Chifukwa Chake Ma Wafers a SiC Oyera Kwambiri Ndi Ofunika Kwambiri pa Zamagetsi Zamagetsi Zam'badwo Wotsatira

1. Kuchokera ku Silicon kupita ku Silicon Carbide: Kusintha kwa Paradigm mu Power Electronics

Kwa zaka zoposa makumi asanu, silicon yakhala maziko a zamagetsi zamagetsi. Komabe, pamene magalimoto amagetsi, makina obwezeretsanso mphamvu, malo osungira deta a AI, ndi nsanja zoyendera ndege zikukankhira ku ma voltage okwera, kutentha kwakukulu, ndi kuchuluka kwa mphamvu, silicon ikuyandikira malire ake oyambira.

Silicon carbide (SiC), semiconductor ya bandgap yotakata yokhala ndi bandgap ya ~3.26 eV (4H-SiC), yakhala yankho la zinthu m'malo mwa njira yothetsera vuto la dera. Komabe, ubwino weniweni wa zipangizo za SiC sumadalira kokha zinthuzo, koma ndi kuyera kwaSiC waferzipangizo zomwe zimamangidwapo.

Mu zamagetsi zamagetsi za m'badwo wotsatira, ma wafer a SiC oyera kwambiri si apamwamba—ndi ofunikira kwambiri.

2. Kodi “Kuyera Kwambiri” Kumatanthauza Chiyani mu SiC Wafers?

Ponena za ma wafer a SiC, kuyera kumapitirira pamlingo wa mankhwala. Ndi gawo la zinthu zambiri, kuphatikizapo:

• Kuchuluka kwa mankhwala osakonzekera mwangozi kwambiri

• Kuletsa zinyalala zachitsulo (Fe, Ni, V, Ti)

• Kuwongolera zolakwika zamkati mwa mfundo (malo opanda anthu, malo oletsa kufalikira kwa matenda)

• Kuchepetsa zolakwika za kristalographic

Ngakhale zinyalala zotsalira pamlingo wa magawo pa biliyoni (ppb) zimatha kuyambitsa mphamvu zambiri mu bandgap, zomwe zimagwira ntchito ngati mipanda yonyamulira kapena njira zotulutsira madzi. Mosiyana ndi silicon, komwe kulekerera zinyalala kumakhala kokhululuka pang'ono, bandgap yayikulu ya SiC imakulitsa mphamvu zamagetsi za cholakwika chilichonse.

3. Kuyera Kwambiri ndi Fiziki ya Kugwira Ntchito kwa Voltage Yaikulu

Ubwino waukulu wa zipangizo zamagetsi za SiC uli mu kuthekera kwawo kupirira magetsi amphamvu kwambiri—mpaka kuwirikiza kakhumi kuposa silicon. Mphamvu imeneyi imadalira kwambiri kugawa magetsi mofanana, komwe kumafunikira:

• Kukana kofanana kwambiri

• Nthawi yokhazikika komanso yodziwikiratu yonyamula katundu

• Kuchuluka kochepa kwa msampha wozama kwambiri

Zodetsa zimasokoneza mgwirizanowu. Zimasokoneza mphamvu yamagetsi m'deralo, zomwe zimapangitsa kuti:

• Kuwonongeka msanga

• Kuchuluka kwa mphamvu yotayira

• Kudalirika kwa mphamvu yoletsa kutsika

Mu zipangizo zamagetsi amphamvu kwambiri (≥1200 V, ≥1700 V), kulephera kwa chipangizo nthawi zambiri kumachokera ku vuto limodzi loipa lomwe limabwera chifukwa cha kusayera, osati chifukwa cha khalidwe lapakati la chipangizocho.

4. Kukhazikika kwa Kutentha: Kuyera ngati Sinki Yosaoneka ya Kutentha

SiC imadziwika chifukwa cha kutentha kwake kwakukulu komanso kuthekera kwake kugwira ntchito pamwamba pa 200 °C. Komabe, zinthu zodetsedwa zimagwira ntchito ngati malo ogawa ma phonon, zomwe zimapangitsa kuti kutentha kuchepe pang'onopang'ono.

Ma wafer a SiC oyera kwambiri amathandiza:

• Kutentha kotsika kwa malo olumikizirana mphamvu zomwezo

• Kuchepetsa chiopsezo cha kutentha

• Moyo wautali wa chipangizocho pansi pa kutentha kwanthawi yayitali

Mwachidule, izi zikutanthauza makina oziziritsira ang'onoang'ono, ma module amphamvu opepuka, komanso magwiridwe antchito apamwamba kwambiri—ziwerengero zofunika kwambiri mu ma EV ndi zamagetsi amlengalenga.

5. Kuyera Kwambiri ndi Kupereka Zipangizo: Zachuma pa Zolakwika

Pamene kupanga SiC kukupita ku ma wafer a mainchesi 8 ndipo pamapeto pake mainchesi 12, kuchuluka kwa zolakwika kumawonjezeka mosalunjika ndi malo a wafer. Munthawi imeneyi, chiyero chimakhala chosinthika pazachuma, osati chaukadaulo chokha.

Ma wafers oyera kwambiri amapereka:

• Kufanana kwakukulu kwa zigawo za epitaxial

• Ubwino wa mawonekedwe a MOS

• Kuchuluka kwa chipangizo pa wafer imodzi

Kwa opanga, izi zikutanthauza kuti mtengo wamagetsi pa ampere iliyonse uchepa, zomwe zimapangitsa kuti SiC iyambe kugwiritsa ntchito zinthu zomwe zimawononga ndalama zambiri monga ma charger omwe ali m'galimoto ndi ma inverter a mafakitale.

6. Kuyambitsa Mafunde Otsatira: Kupitilira Zipangizo Zamagetsi Zachizolowezi

Ma wafer a SiC oyeretsedwa kwambiri si ofunikira kokha pa ma MOSFET amakono ndi ma Schottky diode. Ndiwo maziko ofunikira pa zomangamanga zamtsogolo, kuphatikizapo:

• Zophulika za dera zolimba kwambiri mwachangu kwambiri

• Ma IC amphamvu kwambiri a malo osungira deta a AI

• Zipangizo zamagetsi zolimba ngati radiation zogwiritsira ntchito maulendo amlengalenga

• Kuphatikiza kwa mphamvu ndi ntchito zozindikira za monolithic

Mapulogalamuwa amafuna kudziwikiratu bwino zinthu, komwe kuyera ndiye maziko omwe fizikisi ya zida zapamwamba ingapangidwe modalirika.

7. Mapeto: Chiyero monga Njira Yogwiritsira Ntchito Ukadaulo Wanzeru

Mu zamagetsi zamagetsi za m'badwo wotsatira, kupindula kwa magwiridwe antchito sikuchokeranso makamaka ku kapangidwe kabwino ka ma circuit. Amayambira pamlingo wozama kwambiri—pa kapangidwe ka atomu ka wafer yokha.

Ma wafer a SiC oyera kwambiri amasintha silicon carbide kuchokera ku chinthu chabwino kukhala nsanja yotheka kukula, yodalirika, komanso yothandiza kwambiri padziko lonse lapansi lamagetsi. Pamene kuchuluka kwa magetsi kukukwera, kukula kwa makina kumachepa, ndipo zolinga zogwira ntchito bwino zimakula, chiyero chimakhala chizindikiro cha kupambana.

Mwanjira imeneyi, ma wafer a SiC oyera kwambiri si zigawo zokha—ndi zomangamanga zamtsogolo zamagetsi zamagetsi.