghị ike kemịkalụ n'oge okpomọkụ dị elu, na-eme ka a hụ na a na-ekpo ọkụ otu otu ma na-egbochi mmetọ nke ihe e ji eme ihe n'onwe ya, nke dị oke mkpa iji nweta akwa epitaxial dị elu.
Ka geometri chip na-ebelata ma mkpa usoro na-akawanye njọ, ọchịchọ maka ndị na-ebunye mkpuchi CVD SiC dị elu na ndị na-emepụta mkpuchi CVD na-aga n'ihu na-eto.
IV. Kedu ihe ịma aka nke usoro mkpuchi CVD SiC?
N'agbanyeghị nnukwu uru dị na mkpuchi CVD SiC, nrụpụta na ojiji ya ka na-eche ụfọdụ nsogbu usoro ihu. Idozi ihe ịma aka ndị a bụ isi ihe na-eme ka arụmọrụ kwụsiri ike na ịdị irè ọnụ ahịa.
Ihe ịma aka:
1. Nrapara na ihe mkpuchi
SiC nwere ike isi ike inweta nrapado siri ike ma kwekọọ na ihe dị iche iche dị n'ime ala (dịka ọmụmaatụ, graphite, silicon, seramiiki) n'ihi ọdịiche dị na njupụta okpomọkụ na ike elu. Nrapado na-adịghị mma nwere ike ibute mmebi n'oge usoro okpomọkụ ma ọ bụ nrụgide igwe.
Ngwọta:
Nkwadebe elu: Nhicha na ọgwụgwọ elu nke ọma (dịka ọmụmaatụ, ịchacha, ọgwụgwọ plasma) nke ihe mejupụtara ahụ iji wepụ ihe ndị na-emerụ ahụ ma mepụta elu kachasị mma maka njikọta.
Ngwakọta ibe: Debe akwa dị gịrịgịrị ma ọ bụ ihe nchekwa nke ahaziri ahazi (dịka ọmụmaatụ, pyrolytic carbon, TaC - nke yiri mkpuchi CVD TaC na ngwa ụfọdụ) iji belata enweghị ike ịgbasa okpomọkụ ma kwalite njikọta.
Mee ka paramita nkwụnye ego ka mma: Jiri nlezianya chịkwaa okpomọkụ, nrụgide, na oke gas iji mee ka ihe nkiri SiC dịkwuo mma ma kwalite njikọ siri ike n'etiti ihu.
2. Nrụgide na Mkpọwa Ihe nkiri
N'oge a na-etinye ihe ma ọ bụ na-ajụ oyi mgbe nke ahụ gasịrị, nrụgide fọdụrụnụ nwere ike ịmalite n'ime ihe nkiri SiC, na-akpata mgbawa ma ọ bụ mgbagọ, karịsịa na geometry buru ibu ma ọ bụ nke dị mgbagwoju anya.
Ngwọta:
Njikwa Okpomọkụ: chịkwaa ọnụego okpomọkụ na oyi nke ọma iji belata ujo okpomọkụ na nrụgide.
Mkpuchi Gradient: Jiri usoro mkpuchi dị iche iche ma ọ bụ nke gradient gbanwee ihe mejupụtara ihe ma ọ bụ nhazi ya nwayọ nwayọ iji kwado nrụgide.
Mgbakwunye Mgbakwunye Mgbe E Dechara: Mee ka akụkụ ndị e ji kpuchie akpụkpọ ahụ dị nro kwụsị nrụgide fọdụrụnụ ma melite iguzosi ike n'ezi ihe nke fim ahụ.
3. Nkwekọ na Ịdị n'otu na Jiometrị Dị Mgbagwoju Anya
Itinye mkpuchi dị oke arọ na nke na-agbanwe agbanwe n'akụkụ ndị nwere ọdịdị dị mgbagwoju anya, oke akụkụ dị elu, ma ọ bụ ọwa dị n'ime nwere ike isi ike n'ihi oke mgbasa nke precursor na kinetics reaction.
Ngwọta:
Nhazi Nhazi Reactor: Mepụta ihe nrụpụta CVD nwere ike ịhazi usoro mgbasa gas kachasị mma na ịdị n'otu okpomọkụ iji hụ na ekesara ihe ndị na-ebute ụzọ n'otu ụzọ.
Mgbanwe Usoro: Gbanwee nrụgide nkwụnye, ọsọ mmiri, na ntinye ihe tupu oge eruo iji mee ka mgbasa nke gas dịkwuo mma n'ime ihe ndị dị mgbagwoju anya.
Ndokwa dị iche iche: Jiri usoro nkwụnye ihe na-aga n'ihu ma ọ bụ ihe ndị na-agbanwe agbanwe iji hụ na e kpuchiri elu niile nke ọma.
V. Ajụjụ Ndị A Na-ajụkarị
Q1: Kedu ihe dị iche n'etiti CVD SiC na PVD SiC na ngwa semiconductor?
A: Mkpuchi CVD bụ ihe owuwu kristal kọlụm nwere ịdị ọcha nke >99.99%, dabara adaba maka gburugburu plasma; Mkpuchi PVD bụkarị amorphous/nanocrystalline nwere ịdị ọcha nke <99.9%, a na-ejikarị ya eme ihe maka mkpuchi mma.
Q2: Kedu okpomọkụ kachasị elu nke mkpuchi ahụ nwere ike idi?
A: Ntachi obi nwa oge nke 1650°C (dịka usoro annealing), oke ojiji ogologo oge nke 1450°C, gafere okpomọkụ a ga-eme ka mgbanwe nkebi site na β-SiC gaa na α-SiC.
Q3: Oke ọkpụrụkpụ mkpuchi nkịtị?
A: Akụkụ semiconductor na-abụkarị 80-150μm, mkpuchi EBC nke injin ụgbọelu nwere ike iru 300-500μm.
Q4: Kedu ihe ndị bụ isi na-emetụta ọnụ ahịa?
A: Ịdị ọcha nke ihe mkpuchi dị elu (40%), oriri ike nke akụrụngwa (30%), mfu nke ihe (20%). Ọnụ ahịa otu nke mkpuchi dị elu nwere ike iru $5,000/kg.
Q5: Kedu ndị bụ isi na-eweta ngwaahịa zuru ụwa ọnụ?
A: Yuropu na mba Amerịka: CoorsTek, Mersen, Ionbond; Eshia: Semixlab, Veteksemicon, Kallex (Taiwan), Scietech (Taiwan)
Oge ozi: Jun-09-2025