Mayankho a High-Purity Graphite Heater a Semiconductor Epitaxy

Mu njira zoyezera kutentha kwambiri monga MOCVD (Metal-Organic Chemical Vapor Deposition) ndi kukula kwa SiC epitaxial, kuwongolera kutentha kumatsimikizira mwachindunji kufanana kwa makulidwe a filimu, kuchuluka kwa doping, ndi kuchuluka kwa wafer. Monga gawo lalikulu la kutentha,Chotenthetsera cha Graphite Choyera Kwambiriiyenera kugwira ntchito mokhazikika komanso mosalekeza kutentha kwambiri kopitilira 1600°C mkati mwa malo omwe mpweya umawonongeka kwambiri. Kuphatikiza maphunziro enieni a makasitomala ndi chidziwitso chofunikira cha zinthu, nkhaniyi ikupereka kusanthula kwakuya kwa ubwino waukadaulo, kapangidwe kake, ndi gawo lofunika kwambiri la ma heater a graphite oyera kwambiri popanga ma wafer a semiconductor.

N’chifukwa Chiyani Muyenera Kusankha Chotenthetsera cha Graphite Choyera Kwambiri pa MOCVD Systems?

Mu njira zofunika kwambiri monga MOCVD ndi GaN/SiC epitaxy, ngakhale kusinthasintha kwa kutentha pang'ono (>2°C) kungayambitse kusintha kwa mafunde kapena zolakwika za kristalo mu gawo la epitaxial. Pogwiritsa ntchito kutentha kwakukulu (100–150 W/m·K) komanso kuchuluka kochepa kwambiri kwa kutentha (CTE), zinthu za graphite zoyera bwino zimapangitsa kutentha kukhala kofanana komanso mwachangu kudutsa pamwamba pa susceptor yonse ndi wafer.

Kufanana kwa Malo Otentha ndi Kulamulira Malo Ambiri

Pofuna kuthana ndi kutayika kwa kutentha m'mphepete mwa chipinda cha epitaxy, ma heater a graphite oyeretsedwa kwambiri nthawi zambiri amakhala ndi kapangidwe kowongolera kutentha kodziyimira pawokha m'malo ambiri. Kudzera mu kusintha kolondola kwa malo otetezedwa, mainjiniya amasintha madera ozungulira dera ndi kukana kwa magetsi malinga ndi momwe kutentha kumayendera m'chipindacho. Izi zimasunga kusiyana kwa kutentha m'malo okulirapo a wafer mkati mwa ±1°C, kutsimikizira kusinthasintha kwa magetsi m'ma wafer onse omwe ali pa diski.

Kuwongolera Zomwe Zili M'phuno ndi Kutsimikizira Malo Oyera Kwambiri

Ma semiconductor epitaxy processes ndi ofunikira kwambiri ku zinyalala zachitsulo. Graphite wamba wa mafakitale ali ndi zinthu zachitsulo monga chitsulo (Fe), nickel (Ni), ndi mkuwa (Cu), zomwe zimasinthasintha mosavuta ndikufalikira mu epitaxial layer kutentha kwambiri, zomwe zimapangitsa kuti magetsi owonongeka ndi kuyenda kwa chonyamuliracho kukhale kovuta. Ma heater a graphite oyeretsedwa kwambiri amachitidwa njira zoyeretsera chlorination kutentha kwambiri, zomwe zimachepetsa kuchuluka kwa phulusa kufika pansi pa 5 ppm (ndi pansi pa 2 ppm kuti pakhale semiconductor grade yapamwamba), zomwe zimaletsa kuipitsidwa kwa ma wafer a epitaxial kuchokera ku zinyalala za thermal field zomwe zili pa gwero.

Zinthu Zapamwamba Zotenthetsera Graphite mu Semiconductor Wafer Processing

Zinthu zotenthetsera zamagetsi zimatenthedwa ndi kuzizira mofulumira nthawi zambiri kuyambira kutentha kwa chipinda mpaka madigiri Celsius masauzande ambiri. Mosiyana ndi mawaya otenthetsera achitsulo (monga tungsten kapena molybdenum), omwe nthawi zambiri amabwereranso, amasweka, kapena amagwa kutentha kwambiri, graphite imakhala ndi mawonekedwe apadera: mphamvu imawonjezeka ndi kutentha.

Mphamvu ya Makina pa Kutentha Kwambiri ndi Kukana Kutopa Kwa Kapangidwe

Mphamvu yokoka ndi yopindika ya zinthu za graphite imawonjezeka pamene kutentha kukukwera, kufika pamlingo wa pakati pa 2000°C ndi 2500°C. Khalidweli limatsimikizira kuti zotenthetsera za graphite sizimasweka kapena kusweka kwa kapangidwe kake chifukwa cha kutentha kwambiri komanso kutentha kwambiri. Chifukwa chake, kulimba kwa kukana kwa magetsi kumasungidwa nthawi yayitali yogwira ntchito, zomwe zimachepetsa kwambiri nthawi yokonza yosakonzekera.

Makina Opangidwa Mwaluso a 3D ndi Mapangidwe Ozungulira Ovuta

Ma reactor amakono a semiconductor amafuna mapangidwe ang'onoang'ono kwambiri a malo. Graphite yoyera kwambiri ili ndi makina abwino kwambiri ndipo imatha kukonzedwa kudzera mu machining a CNC a 5-axis olondola kwambiri m'magawo ovuta kwambiri—monga mapangidwe a ulusi wa magawo atatu, njira zopindika za serpentine, ndi ma circuits awiri ozungulira. Mapangidwe a geometric olondola kwambiri amenewa amakulitsa malo otenthetsera mkati mwa malo ochepa, ndikukwaniritsa kutulutsa kwamphamvu kwambiri komanso zotsatira zochepa za inductance.

Ubwino Waukulu wa Zotenthetsera za Graphite Zophimbidwa ndi SiC

Kuti mupirire malo ovuta kwambiri—monga mlengalenga wochepetsa kutentha kwa hydrogen kapena mpweya wotulutsa chlorine/fluorine—kuika Silicon Carbide layer (CVD SiC Coating) pamwamba pa graphite yoyera kwambiri kwakhala njira yabwino kwambiri yogwiritsira ntchito makampani.

Kukana Kudula kwa Hydrogen ndi Kutaya Tinthu Tonse

Pa nthawi ya SiC ndi Silicon epitaxy, kuchuluka kwa H2 m'magazi kumawonjezeka.₂Mpweya umaboola kwambiri graphite yosaphimbidwa pa kutentha kwambiri (hydrogen etching imapanga mpweya wa methane), zomwe zimapangitsa kuti pamwamba pa graphite pakhale kumasuka, kusweka mosavuta, ndikupanga kuipitsidwa kwa tinthu tating'onoting'ono. Chophimba cha CVD SiC cholimba 100% chimatseka ma pores ang'onoang'ono pamwamba pa graphite, ndikuchotsa kwathunthu kukokoloka kwa mpweya ndikupanga malo oyera kwambiri osataya tinthu tating'onoting'ono.

Kulimba mu Aggressive Media ndi Kuchepetsa Mtengo Wonse wa Eni ake (TCO)

Mu malo omwe mpweya wochita zinthu umakhudzidwa kwambiri ndi zinthu monga HCl ndi NH₃, Zophimba za CVD SiC zimawonetsa kusagwira bwino ntchito kwa mankhwala. Sikuti zimangoteteza gawo la graphite ku dzimbiri komanso zimawonjezera nthawi yosinthira zinthu zotenthetsera (nthawi zambiri zimawonjezera moyo wa ntchito ndi 200%). Izi zimachepetsa kwambiri Total Cost of Ownership (TCO) ya semiconductor fab ndi mtengo wochepetsedwa pa wafer iliyonse.

Phunziro la Nkhani: Kuthetsa Kufanana kwa Kutentha ndi Kuipitsidwa kwa Tinthu mu SiC Epitaxy

Mfundo Zokhudza Kupweteka kwa Makasitomala:Kampani yotchuka ya semiconductor epitaxy ya m'badwo wachitatu ku Germany idakumana ndi zovuta ziwiri zazikulu panthawi ya kukula kwa epitaxial ya SiC ya mainchesi 6 (kutentha kwa njira 1650°C, H2O3).₂+ TCS atmosphere): Choyamba, kusiyana kwa makulidwe a epitaxial layer m'mphepete mwa wafer kunafika mpaka ±3.8%, zomwe zinapangitsa kuti chipangizo cha m'mphepete chilephereke. Chachiwiri, chotenthetsera choyambirira cha OEM graphite chinawonetsa kuuma kwakukulu kwa hydrogen pamwamba ndi kuphulika pambuyo pa maola 120 okha ogwiritsidwa ntchito, zomwe zinapangitsa kuti tinthu tating'onoting'ono tiyambe kugwa m'chipinda chochitirapo kanthu—kupitirira malire a chilema cha khalidwe ndi 3× pa avareji.

Kuzindikira Mphamvu ya VET & Yankho Lapadera

Pambuyo pochita nawo kafukufuku, gulu la akatswiri opanga magetsi la VET Energy linachita zoyeserera zolumikizana ndi magetsi ndi madzi pa chotenthetsera choyambirira cha OEM. Kuzindikira kumeneku kunawonetsa kuti mphamvu yotenthetsera sinali yokwanira m'mphepete ndi ming'alu ya micro-pores/thermal stress mu SiC coating pamwamba (kukhuthala kwa coating kunali 60μm yokha yokhala ndi kulimba kofooka). Poyankha, VET Energy inapereka yankho laukadaulo lolunjika:

• Kukonza Kapangidwe ka Matenthedwe:Ndinakhazikitsa kapangidwe kake kodziyimira pawokha ka magawo atatu, kuchepetsa gawo lotenthetsera ndi 8% pafupi ndi madera otayira magetsi kuti ndiwonjezere kuchuluka kwa mphamvu m'deralo.
• Kukweza kwa Substrate Yoyera Kwambiri:Graphite yosankhidwa ya isostatic isostatic yokhala ndi kuchuluka kwa phulusa <2 ppm, yofanana bwino ndi coefficient of thermal expansion (CTE) ndi SiC coating (CTE matching >98%).
• Kusintha kwa Njira ya CVD SiC:Ndinagwiritsa ntchito njira yowonjezera yoperekera CVD, ndikuwonjezera makulidwe a pamwamba pa SiC mpaka 150 ± 10 μm ndi kapangidwe ka tirigu wokhuthala, wopanda maenje omwe amatha kupirira 1700°CH₂kutsuka.

Zotsatira za Kukhazikitsa & Kufunika kwa Makasitomala Kuperekedwa

Pambuyo pa masiku 30 otsatizana a kutsimikizira mzere wopanga, kasitomala adanenanso kuti magwiridwe antchito ake asintha kwambiri: kufanana kwa makulidwe a epitaxial a full-wafer (kuphatikiza 3mm m'mphepete mwa 3mm) kwakula kwambiri kuchokera ku±3.8% mpaka ±0.8%chotenthetseracho chinkagwira ntchito mosalekeza kwamaola opitilira 400popanda kusweka kwa chophimba kapena kufalikira kwa pamwamba; zolakwika za tinthu tating'onoting'ono ta chipinda chimodzi (> 0.5μm) zinaliyachepetsedwa ndi 85%Izi zinapangitsa kuti phindu la prime chip pa wafer iliyonse liwonjezeke ndi 12% ndipo zinachepetsa ndalama zokonzera zida pachaka pafupifupi€85,000.

Mafunso Ofunsidwa Kawirikawiri