Solar cell efficiency measurements

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1、SolarCells,17(1986)253-274253SOLARCELLEFFICIENCYMEASUREMENTSK.A.EMERYandC.R.OSTERWALDSolarEnergyResearchInstitute,1617ColeBlvd.,Golden,CO80401(U.S.A.)(ReceivedAugust2,1985;acceptedAugust2,1985)SummaryThecalibrationandefficiencymeasurementproceduresfollowedbythePVDe

2、vicesandMeasurementsBranchattheSolarEnergyResearchInstitute(SERI)arepresented.Theuseofspectralirradiancemeasurementstocali-bratereferencecellsusedinthesemeasurementshasreducedtheuncertaintyinthecalibrationnumbertolessthan1%.Theuseofthespectralmismatchindexcanreduce

3、theerrorsinshort-circuitcurrentmeasurementstoabout2%forawidevarietyoftestcell/referencecellcombinationsandreducetheneedforaclosematchbetweenthetestcellandreferencecellspectralresponsesorthesourcespectrumandstandardspectrum.TheeffectofvariousspectrainusebythePVcommu

4、nityontheshort-circuitcurrentispresentedforavarietyofcellspectralresponses.1.IntroductionTheneedformeaningfulperformancecomparisonsofdifferentphoto-voltaic(PV)deviceshasgivenrisetoefficiencymeasurementsperformedunderstandardsolarspectralirradianceandtestconditions.

5、Thephotovoltaicconversionefficiency,whichisdeterminedfromthecurrentversusvoltage(I-V)characteristicsofanilluminatedcell,istypicallymeasuredwithrespecttoastandardsolarspectrumatagivenintensity(100mWcm-2).SeveraldifferentstandardspectraareinusebythePVcommunity[1-6].T

6、hesespectrarepresentdirectnormal[1,2,4,5]andglobalirradiation[3,5,6]underdifferentatmosphericconditions.SeveralinvestigatorshaveproposedmeasuringthePVperformanceoveraperiodoftimeandreportinganenergyratingbasedonalargenumberofmeasurements[7].Althoughtheseenergyratin

7、gmethodsdonotprovideinformationontheefficiencywithrespecttoastandardsolarspectrum,theydoprovideinformationonthefieldperformanceoverextendedtimeperiodsundervaryingsitespecificsolarinsolationconditions.Thisreportwilldiscusstheissuesassociated0379-6787/86/$3.50©Elsevi

8、erSequoia/PrintedinTheNetherlands254withmeasuringtheefficiencywithrespecttoastandardsolarspectrumunderstandardtestconditions,andthespecificproced