Lub ntsiab lus ntawm TOPCon roj teeb yog dab tsi?
Lub npe tag nrho ntawm TOPCon yog Tunnel Oxide Passivating Contacts, uas txhais tau tias Tunneling Oxide Passivated Contacts, ib qho thev naus laus zis N-hom silicon wafer cell uas tau tsim tsa xyoo 2013. TOPCon cells, piv txwv li Tunneling Oxide Passivated Contacts lub hnub ci cells, yog tsim los txhim kho kev ua haujlwm ntawm lub hnub ci cell los ntawm kev daws teeb meem ntawm kev xaiv passivation ntawm cov neeg nqa khoom hauv lub cell.
TOPCon cell pem hauv ntej thiab cov qauv N-hom hnub ci cell ib txwm muaj tib yam, qhov sib txawv tseem ceeb hauv qab ntawm lub cell los npaj ib txheej ntawm ultra-thin silicon oxide, thiab tom qab ntawd ib txheej nyias ntawm doped silicon deposition, ob qho ua ke tsim cov qauv sib cuag passivated, zoo txo cov khoom sib xyaw ntawm qhov chaw thiab cov hlau sib cuag sib xyaw.
Vim yog qhov zoo ntawm cov nyhuv passivation ntawm ultra-thin silicon oxide thiab cov yeeb yaj kiab silicon uas muaj cov tshuaj doped ntau ua rau cov zog ntawm cov silicon wafer tsim cov khoov, yog li tsim cov nyhuv passivation teb, qhov muaj feem ntawm electron tunneling nce ntxiv dramatically, qhov kev tiv thaiv kev sib cuag txo qis, thiab thaum kawg txhim kho kev hloov pauv zoo.
Vim li cas TOPCon thiaj hloov cov thev naus laus zis PERC?
Xyoo 2023, kev lag luam PV tau pom ib qho kev tawg tseem ceeb nrog kev ntxiv ntau dua 400GW ntawm TOPCon lub peev xwm tsim khoom tshiab. nws xav tias TOPCon cell technology yuav dhau PERC ib txwm muaj los ua cov thev naus laus zis tshiab los ntawm xyoo 2024. Hauv kev tsim khoom, nws xav tias TOPCon kev tsim khoom yuav ncav cuag li 100GW xyoo no, suav txog 20% -30% ntawm tag nrho cov PV cell tsim khoom. Raws li txoj kev N-hom cell uas pheej yig tshaj plaws, TOPCon cells raug suav hais tias yog cov khoom zoo thiab tsis tshua muaj peev xwm tsim khoom, thiab qhov xwm txheej ntawm kev muab khoom ntau dua li qhov xav tau yuav nyob thoob plaws hauv ib xyoos. Nrog rau kev txhim kho tas mus li ntawm TOPCon roj teeb ua haujlwm zoo, N-hom TOPCon roj teeb qhov chaw zoo tshaj plaws yuav nthuav dav ntxiv, uas yuav muaj kev cuam tshuam zoo rau kev lag luam ntawm cov tuam txhab cuam tshuam.
Lub roj teeb N-hom tseem tsis tau paub txog qhov teeb meem tseem ceeb ntawm kev nthuav dav ntawm kev tsim khoom loj yog tias nws cov kev ua haujlwm zoo thiab P-hom roj teeb tsis tau qhib qhov sib txawv tseem ceeb ntawm tus nqi tsis yog silicon ntawm 30% -40% siab dua li lub roj teeb PERC. Kev ua haujlwm ntawm lub roj teeb PERC tau ze rau lub qab nthab, qhov chaw kom txo tus nqi ntawm qhov chaw tau txwv, tab sis kev ua haujlwm ntawm lub roj teeb TOPCon kom txhim kho tseem muaj peev xwm zoo. Raws li PV Infolink cov ntaub ntawv, tus nqi tsis yog silicon tam sim no ntawm TOPCon cells yog ze rau $ 0.3 ib watt, piv rau tus nqi ntawm cov cell PERC loj ntawm $ 0.21-0.23 ib watt, thiab tseem muaj qhov sib txawv. Txawm li cas los xij, nrog rau kev siv zog tom qab, tus nqi tsim khoom ntawm TOPCon cells yuav maj mam mus txog qib ntawm PERC cells.
Cov txiaj ntsig ntawm TOPCon roj teeb yog dab tsi?
1. Qhov zoo ntawm kev passivation: qhov kev ua tau zoo ntawm qhov chaw passivation feem ntau nyob ntawm cov tshuaj passivation thiab thaj teb passivation, kev loj hlob thermal ntawm SiO2 muaj peev xwm zoo heev rau kev passivation tshuaj. Kev doping hnyav hauv polysilicon tuaj yeem ua rau lub zog ntawm silicon khoov, ua rau kev sib sau ua ke ntawm cov neeg nqa khoom feem ntau thiab kev poob qis ntawm cov neeg nqa khoom tsawg ntawm qhov sib txuas, txo cov khoom sib xyaw thiab ua lub luag haujlwm ntawm thaj teb passivation.
2. Qhov zoo ntawm cov hlau sib txuas ua ke: cov hlau sib txuas ua ke ua rau lub qhov rooj tsis ua haujlwm zoo ntawm cov qauv hnub ci. Kev lag luam ntawm metallization feem ntau yog kev luam ntawv tom qab kub siab sintering, cov txheej txheem kub siab sintering hlau nplaum yuav "etch" poly-Si los ua "puncture" (Spiking), rhuav tshem qhov passivation ntawm cov qauv sib cuag, ua rau thaj chaw sib cuag hlau ntawm J0c siab dua hauv thaj chaw sib cuag hlau dua li thaj chaw passivated. Tab sis p + poly thiab n + poly hlau sib txuas ua ke, txawm tias "puncture" yuav rhuav tshem cov qauv sib cuag passivation ntawm lub rooj plaub tuaj yeem ua rau cov hlau sib txuas qis dua li cov emitter / rov qab teb ib txwm muaj.
3. Qhov zoo ntawm kev sib cuag hlau resistivity: ntxiv rau kev sib cuag hlau sib xyaw, kev sib cuag hlau-semiconductor resistivity (ρc) kuj tseem ceeb rau kev ua haujlwm ntawm cov khoom siv crystalline silicon hnub ci hlwb, hlau-semiconductor los tsim kom muaj kev sib cuag ohmic zoo los pab txo qhov kev poob tsis kam thiab txhim kho qhov sau.
