Ukuqonda iiWafers zeSiC zeSemi-Insulation vs. N-Type kwizicelo zeRF

I-silicon carbide (i-SiC) ivele njengesixhobo esibalulekileyo kwi-elektroniki yanamhlanje, ngakumbi kwizicelo ezibandakanya amandla aphezulu, amaza aphezulu, kunye neendawo ezinobushushu obuphezulu. Iimpawu zayo eziphezulu—ezifana ne-wide bandgap, i-thermal conductivity ephezulu, kunye ne-high breakdown voltage—zenza i-SiC ibe lukhetho olufanelekileyo kwizixhobo eziphambili kwizicelo ze-elektroniki zamandla, i-optoelectronics, kunye ne-radio frequency (RF). Phakathi kweentlobo ezahlukeneyo ze-SiC wafers,ukuvala okuncincikwayeuhlobo lwe-nIi-wafers zisetyenziswa kakhulu kwiinkqubo ze-RF. Ukuqonda umahluko phakathi kwezi zinto kubalulekile ekwenzeni ngcono ukusebenza kwezixhobo ezisekwe kwi-SiC.

1. Zithini iiWafers zeSiC eziNcinci kunye neziN-Type?

IiWafers zeSiC eziNciphisa ubushushu obuphantsi
Ii-wafer ze-SiC ezifakwa ubushushu obuphantsi luhlobo oluthile lwe-SiC oluye lwaxutywa ngabom ngokungcola okuthile ukuthintela ukuba ii-free carriers zingahambi ngaphakathi kwezinto. Oku kubangela ukuba i-wafer ingabi lula ukuhambisa umbane. Ii-wafer ze-SiC ezifakwa ubushushu obuphantsi zibaluleke kakhulu kwizicelo ze-RF kuba zibonelela ngokwahlukana okuhle phakathi kweendawo zesixhobo esisebenzayo kunye nenkqubo yonke. Olu phawu lunciphisa umngcipheko we-parasitic currents, ngaloo ndlela luphucula uzinzo kunye nokusebenza kwesixhobo.

IiWafers zeSiC zohlobo lwe-N
Ngokwahlukileyo koko, ii-wafers ze-n-type SiC zizaliswe zizinto (eziqhelekileyo yi-nitrogen okanye i-phosphorus) ezinikela ngee-electron zasimahla kwinto leyo, nto leyo evumela ukuba ziqhube umbane. Ezi wafers zibonisa ukumelana okuphantsi xa kuthelekiswa nee-wafers ze-SiC ezi-semi-insulating. I-N-type SiC isetyenziswa kakhulu ekwenzeni izixhobo ezisebenzayo ezifana nee-transistors ze-field-effect (ii-FET) kuba ixhasa ukwakheka kwetshaneli eqhubayo efunekayo ekuhambeni kwamandla. Ii-wafers ze-N-type zibonelela ngenqanaba elilawulwayo le-conductivity, nto leyo ezenza zilungele ukusetyenziswa kwamandla kunye nokutshintsha kwiisekethe ze-RF.

2. Iipropati zeeSiC Wafers zezicelo zeRF

2.1. Iimpawu zezinto eziphathekayo

• I-Bandgap ebanzi: Zombini ii-wafers ze-SiC ezisebenzisa i-semi-insulation kunye ne-n-type zine-bandgap ebanzi (malunga ne-3.26 eV ye-SiC), evumela ukuba zisebenze kwiifrequencies eziphezulu, ii-voltages eziphezulu, kunye namaqondo obushushu xa kuthelekiswa nezixhobo ezisekelwe kwi-silicon. Le propati iluncedo ngakumbi kwizicelo ze-RF ezifuna ukuphathwa kwamandla aphezulu kunye nokuzinza kobushushu.

• Ukuqhuba kweThermal: Ukuqhuba okuphezulu kobushushu beSiC (~3.7 W/cm·K) yenye inzuzo ephambili kwizicelo zeRF. Ivumela ukusasazwa kobushushu okusebenzayo, ukunciphisa uxinzelelo lobushushu kwiindawo kunye nokuphucula ukuthembeka kunye nokusebenza ngokubanzi kwiindawo zeRF ezinamandla aphezulu.

2.2. Ukuxhathisa kunye nokuqhuba

• IiWafers eziNciphisa Ubushushu: Njengoko i-resistivity ihlala iphakathi kwe-10^6 ukuya kwi-10^9 ohm·cm, ii-SiC wafers ezithintela ubushushu obuphantsi zibalulekile ekuhlukaniseni iindawo ezahlukeneyo zeenkqubo ze-RF. Indalo yazo yokungaqhubi iqinisekisa ukuba kukho ukuvuza okuncinci kwamandla, okuthintela ukuphazamiseka okungafunekiyo kunye nokulahleka kwesignali kwisekethe.

• IiWafers zohlobo lwe-N: Ii-wafers ze-SiC zohlobo lwe-N, kwelinye icala, zinexabiso lokumelana ukusuka kwi-10^-3 ukuya kwi-10^4 ohm·cm, kuxhomekeke kumanqanaba e-doping. Ezi wafers zibalulekile kwizixhobo ze-RF ezifuna ukuhanjiswa kwamandla ombane okulawulwayo, njengee-amplifier kunye neeswitshi, apho ukuhamba kombane kuyimfuneko ukuze kuqhutywe isignali.

3. Izicelo kwiiNkqubo zeRF

3.1. Ii-Amplifiers zamandla

Ii-amplifiers zamandla ezisekelwe kwi-SiC zisisiseko seenkqubo ze-RF zanamhlanje, ngakumbi kunxibelelwano lwefowuni, i-radar, kunye nonxibelelwano lwesathelayithi. Kwizicelo ze-amplifiers zamandla, ukhetho lohlobo lwe-wafer—i-semi-insulating okanye i-n-type—lugqiba ukusebenza kakuhle, ulungelelwano, kunye nokusebenza kwengxolo.

• I-SiC ekhusela kancinci: Ii-wafer ze-SiC ezizi-semi-insulating zihlala zisetyenziswa kwi-substrate yesakhiwo sesiseko se-amplifier. Ukumelana kwazo okuphezulu kuqinisekisa ukuba imisinga engafunekiyo kunye nokuphazamiseka kuyancitshiswa, nto leyo ekhokelela ekuhanjisweni kwesignali okucocekileyo kunye nokusebenza kakuhle okuphezulu.

• I-N-Type SiC: Ii-wafers ze-N-type SiC zisetyenziswa kwindawo esebenzayo yee-amplifiers zamandla. Ukuqhuba kwazo kuvumela ukudalwa kwetshaneli elawulwayo apho ii-electron zihamba khona, okuvumela ukwanda kwemiqondiso ye-RF. Ukudibanisa izinto ze-n-type kwizixhobo ezisebenzayo kunye nezinto ezithintela ubushushu obuphantsi kwi-substrates kuqhelekile kwizicelo ze-RF ezinamandla aphezulu.

3.2. Izixhobo zokutshintsha ezisetyenziswa rhoqo

Ii-wafer zeSiC zikwasetyenziswa kwizixhobo zokutshintsha ii-frequency eziphezulu, ezifana nee-SiC FET kunye nee-diode, ezibalulekileyo kwi-RF power amplifiers kunye nee-transmitters. Uxinzelelo oluphantsi kunye ne-voltage ephezulu ye-n-type SiC wafers zizenza zifaneleke ngokukodwa kwizicelo zokutshintsha ezisebenza kakuhle.

3.3. Izixhobo zeMicrowave kunye neMillimeter-Wave

Izixhobo ze-microwave kunye ne-millimeter-wave ezisekelwe kwi-SiC, kuquka ii-oscillators kunye nee-mixers, ziyazuza kubuchule bezixhobo zokulawula amandla aphezulu kwiifrikhwensi eziphakamileyo. Ukudibanisa umbane ophezulu, amandla aphantsi e-parasitic, kunye ne-wide bandgap kwenza i-SiC ifaneleke kwizixhobo ezisebenza kwi-GHz kunye ne-THZ.

4. Iingenelo kunye nokunqongophala

4.1. Iingenelo zeeWafers zeSiC eziNciphisa Ubushushu obuphantsi

• Imisinga emincinci yeParasitic: Ukumelana okuphezulu kwee-wafers ze-SiC ezithintela ubushushu obuphantsi kunceda ukwahlula iindawo zesixhobo, kunciphisa umngcipheko we-parasitic currents enokonakalisa ukusebenza kweenkqubo ze-RF.

• Ukuphuculwa koBulungisa beSignali: Ii-wafer ze-SiC ezithintela ubushushu obuphantsi ziqinisekisa ukuthembeka kwesignali ephezulu ngokuthintela iindlela zombane ezingafunekiyo, nto leyo ezenza zilungele ukusetyenziswa kwe-RF rhoqo.

4.2. Iingenelo zeeWafers zeSiC zohlobo lwe-N

• Ulawulo lokuqhuba oluLawulwayo: Ii-wafers ze-SiC zohlobo lwe-N zibonelela ngenqanaba elichaziweyo nelihlengahlengiswayo lokuqhuba, nto leyo ezenza zifaneleke kwizinto ezisebenzayo ezifana nee-transistors kunye nee-diode.

• Ukuphatha Amandla Aphezulu: Ii-wafers ze-SiC zohlobo lwe-N zigqwesile kwizicelo zokutshintsha umbane, zinyamezela ii-voltages eziphezulu kunye nemisinga xa kuthelekiswa nezixhobo ze-semiconductor zemveli ezifana ne-silicon.

4.3. Imida

• Ubunzima bokucubungula: Ukucubungula i-SiC wafer, ingakumbi kwiintlobo ze-semi-insulation, kunokuba nzima kwaye kubize kakhulu kune-silicon, nto leyo enokunciphisa ukusetyenziswa kwayo kwizicelo ezinobunzima.

• Iziphene zezinto eziphathekayo: Nangona i-SiC yaziwa ngeempawu zayo ezintle zezinto, iziphene kwisakhiwo se-wafer—ezifana nokudilika okanye ukungcola ngexesha lokwenziwa—zinokuchaphazela ukusebenza, ingakumbi kwizicelo ezisetyenziswa rhoqo kakhulu nezisebenzisa amandla aphezulu.

5. Iindlela zexesha elizayo kwiSiC kwizicelo zeRF

Imfuno yeSiC kwizicelo zeRF kulindeleke ukuba inyuke njengoko amashishini eqhubeka nokunciphisa imida yamandla, amaza, kunye nobushushu kwizixhobo. Ngokuphucuka kobuchwepheshe bokucubungula iiwafer kunye neendlela eziphuculweyo zokusebenzisa idoping, zombini iiwafer zeSiC ezisetyenziswa kwi-semi-insulation kunye ne-n-type ziya kudlala indima ebaluleke kakhulu kwiinkqubo zeRF zesizukulwana esilandelayo.

• Izixhobo eziDibeneyo: Uphando luyaqhubeka malunga nokudibanisa zombini izixhobo ze-SiC ezithintela ubushushu obuphantsi kunye ne-n-type kwisakhiwo sesixhobo esinye. Oku kuya kudibanisa iingenelo zokuqhuba okuphezulu kwezinto ezisebenzayo kunye neempawu zokwahlula izinto ezithintela ubushushu obuphantsi, okunokubangela ukuba kubekho iisekethe ze-RF ezincinci nezisebenzayo.

• Izicelo zeRF eziQhelekileyo eziphezuluNjengoko iinkqubo ze-RF zitshintsha ziye kumaza aphezulu nangakumbi, imfuneko yezinto ezisebenzisa amandla amakhulu kunye nozinzo lobushushu iya kukhula. I-bandgap ebanzi ye-SiC kunye nokuqhuba kakuhle kobushushu kuyibeka kakuhle ukuze isetyenziswe kwizixhobo ze-microwave kunye namaza e-millimeter zesizukulwana esilandelayo.

6. Isiphelo

Ii-wafer ze-SiC ezizi-semi-insulation kunye ne-n-type zombini zibonelela ngeenzuzo ezikhethekileyo kwizicelo ze-RF. Ii-wafer ezizi-semi-insulation zibonelela ngokwahlulwa kunye ne-parasitic currents encitshisiweyo, nto leyo ezenza zibe zilungele ukusetyenziswa kwe-substrate kwiinkqubo ze-RF. Ngokwahlukileyo koko, ii-wafer ze-n-type zibalulekile kwizixhobo ezisebenzayo ezifuna ukulawulwa kokuqhuba. Zidibene, ezi zixhobo zivumela ukuphuhliswa kwezixhobo ze-RF ezisebenzayo nezisebenza kakuhle ezinokusebenza kumanqanaba aphezulu amandla, amaza, kunye namaqondo obushushu kunezixhobo zemveli ezisekelwe kwi-silicon. Njengoko imfuno yeenkqubo ze-RF eziphambili iqhubeka ikhula, indima ye-SiC kweli candelo iya kuba nkulu ngakumbi.