optical-properties-of-hnub ci-cell-khoom
Cov khoom siv kho qhov muag ntawm lub hnub ci feem ntau txiav txim siab qhov kev ua tiav qhov kawg ntawm hnub ci lub hlwb thiab yog lub hauv paus rau tus txheej txheem tsim.
(1) Txoj Cai Kev Tso Cai
Thaum ib qho nqaj ntawm spectral irradiance I0 yog qhov teeb meem ntawm qhov chaw ntawm lub semiconductor, tom qab rho qhov kev xav, lub spectral irradiance mus rau lub semiconductor yog I0 (1-R), thiab qhov nrug ntawm sab xub ntiag yog x ntawm lub semiconductor. Lub spectral irradiance Ix yog txiav txim los ntawm txoj cai ntawm kev nqus: thaum lub thickness ntawm lub lamella yog d, peb yuav tau txais ib qho ntau dua approximation ntawm lub transmittance.
Kev sib raug zoo ntawm kev haum coefficient thiab wavelength ntawm ib leeg siv lead ua silicon, gallium arsenide thiab qee cov khoom tseem ceeb hauv lub cell solar
(2) Lub cev nqus dej (intrinsic absorption)
Hauv atomic dluab, intrinsic absorption ntawm silicon yuav to taub raws li qhov tseeb tias silicon atom yog siab los ntawm ib photon, ua rau ib tug electronically nqi ua ib tug dawb electron thaum tawm hauv lub qhov nyob rau hauv lub cov nyiaj cog covalent. Kev sim tau pom tias tsuas yog cov photons uas nws hu loj tshaj qhov txwv tsis pub lub dav hlau uas txwv tsis pub muaj xws li ua rau lub cev tsis haum.
Obviously, qhov teeb meem photon yuav tsum los siav lossis qhov zaus ntawm lub teeb uas Vo- tuaj yeem tsim qhov nqus dej (qhov tsis txaus siab); Hlais - tsuas yog qhov wavelength ntawm qhov kev yoojyim ntawm lub teeb (lub tshav puam tsis txaus siab).
Nws ntseeg hais tias silicon yog pob tshab rau cov teeb ci duab liab qab muaj ib lub qhov ntev tshaj 1.15 μm.
Hnub ci hluav taws xob sib npaug, hluav taws xob tawm thiab sau tau
(1) sib npaug zos
Yuav kom piav qhia txog kev khiav haujlwm ntawm lub roj teeb, lub roj teeb thiab kev thauj khoom muaj feem ntau simulated nrog ib qho kev sib npaug.
1. Qhov tam sim no qhov tam sim no: Nyob hauv qhov chaw tsis muaj teeb meem, lub hnub ci hauv kev ua hauj lwm hauv lub xeev tsis hloov nws cov ntawv luam tawm nrog lub xeev ua haujlwm. Nws tuaj yeem raug suav ua qhov tam sim no qhov tam sim no hauv lub vaj huam sib luag.
2. Tsaus ntuj tam sim no Ibkawm: Ib feem ntawm lub photocurrent ntws los ntawm RL load, thiab lub davhlau ya nyob twg ntawm qhov davhlau ya nyob twg U yog tsim muaj thoob plaws hauv lub nkoj. Nyeg, nws yog nce mus rau PN hlawv, ua rau lub sijhawm tsaus ntuj nti rov rau cov lus qhia ntawm lub photocurrent.
3. Nyob rau hauv no txoj kev, qhov sib npaug ntawm ib lub PN homojunction zoo ib yam ntawm lub hnub ci ntawm lub cev.
4. Daim Ntawv Roj Tawm Raus Tes (RS Series): Vim kev sib cuag ntawm lub hauv ntej thiab sab nraum cov electrodes, thiab cov khoom siv nws tus kheej muaj peev xwm tiv thaiv tau, nws tsis muaj peev xwm ua kom paub ntau ntxiv hauv cov hauv paus thiab txheej saum toj. Thaum lub sij hawm tam sim no ntws los ntawm kev thauj mus dhau los ntawm lawv, nws yuav tsis ua rau poob. Hauv qhov sib npaug sib npaug, lawv cov nyhuv tag nrho tuaj yeem sawv cev tau los ntawm RS kev tawm tsam.
5. Kev Tig Taug Kev Tshaj Tawm RSH: Vim tias cov xim ntawm ntug kev thiab cov hlau txuas mus rau ntawm cov kauj vab hlau, khawb, thiab lwm yam khoom thaum tsim lub tshuab hluav taws xob, ib feem ntawm qhov tam sim no uas yuav tsum tau los ntawm kev tsav tsheb yog luv- circuited. RSH resistor yog sib npaug.
Thaum twg tam sim no ntws mus rau hauv qhov RL load kuv thiab lub davhlau ya nyob twg ntawm qhov RL load U, nws tau:
P hauv cov mis yog qhov tso zis tau ntawm lub RL load thaum lub hnub ci cell yog irradiated.
(2) Lub zog tawm
Thaum twg tam sim no ntws mus rau hauv qhov RL load kuv thiab qhov dav hlau voltage ntawm lub RL load U, nws tuaj yeem tau txais tau tias P hauv qhov formula yog qhov tso tawm tau ntawm qhov RL thaum lub hnub ci ntawm lub cev yog irradiated.
Thaum twg tus load RL hloov ntawm 0 rau infinity, cov zis voltage U hloov ntawm 0 rau U0C, thiab cov kev hloov ntawm tam sim no hloov ntawm ISC rau 0, li no yog nqus ib tus cwj pwm kev ntsim ntawm lub hnub ci ntawm tes. Txhua tus taw tes ntawm qhov nkhaus hu ua qhov chaw ua haujlwm. Qhov chaw ua hauj lwm thiab lub hauv paus chiv keeb yog hu ua load lines. Qhov sib thooj ntawm txoj kab nqes ntawm txoj kab npauj kab yog sib npaug zos rau RL. Lub plhaw thiab txoj kab sib dhos sib npaug los ua haujlwm ua haujlwm yog qhov ua haujlwm ua haujlwm thiab ua haujlwm tam sim no.
Thaum kho qhov kev ntsuas ua haujlwm RL mus rau ib qho nqi Rm, tus taw tes M yog tau ntawm qhov nkhaus, thiab qhov khoom ntawm qhov sib txawv ua hauj lwm tam sim no Im thiab qhov ua hauj lwm qhov sib xws Um yog qhov loj, uas yog: Pm = ImUm
Feem ntau, qhov M point yog qhov pom kev ua haujlwm (lossis qhov siab tshaj plaws ntawm lub hwjchim) ntawm lub hnub ci, Kuv tabtom ua haujlwm ua haujlwm tam sim no, Um yog qhov ua haujlwm ua haujlwm zoo, Rm yog kev pom kev ua haujlwm, thiab Pm yog lub zog siab tshaj plaws.
(3) Ua kom tiav
1. Qhov sib txawv ntawm qhov tso zis ntau tshaj plaws rau (Uoc × Isc) yog hu ua qhov kev ua tiav (FF), uas yog ib qho tseem ceeb ntsuas los ntsuas cov yam ntxwv ntawm lub hnub ci.
2. Kev txheeb xyuas qhov ua tau zoo yog qhov zoo thiab qhov tsis zoo ntawm lub hnub ci. Nyob hauv qee lub spectral irradiance, qhov loj dua ntawm FF, qhov ntau "square" tus nkhaus thiab siab zog tso zis.