CVDGutwikiriza SiCirimo kuvugurura imipaka y'imikorere y'ibikoresho bya semiconductor ku muvuduko utangaje. Iri koranabuhanga risa n'iryoroshye ryo gusiga ryabaye igisubizo cy'ingenzi ku bibazo bitatu by'ingenzi by'ubwandu bw'uduce duto, ingese ikabije y'ubushyuhe n'isuri ya plasma mu gukora ibikoresho bya semiconductor. Inganda zikomeye ku isi zikora ibikoresho bya semiconductor zayishyize ku rutonde nk'ikoranabuhanga risanzwe ku bikoresho byo mu gisekuru gitaha. None se, ni iki gituma iri shyirahamwe riba "intwaro itagaragara" mu gukora ibikoresho bya semiconductor? Iyi nkuru izasesengura byimbitse amahame yayo ya tekiniki, ikoreshwa ry'ingenzi n'iterambere rigezweho.
Ⅰ. Ibisobanuro by'imvange ya CVD SiC
Igishishwa cya CVD SiC kivuga urwego rurinda rwa silicon carbide (SiC) rushyirwa ku butaka hakoreshejwe uburyo bwo gusiga umwuka w’ibinyabutabire (CVD). Silicon carbide ni ihuriro rya silicon na karuboni, rizwiho gukomera kwaryo kwiza, gutwara ubushyuhe bwinshi, kudakora neza kwa shimi no kudakoresha ubushyuhe bwinshi. Ikoranabuhanga rya CVD rishobora gukora urwego rwa SiC rufite ubuziranenge bwinshi, ubunini bunini kandi bungana, kandi rishobora kuba rihuye cyane n’imiterere y’ijimetero igoye. Ibi bituma igishishwa cya CVD SiC kiba cyiza cyane mu bikorwa bigoye bidashobora kuzuzwa n’ibikoresho bisanzwe cyangwa ubundi buryo bwo gusiga.
Ⅱ. Ihame ry'imikorere ya CVD
Gushyira umwuka mu kirere mu buryo bw’imiti (CVD) ni uburyo bwo gukora ibintu byinshi bukoreshwa mu gukora ibikoresho bikomeye kandi bifite imikorere myiza. Ihame nyamukuru rya CVD rikubiyemo uburyo imyuka ikoreshwa ku buso bw’icyuma gishyushye ikora irangi rikomeye.
Dore isesengura ryoroshye ry'uburyo SiC CVD ikora:
Imbonerahamwe y'amahame ngenderwaho ya CVD
1. Intangiriro y'intangiriro: Ibyuma bibanza by’imyuka, akenshi birimo silicon (urugero, methyltrichlorosilane – MTS, cyangwa silane – SiH₄) n’imyuka irimo karuboni (urugero, propane – C₃H₈), byinjizwa mu cyumba cy’ibizamini.
2. Gutanga lisansi: Iyi myuka ibanziriza iyi inyura hejuru y'ubutaka bushyushye.
3. Gushyiramo ibintu mu mubiri: Molekile zibanziriza iyindi zinjira ku buso bw'ubutaka bushyushye.
4. Uburyo bwo gukora ibintu ku buso: Iyo ubushyuhe bwinshi bukabije, molekile zirimo guhumeka zihura n'ingaruka za shimi, bigatuma ikintu cyabanjirije iki gihinduka maze hagakorwa firime ikomeye ya SiC. Ibikomoka kuri iyo miterere birekurwa mu buryo bwa gaze.
5. Gusesagura no gusohora imyuka: Ibikomoka ku byuka biva hejuru hanyuma bigasohora umwuka mu cyumba. Kugenzura neza ubushyuhe, umuvuduko, umuvuduko w'umwuka n'ubwinshi bw'ibice bya mbere ni ingenzi kugira ngo hagerwe ku miterere ya firime ikenewe, harimo ubugari, ubuziranenge, imiterere y'icyuma gifatana n'uburyo gifatana.
Ⅲ. Imikoreshereze ya CVD SiC Coatings mu mikorere ya Semiconductor
Irangi rya CVD SiC ni ingenzi cyane mu nganda za semiconductor kuko imiterere yaryo yihariye yujuje neza ibintu bidasanzwe n'ibisabwa mu buziranenge bw'ibidukikije. Yongera ubudahangarwa ku kwangirika kwa plasma, ibitero bya shimi, no gukora uduce duto, byose bikaba ari ingenzi cyane mu kongera umusaruro wa wafer no gukora ibikoresho mu gihe gikwiye.
Ibikurikira ni bimwe mu bice bisanzwe bitwikiriwe na CVD SiC n'uburyo bikoreshwa:
1. Icyumba cyo gushushanya plasma n'impeta yo kwibandaho
Ibicuruzwa: Udupira twa CVD SiC dutwikiriwe, udupira two kwiyuhagira, udupira two gufunga, n'impeta zo kwibandaho.
Porogaramu: Mu gukata plasma, plasma ikora cyane ikoreshwa mu gukuraho ibikoresho muri wafers mu buryo bwihariye. Ibikoresho bidapfutse cyangwa bidakomeye cyane byangirika vuba, bigatuma uduce duto twanduzwa n'uduce duto kandi bigatuma tudakora neza. Udupira twa CVD SiC dufite ubushobozi bwo kurwanya imiti ihumanya ikirere (urugero: fluorine, chlorine, bromine plasma), twongera igihe cy'ibice by'ingenzi bigize plasma, kandi tukagabanya gukora uduce duto, ibyo bikaba byongera umusaruro wa wafer mu buryo butaziguye.
2.Ibyumba bya PECVD na HDPCVD
Ibicuruzwa: Ibyumba by'imyitozo bya CVD SiC hamwe n'ama-electrode.
Porogaramu: Gushyira umwuka mu maraso (PECVD) hamwe na CVD yo mu maraso ifite ubucucike bwinshi (HDPCVD) bikoreshwa mu gushyiramo uduce duto (urugero: uduce twa dielectric, uduce twa passivation). Izi nzira zirimo kandi ibidukikije bikomeye bya plasma. Ingufu za CVD SiC zirinda inkuta z'icyumba n'amashanyarazi kwangirika, zigatuma filime ihora ikora neza kandi zikagabanya inenge.
3. Ibikoresho byo guteramo iyoni
Ibicuruzwa: Ibice by'imirasire ya CVD SiC (urugero: imyobo, ibikombe bya Faraday).
Porogaramu: Gutera iyoni mu miyoboro y’amashanyarazi (ions) binjiza iyoni zikomoka ku bintu bitera imbaraga nyinshi mu miyoboro y’amashanyarazi. Imiyoboro y’amashanyarazi ifite ingufu nyinshi ishobora gutera gucika kw’ibice byagaragaye. Ubukana n’ubuziranenge bwinshi bwa CVD SiC bigabanya umusaruro w’ibice bikomoka ku bice by’imirasire y’amashanyarazi, bikarinda kwanduza utubuto muri iki gikorwa cy’ingenzi cyo gutera iyoni.
4. Ibice bya reactor ya Epitaxial
Ibicuruzwa: Utwuma dukingira umwuka wa CVD SiC n'udukwirakwiza gazi.
Porogaramu: Gukura kwa Epitaxial (EPI) bikubiyemo gukuraho ibice bya kristale byateguwe neza ku gice cy'ubutaka ku bushyuhe bwinshi. Ibikoresho bya CVD SiC bitwikiriwe na CVD SiC bitanga ubushyuhe bwiza kandi ntibigire ingaruka mbi ku bushyuhe bwinshi, bitanga ubushyuhe bumwe kandi bikarinda kwanduza icyuma ubwacyo, ibi bikaba ari ingenzi cyane kugira ngo hagerwe ku bice bya epitaxial byiza cyane.
Uko imiterere y’imashini zikora (chip geometries) igabanuka n’ibikenewe mu gutunganya ibintu byiyongera, ni ko icyifuzo cy’abatanga imashini zikora ...
IV. Ni izihe mbogamizi ziterwa no gusiga irangi rya CVD SiC?
Nubwo hari ibyiza byinshi byo gusiga irangi rya CVD SiC, gukora no kurikoresha biracyahura n'imbogamizi zimwe na zimwe mu mikorere. Gukemura ibi bibazo ni ingenzi kugira ngo habeho imikorere ihamye no kugabanya ikiguzi.
Imbogamizi:
1. Gufata ku butaka
SiC ishobora kugorana kugera ku gufatana gukomeye kandi kumwe ku bikoresho bitandukanye bya substrate (urugero, grafiti, silikoni, ceramic) bitewe n'itandukaniro ry'ibipimo by'ubushyuhe n'ingufu zo hejuru. Gufatana nabi bishobora gutuma habaho gutandukana mu gihe cy'ihindagurika ry'ubushyuhe cyangwa stress ya mekanike.
Ibisubizo:
Gutegura ubuso: Gusukura no gutunganya ubuso bw'ibimera neza (urugero, gukata, gutunganya plasma) kugira ngo ukureho imyanda no gukora ubuso bwiza bwo gufatana.
Interlayer: Shyiramo urwego rworoshye kandi rwahinduwe (urugero, karubone ya pyrolytic, TaC – isa na CVD TaC coating mu buryo bwihariye) kugira ngo ugabanye ubushyuhe bwo kwaguka no guteza imbere gufatana.
Kunoza ibipimo byo gushyiramo amakuru: Genzura witonze ubushyuhe, umuvuduko, n'ikigereranyo cya gaze kugira ngo wongere uburyo filime za SiC zikura kandi uteze imbere imikoranire ikomeye hagati y'urusobe rw'amashusho.
2. Guhangayika no gucikagurika kwa firime
Mu gihe cyo gushyiramo cyangwa gukonjesha nyuma yaho, ibisigazwa by'imitsi bishobora kuvuka muri firime za SiC, bigatera gucika cyangwa kugorama, cyane cyane ku bumenyi bunini cyangwa bugoye.
Ibisubizo:
Kugenzura ubushyuhe: Genzura neza umuvuduko w'ubushyuhe n'ubukonje kugira ngo ugabanye stress n'ubushyuhe.
Igipfukisho cy'uburemere: Koresha uburyo bwo gusiga ibintu mu byiciro byinshi cyangwa mu buryo bwo gusiga ibintu mu byiciro bitandukanye kugira ngo uhindure buhoro buhoro imiterere y'ibikoresho cyangwa imiterere yabyo kugira ngo bihuze n'imihangayiko.
Gufunga nyuma yo Gutanga Ingwate: Kuramo ibice bitwikiriwe kugira ngo bikureho stress isigaye kandi binoze ubuziranenge bwa filime.
3. Guhuza no guhuza ku miterere y'ibintu bigoye
Gushyiramo irangi ringana kandi rinini ku bice bifite imiterere igoye, imiterere miremire, cyangwa imiyoboro y'imbere bishobora kugorana bitewe n'imbogamizi mu gukwirakwiza kwa mbere n'uburyo bwo gukora ibikorwa.
Ibisubizo:
Gutunganya Imiterere ya Reactor: Kora rektori za CVD zifite imiterere myiza y'umuvuduko wa gaze n'ubushyuhe bungana kugira ngo urebe ko ibintu byabanjirije ibi bikwirakwira mu buryo bumwe.
Guhindura Ibipimo by'Inzira: Kunoza umuvuduko w'amazi asohoka, umuvuduko w'amazi asohoka, n'ubwinshi bw'amazi akoreshwa mbere y'igihe kugira ngo wongere ikwirakwira ry'umwuka mu bice bigoye.
Gutanga amakuru mu byiciro byinshi: Koresha intambwe zo gushyiramo ibintu mu buryo buhoraho cyangwa ibikoresho bizenguruka kugira ngo urebe neza ko ubuso bwose bwasizwe neza.
V. Ibibazo Bikunze Kubazwa
Q1: Ni irihe tandukaniro ry'ingenzi riri hagati ya CVD SiC na PVD SiC mu bikorwa bya semiconductor?
A: Imyambaro ya CVD ni imiterere ya kristu ifite ubuziranenge bwa >99.99%, ikwiriye ahantu hakorerwa plasma; Imyambaro ya PVD ahanini ni amorphous/nanocrystalline ifite ubuziranenge bwa <99.9%, ikoreshwa cyane cyane mu irangi ry'imitako.
Q2: Ni ubushyuhe bwinshi cyane ubwoya bushobora kwihanganira?
A: Kwihanganira ubushyuhe bw'igihe gito bwa 1650°C (nk'uburyo bwo gutera amazi), gukoresha igihe kirekire ntarengwa cya 1450°C, kurenza ubu bushyuhe bizatuma habaho ihinduka ry'icyiciro kuva kuri β-SiC kugera kuri α-SiC.
Q3: Ubunini busanzwe bwo gutwikira?
A: Ibice bya semiconductor ahanini ni 80-150μm, kandi irangi rya moteri y'indege EBC rishobora kugera kuri 300-500μm.
Q4: Ni ibihe bintu by'ingenzi bigira ingaruka ku kiguzi?
A: Ubuziranenge bw'ibipimo mbere y'igihe (40%), ikoreshwa ry'ingufu z'ibikoresho (30%), igihombo cy'umusaruro (20%). Igiciro cy'imyambaro yo mu rwego rwo hejuru gishobora kugera ku $5,000/kg.
Q5: Ni bande batanga ibicuruzwa bikomeye ku isi?
A: Uburayi na Leta Zunze Ubumwe za Amerika: CoorsTek, Mersen, Ionbond; Aziya: Semixlab, Veteksemicon, Kallex (Taiwan), Scientech (Taiwan)
Igihe cyo kohereza: Kamena-09-2025