Silicon wafers thiab silicon solar cells yog cov neeg sawv cev ntawm cov khoom siv semiconductor thiab cov khoom siv semiconductor, feem. Cov yam ntxwv ntawm semiconductor ntsuas thiab ntsuas qhov ua tau zoo ntawm cov khoom siv thiab lawv cov khoom siv. Vim qhov tseeb tias cov khoom thauj khoom thauj yog cov khoom siv ua haujlwm ntawm cov khoom siv hluav taws xob thiab cov khoom siv, lawv lub zog tsim cov dej ntws thiab hluav taws xob. Nyob rau tib lub sijhawm, cov khoom thauj khoom muaj cov yam ntxwv xws li luminescence thiab thermal tawg. Yog li ntawd, tus nqi thauj khoom tsis yog lub hauv paus rau kev coj tus yam ntxwv ntawm cov khoom thauj khoom thauj hauv cov khoom siv hluav taws xob thiab cov khoom siv, thiab yog ib qho tseem ceeb ntawm cov yam ntxwv ntawm silicon wafers thiab silicon solar cells. Thaum silicon wafers tau ua tiav thiab tsim los ua silicon hnub ci hlwb, qhov sib txawv ntawm pn hlws ris thiab Fermi theem ua rau cov cab kuj sib cais thiab voltage tsim, uas nyob rau hauv lem qhia thiab cuam tshuam cov volt ampere yam ntxwv ntawm lub hnub ci hlwb los ntawm hluav taws xob kev ua tau zoo tsis xws li saturation tam sim no, sau qhov tseem ceeb, thiab photoelectric conversion efficiency. Raws li kev txheeb xyuas saum toj no, cov yam ntxwv tseem ceeb ntawm silicon wafers suav nrog cov khoom thauj khoom.
Cov neeg nqa khoom tau muab faib ua feem ntau cov neeg nqa khoom thiab cov neeg nqa khoom tsawg, suav nrog cov khoom siv hluav taws xob thiab qhov. Lub diffusion thiab drift ntawm tus nqi thauj khoom tsim lub hauv paus rau kev sib kis tam sim no hauv cov khoom siv semiconductor. Carrier transport parameters yog cov tsis yooj yim uas piav qhia txog kev txav mus los thiab kev xav ntawm cov neeg nqa khoom, feem ntau suav nrog cov neeg nqa khoom lub neej, diffusion coefficient, thiab sab pem hauv ntej thiab sab nraub qaum. Cov kev txwv no ncaj qha cuam tshuam txog lub cev thiab hluav taws xob cov khoom ntawm cov khoom siv semiconductor, cuam tshuam rau cov khoom thauj thiab kev txav mus los; Doping concentration yog lwm qhov tseem ceeb uas txiav txim siab cov cab kuj concentration, cuam tshuam rau cov khoom tsis zoo xws li cov khoom siv tiv taus thiab lub neej ua haujlwm, thiab txiav txim siab kev ua haujlwm ntawm cov khoom siv.
Carrier Concentration
Feem ntau cov khoom siv semiconductor yog cov neeg nqa khoom tsawg, xws li silicon solar cells. Cov cab kuj tsis tau hais tom qab hauv kab lus no yog tag nrho cov neeg nqa khoom tsawg. Nyob rau hauv lub xeev ntawm thermal equilibrium, semiconductors muaj qhov sib npaug ntawm qhov sib npaug ntawm qhov thiab electrons, thiab nyob rau hauv ib qho chaw ruaj khov; Thaum raug rau sab nraud stimuli (xws li lub teeb, hluav taws xob, tshav kub, thiab lwm yam), semiconductors nyob rau hauv ib tug tsis muaj -equilibrium lub xeev, nrog rau ib tug nce nyob rau hauv ob qho tib si electrons thiab qhov, ua ntau tshaj cov cab kuj. Lub neej ntawm tus nqi thauj khoom yog hais txog lub sijhawm nruab nrab ntawm qhov muaj nyob ntawm cov neeg nqa khoom tshaj, thiab qhov concentration ntawm cov cab kuj ua raws li txoj cai exponential decay.
Carrier Lub Neej
Cov neeg nqa khoom lub neej tuaj yeem muab faib ua hluav taws xob recombination lifetime, Auger recombination lifetime, thiab Shockley Read Hall (SRH) recombination lifetime raws li hom carrier recombination. Tus neeg nqa khoom lub neej yog qhov tseem ceeb ntawm qhov tsis txaus ntseeg ntawm cov khoom siv thiab cov khoom siv, nrog rau qhov ntsuas tseem ceeb rau kev ntsuas cov cuab yeej hloov pauv ceev, qhov nce tam sim no, qhov hluav taws xob, thiab lwm yam ntxwv. Nws kuj tseem ua lub luag haujlwm tseem ceeb hauv electro- optical thiab photoconversion efficiency ntawm optoelectronic li xws li semiconductor lasers, photodetectors, thiab solar cells.
Surface Recombination Rate
Cov neeg nqa khoom sib txuas ob sab hauv thiab ntawm qhov chaw ntawm cov khoom. Surface recombination velocity (s) yog lub cev kom muaj nuj nqis uas piav qhia txog qhov ceev ntawm cov neeg nqa khoom thauj rov qab rau ntawm qhov chaw. Qhov ntev ntawm qhov sib xyaw ntawm lub neej, qhov qis ntawm qhov sib xyaw ntawm qhov sib txawv, thiab qhov sib txawv, qhov siab dua qhov sib xyaw ntawm qhov chaw. Deg roughness, deg dangling bonds, thiab lwm yam saum npoo ntawm lub cev thiab lub xeev yog cov tseem ceeb cuam tshuam rau saum npoo recombination tus nqi. Qhov saum npoo recombination tus nqi yog qhov tseem ceeb ntawm kev ua tau zoo uas ua rau cov khoom zoo ntawm cov khoom.
Muaj txiaj ntsig Lifespan
Lub neej ua haujlwm tau zoo yog ib qho kev sib txuas ua ke ntawm lub neej ntev thiab kev sib txuas ntawm lub neej, thiab yog tus cwj pwm ntawm tag nrho cov neeg nqa khoom lub neej ntawm ib qho qauv tshwj xeeb. Tam sim no, feem ntau cov thev naus laus zis tshawb pom pom cov neeg nqa khoom lub neej raws li lub neej muaj txiaj ntsig zoo, uas tsis tuaj yeem cais lub neej ntev thiab qhov sib xyaw ua ke. Yog li ntawd, nws yog ib qho nyuaj rau kev txheeb xyuas qhov cuam tshuam ntawm cov txheej txheem kho saum npoo, qhov tsis xws luag, thiab doping ntawm kev ua haujlwm ntawm silicon wafers thiab hnub ci hlwb ib los ntawm ib qho.
Diffusion Coefficient
Lub diffusion coefficient (D) yog lub cev kom muaj nuj nqis uas qhia qhov ceev ntawm cov neeg nqa khoom thauj mus los ntawm kev sib cuam tshuam hauv ib lub sijhawm thiab thaj chaw. Lub diffusion coefficient thiab tus neeg nqa khoom lub neej ua ke txiav txim siab qhov ntev ntawm cov cab kuj, uas yog qhov ntsuas tsis zoo rau kev ntsuas cov khoom siv. Qhov ntev ntawm cov cab kuj diffusion ntev, qhov zoo ntawm cov khoom zoo; Rau lub hnub ci hlwb, qhov ntev ntawm cov cab kuj diffusion ntev, qhov zoo dua cov cab kuj sib cais thiab sau efficiency, thiab ntau dua qhov kev hloov dua siab tshiab ntawm photoelectric.
Doping
Doping: Ib kauj ruam tseem ceeb hauv Semiconductor Manufacturing
Doping yog ib kauj ruam tsim nyog hauv kev tsim cov khoom siv semiconductors, thiab doping concentration muaj qhov cuam tshuam loj rau kev tiv thaiv thiab kev thauj mus los tsis zoo. Intrinsic semiconductors, piv txwv li undoped semiconductors, muaj hluav taws xob siab heev nyob rau hauv chav tsev kub. Raws li cov doping concentration nce, cov hluav taws xob resistivity txo, thiab cov cab kuj lub neej thiab diffusion ntev maj mam txo.
