Nkag Siab Txog Semi-Insulating vs. N-Type SiC Wafers Rau RF Daim Ntawv Thov

Silicon carbide (SiC) tau tshwm sim los ua ib yam khoom tseem ceeb hauv cov khoom siv hluav taws xob niaj hnub no, tshwj xeeb tshaj yog rau cov ntawv thov uas muaj zog siab, zaus siab, thiab qhov kub siab. Nws cov khoom zoo dua - xws li bandgap dav, thermal conductivity siab, thiab hluav taws xob tawg siab - ua rau SiC yog qhov kev xaiv zoo tshaj plaws rau cov khoom siv siab heev hauv cov khoom siv hluav taws xob fais fab, optoelectronics, thiab xov tooj cua zaus (RF). Ntawm ntau hom SiC wafers,semi-insulatingthiabhom nCov wafers feem ntau siv rau hauv RF systems. Kev nkag siab txog qhov sib txawv ntawm cov ntaub ntawv no yog qhov tseem ceeb rau kev ua kom zoo dua ntawm SiC-based devices.

1. Dab tsi yog Semi-Insulating thiab N-Type SiC Wafers?

Cov SiC Wafers Semi-Insulating
Cov SiC wafers semi-insulating yog ib hom SiC tshwj xeeb uas tau muab doped nrog qee yam impurities kom tiv thaiv cov neeg nqa khoom dawb los ntawm kev ntws los ntawm cov khoom siv. Qhov no ua rau muaj kev tiv thaiv siab heev, txhais tau tias cov wafer tsis yooj yim ua hluav taws xob. Cov SiC wafers semi-insulating yog qhov tseem ceeb tshwj xeeb hauv kev siv RF vim tias lawv muab kev sib cais zoo heev ntawm cov cheeb tsam khoom siv thiab lwm qhov ntawm lub kaw lus. Cov cuab yeej no txo ​​qhov kev pheej hmoo ntawm cov kab mob parasitic, yog li txhim kho lub cuab yeej ruaj khov thiab kev ua tau zoo.

N-Hom SiC Wafers
Qhov sib piv, n-hom SiC wafers yog doped nrog cov ntsiab lus (feem ntau yog nitrogen lossis phosphorus) uas pub dawb electrons rau cov khoom siv, tso cai rau nws coj hluav taws xob. Cov wafers no qhia txog qis dua resistivity piv rau semi-insulating SiC wafers. N-hom SiC feem ntau yog siv rau hauv kev tsim cov khoom siv nquag xws li field-effect transistors (FETs) vim nws txhawb nqa kev tsim ntawm ib qho conductive channel tsim nyog rau tam sim no ntws. N-hom wafers muab qib tswj hwm ntawm conductivity, ua rau lawv zoo tagnrho rau lub zog thiab kev hloov pauv daim ntawv thov hauv RF circuits.

2. Cov Khoom ntawm SiC Wafers rau RF Daim Ntawv Thov

2.1. Cov yam ntxwv ntawm cov khoom siv

• Dav BandgapOb qho tib si semi-insulating thiab n-hom SiC wafers muaj qhov dav bandgap (kwv yees li 3.26 eV rau SiC), uas ua rau lawv ua haujlwm ntawm cov zaus siab dua, cov hluav taws xob siab dua, thiab qhov kub piv rau cov khoom siv silicon. Cov cuab yeej no yog qhov tshwj xeeb tshaj yog rau cov ntawv thov RF uas xav tau kev tswj hwm lub zog siab thiab kev ruaj khov thermal.

• Kev Ua KubSiC lub thermal conductivity siab (~ 3.7 W / cm · K) yog lwm qhov zoo tseem ceeb hauv kev siv RF. Nws tso cai rau kev ua kom sov zoo, txo qhov kev ntxhov siab thermal ntawm cov khoom thiab txhim kho kev ntseeg siab thiab kev ua tau zoo hauv cov chaw muaj zog RF siab.

2.2. Kev tiv taus thiab kev coj ua

• Cov Wafer Semi-Insulating: Nrog rau qhov tsis kam feem ntau nyob rau hauv qhov ntau ntawm 10 ^ 6 txog 10 ^ 9 ohm · cm, semi-insulating SiC wafers yog qhov tseem ceeb rau kev cais cov khoom sib txawv ntawm RF systems. Lawv qhov xwm txheej tsis-conductive ua kom ntseeg tau tias muaj qhov xau tam sim no tsawg kawg nkaus, tiv thaiv kev cuam tshuam tsis xav tau thiab kev poob teeb liab hauv lub voj voog.

• N-Hom Wafers: N-hom SiC wafers, ntawm qhov tod tes, muaj cov nqi resistivity xws li 10 ^ -3 txog 10 ^ 4 ohm · cm, nyob ntawm seb cov qib doping. Cov wafers no yog qhov tseem ceeb rau cov khoom siv RF uas xav tau kev tswj hwm conductivity, xws li amplifiers thiab switches, qhov twg qhov ntws ntawm tam sim no yog qhov tsim nyog rau kev ua cov teeb liab.

3. Cov ntawv thov hauv RF Systems

3.1. Cov Amplifiers Fais Fab

Cov amplifiers fais fab raws li SiC yog lub hauv paus ntawm cov kab ke RF niaj hnub no, tshwj xeeb tshaj yog hauv kev sib txuas lus, radar, thiab kev sib txuas lus satellite. Rau cov ntawv thov amplifier fais fab, kev xaiv ntawm hom wafer - semi-insulating lossis n-hom - txiav txim siab qhov ua tau zoo, linearity, thiab suab nrov.

• SiC Semi-Insulating: Cov SiC wafers semi-insulating feem ntau siv rau hauv lub substrate rau lub amplifier lub hauv paus qauv. Lawv cov resistivity siab ua kom ntseeg tau tias cov tam sim no tsis xav tau thiab kev cuam tshuam raug txo qis, ua rau kev xa cov teeb liab huv dua thiab kev ua haujlwm zoo dua.

• N-Hom SiC: N-hom SiC wafers siv rau hauv thaj chaw nquag ntawm cov amplifiers fais fab. Lawv cov conductivity tso cai rau kev tsim cov channel tswj uas cov electrons ntws, ua rau muaj kev nthuav dav ntawm RF teeb liab. Kev sib xyaw ua ke ntawm n-hom khoom siv rau cov khoom siv nquag thiab cov khoom siv semi-insulating rau cov substrates yog qhov tshwm sim hauv cov ntawv thov RF muaj zog siab.

3.2. Cov Khoom Siv Hloov Zaus Siab

Cov SiC wafers kuj tseem siv rau hauv cov khoom siv hloov pauv zaus siab, xws li SiC FETs thiab diodes, uas yog qhov tseem ceeb rau RF lub zog amplifiers thiab transmitters. Qhov tsis tshua muaj kev tiv thaiv thiab qhov hluav taws xob tawg siab ntawm n-hom SiC wafers ua rau lawv tsim nyog rau kev siv hloov pauv siab.

3.3. Cov Khoom Siv Microwave thiab Millimeter-Wave

Cov khoom siv microwave thiab millimeter-wave uas siv SiC, suav nrog cov oscillators thiab mixers, tau txais txiaj ntsig los ntawm lub peev xwm ntawm cov khoom siv los tswj lub zog siab ntawm cov zaus siab. Kev sib xyaw ua ke ntawm kev ua kom sov siab, lub peev xwm parasitic qis, thiab bandgap dav ua rau SiC zoo tagnrho rau cov khoom siv ua haujlwm hauv GHz thiab txawm tias THz.

4. Cov Zoo thiab Cov Kev Txwv

4.1. Cov txiaj ntsig ntawm Semi-Insulating SiC Wafers

• Cov Kab Mob Tsawg Kawg Nkaus: Qhov siab resistivity ntawm semi-insulating SiC wafers pab cais cov cheeb tsam ntaus ntawv, txo qhov kev pheej hmoo ntawm cov kab mob parasitic uas tuaj yeem ua rau kev ua haujlwm ntawm RF systems poob qis.

• Kev Txhim Kho Lub Teeb Liab Zoo DuaCov wafer SiC semi-insulating ua kom muaj kev ncaj ncees ntawm cov teeb liab los ntawm kev tiv thaiv cov kev hluav taws xob tsis xav tau, ua rau lawv zoo tagnrho rau cov ntawv thov RF zaus siab.

4.2. Cov txiaj ntsig ntawm N-Hom SiC Wafers

• Kev Tswj Xyuas Kev Coj UaN-hom SiC wafers muab qib conductivity zoo thiab hloov kho tau, ua rau lawv haum rau cov khoom siv nquag xws li transistors thiab diodes.

• Kev Tswj Xyuas Hluav Taws Xob SiabN-hom SiC wafers zoo heev hauv kev siv hluav taws xob hloov pauv, tiv taus cov hluav taws xob siab dua thiab cov hluav taws xob tam sim no piv rau cov ntaub ntawv semiconductor ib txwm muaj xws li silicon.

4.3. Kev Txwv

• Kev Ua Haujlwm NyuajKev ua cov wafer SiC, tshwj xeeb tshaj yog rau cov hom semi-insulating, tuaj yeem nyuaj dua thiab kim dua li silicon, uas yuav txwv lawv txoj kev siv hauv cov ntawv thov uas muaj nqi siab.

• Cov Khoom Siv Tsis ZooTxawm hais tias SiC paub txog nws cov khoom siv zoo heev, qhov tsis zoo hauv cov qauv wafer - xws li kev tawg lossis kev ua qias tuaj thaum lub sijhawm tsim khoom - tuaj yeem cuam tshuam rau kev ua tau zoo, tshwj xeeb tshaj yog nyob rau hauv cov ntawv thov siab thiab muaj zog.

5. Yav Tom Ntej Cov Qauv Hauv SiC Rau Cov Ntawv Thov RF

Qhov kev thov rau SiC hauv RF daim ntawv thov yuav nce ntxiv thaum cov lag luam txuas ntxiv thawb cov kev txwv ntawm lub zog, zaus, thiab kub hauv cov khoom siv. Nrog rau kev nce qib hauv cov thev naus laus zis ua wafer thiab cov txheej txheem doping zoo dua, ob qho tib si semi-insulating thiab n-hom SiC wafers yuav ua lub luag haujlwm tseem ceeb hauv cov kab ke RF tiam tom ntej.

• Cov Khoom Siv Sib Koom Ua KeKev tshawb fawb tseem tab tom ua mus rau hauv kev sib koom ua ke ob qho tib si semi-insulating thiab n-hom SiC cov ntaub ntawv rau hauv ib qho qauv cuab yeej. Qhov no yuav ua ke cov txiaj ntsig ntawm kev ua haujlwm siab rau cov khoom siv nquag nrog cov khoom cais tawm ntawm cov ntaub ntawv semi-insulating, tej zaum yuav ua rau muaj cov voj voog RF compact thiab ua haujlwm tau zoo dua.

• Cov Ntawv Thov RF Zaus Siab DuaThaum cov kab ke RF hloov zuj zus mus rau qhov zaus siab dua, qhov xav tau cov ntaub ntawv uas muaj kev tswj hwm lub zog ntau dua thiab kev ruaj khov thermal yuav loj hlob tuaj. SiC qhov bandgap dav thiab kev ua tau zoo thermal conductivity ua rau nws zoo rau kev siv hauv cov khoom siv microwave thiab millimeter-wave tiam tom ntej.

6. Xaus lus

Ob qho tib si semi-insulating thiab n-hom SiC wafers muaj cov txiaj ntsig tshwj xeeb rau kev siv RF. Semi-insulating wafers muab kev rho tawm thiab txo cov kab mob parasitic, ua rau lawv zoo tagnrho rau kev siv substrate hauv RF systems. Qhov sib piv, n-hom wafers yog qhov tseem ceeb rau cov khoom siv nquag uas xav tau kev tswj hwm conductivity. Ua ke, cov ntaub ntawv no ua rau muaj kev txhim kho ntawm cov khoom siv RF ua haujlwm tau zoo dua, ua haujlwm tau zoo dua uas tuaj yeem ua haujlwm ntawm cov qib fais fab siab dua, zaus, thiab kub dua li cov khoom siv silicon ib txwm muaj. Raws li qhov kev thov rau cov txheej txheem RF siab heev txuas ntxiv mus, SiC lub luag haujlwm hauv daim teb no tsuas yog yuav tseem ceeb dua.