Cov yam ntxwv ntawm Silicon Carbide

Thermal conductivity

Thermal conductivity yog ib qho kev ntsuas ntawm qhov yooj yim cua sov kis los ntawm cov khoom. Qhov no yog cov cuab yeej tseem ceeb ntawm cov khoom siv hluav taws xob, vim nws qhia txog qhov uas cov khoom muaj peev xwm ua kom cov cua sov tau zoo (tsawg tshav kub vim muaj zog ntxiv vim muaj zog tam sim no), yog li ua rau nws qhov voltage thiab tam sim no muaj peev xwm.

Lub thermal conductivity ntawm silicon yog 130 W / (m⋅K), uas yog qhov qis dua li ntawm silicon carbide (490 W / (m⋅K), tso cai rau silicon carbide semiconductors kom dissipate tshav kub zoo dua thiab tiv taus kev ua haujlwm siab dua.

Thermal expansion

Kev nthuav dav thermal yog thaum cov khoom hloov pauv cov duab lossis qhov loj me - tab sis tsis hloov theem - vim qhov hloov pauv ntawm qhov kub thiab txias, xws li los ntawm cov kua mus rau roj. Ib qho piv txwv yog siv dej kub rau hauv lub raj mis uas kaw cia kom nws o kom qhib tau yooj yim.

Silicon carbide muaj cov coefficient tsawg heev ntawm thermal expansion, uas txhais tau hais tias nws khaws nws cov duab, lub zog, thiab kev ua haujlwm zoo dua ntawm qhov kub thiab txias (thiab high voltages), uas silicon yuav ua tsis tau.

Lub zog hluav taws xob

Ob qho tseem ceeb thiab cov khoom siv semiconductor yog qhov sib txawv ntawm cov khoom siv thiab qhov siab tshaj plaws hluav taws xob lub zog.

Hauv cov khoom siv semiconductor molecule, cov khoom siv hluav taws xob txav ntawm cov kab sib txawv: thaj chaw lawv yuav tsum nyob vim tias tsis muaj lub zog lub zog ntawm cov bands. Qhov sib txawv band (los yog lub zog sib txawv) yog lub zog xav tau rau ib lub tshuab hluav taws xob los ua qhov kev hloov ntawm lub valence band mus rau qhov conduction band, tso cai rau hluav taws xob ua. Thaum cov khoom siv hluav taws xob tau txais hluav taws xob hluav taws xob thiab nkag mus rau lub xeev cov khoom siv hluav taws xob no, lawv nthuav tawm cov khoom siv hluav taws xob tshwj xeeb / tus neeg xyuas pib hybrid.

Silicon carbide semiconductors muaj peb lub zog sib txawv ntau dua li silicon-based semiconductors, uas tso cai rau lawv tuaj yeem tiv taus hluav taws xob ntau dua li silicon, cia lawv ua haujlwm ntawm qhov kub thiab txias.

Silicon carbide semiconductors muaj qhov sib txawv ntawm lub zog loj thiab tuaj yeem tiv taus thiab dissipate cua sov zoo dua li silicon-based semiconductors. Lawv kuj muaj lwm yam zoo:

Qhov sib txawv ntawm lub zog siab ntawm silicon carbide yog qhov muaj txiaj ntsig zoo hauv kev siv hluav taws xob siab vim tias qhov sib txawv ntawm lub zog siab dua tso cai rau cov khoom siv hluav taws xob me me nrog kev ua haujlwm siab dua.

Rau diodes, ib hom ntawm cov khoom siv semiconductor, qhov tawg voltage yog qhov hluav taws xob uas qhov rov qab siv tam sim no tuaj yeem ntws los ntawm diode. Lub siab tawg voltage ntawm silicon carbide ua rau nws zoo tagnrho rau MOSFETs.

Qhov no ua rau lwm qhov tseem ceeb ntawm cov khoom siv semiconductor hauv MOSFETs: lub sijhawm rov qab los. Yog tias MOSFET nkag mus rau hauv lub xeev tsis ncaj ncees lawm, lub sijhawm nws yuav siv sij hawm rov qab mus rau lub xeev qub yog lub sijhawm rov qab los. Nyob rau lub sijhawm no, qhov tam sim no tuaj yeem ntws mus rau qhov sib txawv thiab lub cev muaj zog poob. Hauv cov xwm txheej no, SiC cov cuab yeej muaj lub sijhawm rov qab nrawm heev thiab tsis muaj zog poob qis, uas tsis yog cov khoom siv Si.

Silicon carbide yog hloov tau ntau dua li silicon nyob rau hauv cov nqe lus ntawm doping (ntxiv impurities). Nws tuaj yeem raug kho kom ua hluav taws xob tsuas yog nyob rau hauv cov xwm txheej tshwj xeeb, xws li lub teeb uas dhau qhov kev siv tshwj xeeb (infrared, pom, lossis ultraviolet), uas ua rau silicon carbide semiconductors ntau yam.