Ma Substrates a Semiconductor ndi Epitaxy: Maziko Aukadaulo Omwe Ali M'mbuyo mwa Mphamvu Zamakono ndi Zipangizo za RF

Kupita patsogolo kwa ukadaulo wa semiconductor kumafotokozedwa kwambiri ndi kupita patsogolo m'magawo awiri ofunikira:magawondizigawo za epitaxialZigawo ziwirizi zimagwirira ntchito limodzi kuti zitsimikizire magwiridwe antchito amagetsi, kutentha, ndi kudalirika kwa zida zapamwamba zomwe zimagwiritsidwa ntchito m'magalimoto amagetsi, malo oyambira a 5G, zamagetsi zamagetsi, ndi makina olumikizirana amagetsi.

Ngakhale kuti gawo lapansi limapereka maziko enieni komanso a kristalo, gawo la epitaxial limapanga maziko ogwirira ntchito komwe machitidwe apamwamba, amphamvu kwambiri, kapena optoelectronic amapangidwa. Kugwirizana kwawo—kulinganiza kwa kristalo, kufutukuka kwa kutentha, ndi mphamvu zamagetsi—ndikofunikira popanga zipangizo zomwe zimagwira ntchito bwino kwambiri, kusintha mwachangu, komanso kusunga mphamvu zambiri.

Nkhaniyi ikufotokoza momwe ma substrates ndi ukadaulo wa epitaxial amagwirira ntchito, chifukwa chake ndi ofunikira, komanso momwe amapangira tsogolo la zipangizo za semiconductor mongaSi, GaN, GaAs, safiro, ndi SiC.

1. Kodi ndi chiyaniGawo la Semiconductor?

Chipangizo choyambira ndi "pulatifomu" ya kristalo imodzi yomwe chipangizo chimamangidwira. Chimapereka chithandizo cha kapangidwe kake, kuyeretsa kutentha, ndi template ya atomiki yofunikira pakukula kwa epitaxial kwapamwamba.

Ntchito Zofunika Kwambiri za Substrate

• Thandizo la makina:Zimaonetsetsa kuti chipangizocho chimakhala chokhazikika bwino panthawi yokonza ndi kugwiritsa ntchito.

• Chifaniziro cha kristalo:Amatsogolera gawo la epitaxial kuti likule ndi ma atomu olumikizidwa bwino, kuchepetsa zolakwika.

• Ntchito yamagetsi:Zingayendetse magetsi (monga Si, SiC) kapena kugwira ntchito ngati chotetezera kutentha (monga safiro).

Zipangizo Zodziwika Kwambiri

Momwe Ma Substrate Amapangidwira

1. Kuyeretsa zinthu:Silicon kapena zinthu zina zimayengedwa bwino kwambiri.

2. Kukula kwa kristalo imodzi:

   • Czochralski (CZ)- njira yodziwika kwambiri ya silicon.

   • Malo Oyandama (FZ)– imapanga makhiristo oyera kwambiri.

3. Kudula ndi kupukuta wafer:Maboule amadulidwa kukhala ma wafers ndipo amapukutidwa kuti akhale osalala bwino.

4. Kuyeretsa ndi kuyang'anira:Kuchotsa zinthu zodetsa ndi kuyang'ana kuchuluka kwa zolakwika.

Mavuto aukadaulo

Zipangizo zina zapamwamba—makamaka SiC—n’zovuta kupanga chifukwa cha kukula pang’onopang’ono kwa makristalo (0.3–0.5 mm/ola limodzi), kufunikira kowongolera kutentha kwambiri, komanso kutayika kwakukulu kwa kudula (kutayika kwa kerf ya SiC kumatha kufika >70%). Kuvuta kumeneku ndi chifukwa chimodzi chomwe zipangizo za m’badwo wachitatu zimakhalira zodula.

2. Kodi Chigawo cha Epitaxial N'chiyani?

Kupanga gawo la epitaxial kumatanthauza kuyika filimu yopyapyala, yoyera kwambiri, yokhala ndi kristalo imodzi pa substrate yokhala ndi mawonekedwe olunjika bwino a lattice.

Gawo la epitaxial limazindikira kuchuluka kwakhalidwe lamagetsiya chipangizo chomaliza.

Chifukwa Chake Epitaxy Ndi Yofunika

• Kumawonjezera kuyera kwa kristalo

• Imathandizira ma profiles opangidwa mwamakonda

• Amachepetsa kufalikira kwa chilema cha substrate

• Amapanga mapangidwe a heterostructures monga quantum wells, HEMTs, ndi superlattices

Main Epitaxy Technologies

Ma Parameter Ofunika Kwambiri mu Epitaxy

• Kukhuthala kwa gawo:Ma nanometer a zitsime za quantum, mpaka 100 μm pazida zamagetsi.

• Kugwiritsa ntchito mankhwala osokoneza bongo:Amasintha kuchuluka kwa zinthu zomwe zimanyamula zinthu kudzera mu kulowetsa zinyalala molondola.

• Ubwino wa mawonekedwe:Ayenera kuchepetsa kusokonezeka ndi kupsinjika chifukwa cha kusagwirizana kwa lattice.

Mavuto mu Heteroepitaxy

• Kusagwirizana kwa lattice:Mwachitsanzo, GaN ndi safiro sizikugwirizana ndi ~13%.

• Kusagwirizana kwa kutentha:Zingayambitse ming'alu panthawi yozizira.

• Kulamulira bwino zilema:Imafuna zigawo za buffer, zigawo zoyesedwa, kapena zigawo za nucleation.

3. Momwe Substrate ndi Epitaxy Zimagwirira Ntchito Pamodzi: Zitsanzo Zenizeni

GaN LED pa Sapphire

• Safira ndi yotsika mtengo komanso yoteteza kutentha.

• Zigawo za Buffer (AlN kapena GaN yotsika kutentha) zimachepetsa kusalingana kwa lattice.

• Zitsime za multi-quantum (InGaN/GaN) zimapanga dera lotulutsa kuwala.

• Imakwaniritsa kuchuluka kwa zolakwika pansi pa 10⁸ cm⁻² komanso imagwira ntchito bwino kwambiri.

SiC Power MOSFET

• Imagwiritsa ntchito ma substrates a 4H-SiC omwe ali ndi mphamvu zambiri zowononga.

• Zigawo za epitaxial drift (10–100 μm) zimazindikira kuchuluka kwa magetsi.

• Imapereka kutayika kwa conduction kotsika ~90% kuposa zida zamagetsi za silicon.

Zipangizo za GaN-on-Silicon RF

• Ma substrates a silicon amachepetsa mtengo ndipo amalola kuyanjana ndi CMOS.

• Zigawo za AlN nucleation ndi ma buffer opangidwa ndi injini amawongolera kupsinjika.

• Amagwiritsidwa ntchito pa ma chips a 5G PA omwe amagwira ntchito pafupipafupi pa ma millimeter-wave.

4. Substrate vs. Epitaxy: Kusiyana Kwakukulu

5. Kumene Maukadaulo Awa Akulowera

Kukula Kwakukulu kwa Wafer

• Si kusuntha kupita ku mainchesi 12

• SiC imasintha kuchoka pa mainchesi 6 kupita ku mainchesi 8 (kuchepetsa kwakukulu kwa mtengo)

• Kukula kwakukulu kumathandizira kuti chipangizocho chizigwira ntchito bwino komanso kumachepetsa mtengo wa chipangizocho

Heteroepitaxy Yotsika Mtengo

GaN-on-Si ndi GaN-on-saphire zikupitilirabe kutchuka ngati njira zina m'malo mwa zinthu zodula za GaN zachilengedwe.

Njira Zapamwamba Zodulira ndi Kukula

• Kuduladula kozizira kungachepetse kutayika kwa SiC kerf kuchokera pa ~75% mpaka ~50%.

• Mapangidwe abwino a ng'anjo amawonjezera kukolola ndi kufanana kwa SiC.

Kuphatikiza Ntchito za Optical, Power, ndi RF

Epitaxy imalola zitsime za quantum, ma superlattice, ndi zigawo zosweka zomwe ndizofunikira pakupanga ma photonics ophatikizika mtsogolo komanso zamagetsi zamagetsi zogwira ntchito bwino kwambiri.

Mapeto

Ma substrate ndi epitaxy amapanga maziko aukadaulo a semiconductors amakono. Substrate imakhazikitsa maziko enieni, kutentha, ndi makristalo, pomwe gawo la epitaxial limafotokoza magwiridwe antchito amagetsi omwe amathandizira magwiridwe antchito apamwamba a chipangizocho.

Pamene kufunikira kwamphamvu yayikulu, pafupipafupi kwambiri, komanso magwiridwe antchito apamwambamachitidwe—kuyambira magalimoto amagetsi mpaka malo osungira deta—ukadaulo uwu upitilizabe kusintha limodzi. Zatsopano pa kukula kwa wafer, kuwongolera zolakwika, heteroepitaxy, ndi kukula kwa kristalo zidzapanga mbadwo wotsatira wa zipangizo za semiconductor ndi zomangamanga za zida.