Tau qhov twg los: pv-manufacturing.org
Kev lag luam PV tso siab rau ntau lub tshuab hluav taws xob thiab monocrystalline silicon wafers los tsim cov hnub ci cell. Ua ke lawv sawv cev ze li 90% ntawm tag nrho cov khoom siv wafer substrate siv hauv kev lag luam. Vim yog qhov sib txawv ntawm cov lus qhia hauv tib lub wafer, alkaline etching tsis tuaj yeem siv rau kev ntxhib los mos multicrystalline silicon, vim qhov no yuav ua rau tsis sib xws texturing ntawm saum npoo li cov nplej sib txawv sib txawv ntawm tus nqi sib txawv. Monocrystalline silicon wafers nrog [100] kev taw qhia yog hom ntau tshaj ntawm monocrystalline wafer hauv kev lag luam vim tias nws tuaj yeem yooj yim textured siv alkaline etchant, piv txwv li KOH. Silicon crystallises nyob rau hauv lub pob zeb diamond cubic lattice (ob lub ntsej muag sib cuam tshuam rau lub ntsej muag nruab nrab nruab nrab cubic lattices) thiab tau piav qhia hauv daim duab 1. Kab xiav, ntsuab thiab kab liab hauv daim duab 1 sawv cev rau [100], [110] thiab [111] dav hlau, feem.
Daim duab 1Sawv cev ntawm pob zeb diamond cubic lattice ntawm silicon siv lead ua thiab sawv cev ntawm cov dav hlau sib txawv raws li qhia los ntawm kab xim.
Daim duab 1Sawv cev ntawm pob zeb diamond cubic lattice ntawm silicon siv lead ua thiab sawv cev ntawm cov dav hlau sib txawv raws li qhia los ntawm kab xim.
Alkaline etchants etch [100] silicon nto ntau nrawm dua li [111] silicon nto, uas yog lub hauv paus rau anisotropic etching txheej txheem siv los ua cov duab puab. Qhov sib txawv tseem ceeb ntawm kev pom puas etching thiab texturing yog tus lej etch. Txhawm rau nce anisotropy ntawm cov txheej txheem cov etch tus nqi yuav tsum tau qis, piv txwv li 2 µm/min lossis qis dua. Txhawm rau ua kom tiav cov lej qis dua, cov txheej txheem kub tuaj yeem qis dua thiab/lossis cov ntsiab lus ntawm etchant poob qis. Piv txwv li, ib daim ntawv qhia ntxaws uas siv KOH concentration ntawm 1-2% (piv rau 30-40% kev mloog zoo hauv qhov pom kev puas tsuaj tshem tawm) ntawm 70-80 ° C. Qhov tshwm sim yog thaj chaw muaj neeg nyob nrog cov xwm txheej xwm txheej raws lub hauv paus uas ob sab tau tsim los ntawm [111] lub dav hlau thiab lub hauv paus yog [100] lub dav hlau. Qhov no tau piav qhia hauv daim duab 2. Hauv kev muaj tiag, cov duab hauv qab tsis zoo ib yam square-based tetrahedrons nrog lub hauv paus, a, ntawm 54.74 °. Rau feem ntau cov txheej txheem texturing a yog nruab nrab ntawm 49 thiab 53 °. Qhov no yog vim tias qhov ntxeev ntawm lub hauv paus tau kos rau qhov ntev tshaj plaws.
Daim duab 2Random square pyramids ntawm lub ntsej muag silicon. Lub hauv paus ntug yog 5-6 µm.
Cov kev daws teeb meem kuj suav nrog isopropanol (lossis lwm yam khoom lag luam ntxiv). Isopropanol ua raws li cov surfactant uas ua rau cov dej ntub dej thiab ua kom ntseeg tau tias H.2roj (tso tawm los ntawm kev kos) tsis lo rau saum npoo. Yog tias isopropanol tsis siv, puag ncig "toj roob hauv pes" tuaj yeem tsim tau vim H.2npuas thaiv tus nqi ntawm qhov chaw. Isopropyl txo qhov nro saum npoo thiab tso cai rau H.2npuas kom tso tawm ntawm qhov chaw yooj yim dua.
Muaj ntau ntau yam uas ua rau kom muaj qhov zoo ntawm texturing:
Qhov tshwm sim ntawm texturing nyob ntawm qhov xub thawj.
Cov txheej txheem muaj kev nkag siab rau qhov muaj cov seem silicates los ntawm kev pom kev puas tsuaj.
Qhov sib npaug ntawm pyramid nucleation thiab kev puas tsuaj ntawm pyramid.
Kev hla ntau dhau tuaj yeem ua rau kev puas tsuaj ntawm lub hauv paus.
Kev nqus dej ntawm Isopropanol tshwm sim tom qab da dej kub txog 90 ° C.
Isopropanol muaj qhov ua kom ntub dej - nres H2 npuas los ntawm lo rau saum npoo.
Kev tso cua yog qhov tseem ceeb, tab sis tuaj yeem cuam tshuam rau isopropanol evaporation tus nqi
Lub sijhawm txheej txheem raug yog 15-20 feeb, yog li yuav tsum tau saib xyuas qhov nqus dej.
Batch ncig - npuas nrog N2tuaj yeem pab khaws cov khoom da dej sib xyaw kom zoo.
Kev kho kom raug yog qhov tseem ceeb vim tias kev ntxhib los mos yog cuam tshuam ncaj qha rau lub peev xwm ntawm lub hnub ci cell kom sau lub teeb thiab tsim hluav taws xob tam sim no. Texturing cov ntsej muag txhim kho cov xov tooj ntawm tes tam sim no los ntawm peb cov txheej txheem sib txawv.
Kev xav ntawm lub teeb ci los ntawm ib lub kaum sab xis mus rau lwm qhov txhim kho qhov tshwm sim ntawm kev nqus.
Photons cuam tshuam rau hauv silicon yuav nthuav tawm ntawm lub kaum ntse ntse, ua rau lawv txoj hauv kev zoo nyob ntev hauv lub xov tooj ntawm tes, uas ua rau nce qhov muaj feem ntawm cov tshuab hluav taws xob-qhov ua khub.
Ntev-wavelength photons cuam tshuam los ntawm sab nraub qaum ntsib ib lub kaum ntse ntse silicon nto, txhim kho txoj hauv kev los ntawm sab hauv (tsom teeb)
Qhov kev ntxhib los mos zoo yuav tsum ua rau qis qis dua rau tag nrho qhov pom kev yoj yoj ntev.
Hauv daim duab 6, qhov sib txawv ntawm qhov sib txawv rau lub sij hawm sib txawv sib txawv tau npaj tseg raws li kev ua haujlwm ntawm nthwv dej. Rau kev pom kev zoo nkauj, qhov loj me ntawm cov hauv paus yuav tsum yog 3-10 µm (qhov loj ntawm ntug ntawm lub hauv paus) thiab qhov npog ntawm qhov chaw yuav tsum nyob ze rau 100%.
