ASTM_E_1021_-_15.pdf

Designation:E102115Standard Test Method forSpectral Responsivity Measurements of PhotovoltaicDevices1This standard is issued under the fixed designation E1021;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the year of last revision.A number in parentheses indicates the year of last reapproval.Asuperscript epsilon()indicates an editorial change since the last revision or reapproval.1.Scope1.1 This test method is to be used to determine either theabsolute or relative spectral responsivity response of a single-junction photovoltaic device.1.2 Because quantum efficiency is directly related to spec-tral responsivity,this test method may be used to determine thequantum efficiency of a single-junction photovoltaic device(see 10.10).1.3 This test method requires the use of a bias light.1.4 The values stated in SI units are to be regarded asstandard.No other units of measurement are included in thisstandard.1.5 This standard does not purport to address all of thesafety concerns,if any,associated with its use.It is theresponsibility of the user of this standard to establish appro-priate safety and health practices and determine the applica-bility of regulatory limitations prior to use.2.Referenced Documents2.1 ASTM Standards:2E691 Practice for Conducting an Interlaboratory Study toDetermine the Precision of a Test MethodE772 Terminology of Solar Energy ConversionE927 Specification for Solar Simulation for PhotovoltaicTestingE948 Test Method for Electrical Performance of Photovol-taic Cells Using Reference Cells Under Simulated Sun-lightE973 Test Method for Determination of the Spectral Mis-match Parameter Between a Photovoltaic Device and aPhotovoltaic Reference CellE1036 Test Methods for Electrical Performance of Noncon-centrator Terrestrial Photovoltaic Modules and ArraysUsing Reference CellsE1125 Test Method for Calibration of Primary Non-Concentrator Terrestrial Photovoltaic Reference Cells Us-ing a Tabular SpectrumE1362 Test Method for Calibration of Non-ConcentratorPhotovoltaic Secondary Reference CellsE2236 Test Methods for Measurement of Electrical Perfor-mance and Spectral Response of Nonconcentrator Multi-junction Photovoltaic Cells and ModulesG173 Tables for Reference Solar Spectral Irradiances:DirectNormal and Hemispherical on 37 Tilted Surface3.Terminology3.1 DefinitionsDefinitions of terms used in this testmethod may be found in Terminology E772.3.2 Definitions of Terms Specific to This Standard:3.2.1 chopper,na rotating blade or other device used tomodulate a light source.3.2.2 device under test(DUT),na photovoltaic device thatis subjected to a spectral responsivity measurement.3.2.3 irradiance mode calibration,na calibration methodin which the reference photodetector measures the irradianceproduced by the monochromatic beam.3.2.4 monitor photodetector,na photodetector incorpo-rated into the optical system to monitor the amount of lightreaching the device under test,enabling adjustments to bemade to accommodate varying light intensity.3.2.5 monochromatic beam,nchopped light from a mono-chromatic source reaching the reference photodetector ordevice under test.3.2.6 monochromator,nan optical device that allows aselected wavelength of light to pass while blocking otherwavelengths.3.2.7 power mode calibration,na calibration method inwhich the reference photodetector measures the power in themonochromatic beam.1This test method is under the jurisdiction of ASTM Committee E44 on Solar,Geothermal and OtherAlternative Energy Sources and is the direct responsibility ofSubcommittee E44.09 on Photovoltaic Electric Power Conversion.Current edition approved Feb.1,2015.Published April 2015.Originallyapproved in 1993.Last previous edition approved in 2012 as E1021 12.DOI:10.1520/E1021-15.2For referenced ASTM standards,visit the ASTM website,www.astm.org,orcontact ASTM Customer Service at serviceastm.org.For Annual Book of ASTMStandards volume information,refer to the standards Document Summary page onthe ASTM website.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 3.2.8 reference photodetector,na calibrated photodetectorwith a known spectral responsivity over a wavelength rangeand used to quantify the amount of light in a monochromaticbeam.3.2.9 spectral bandwidth,nthe range of wavelengths in amonochromatic light source,determined as the differencebetween its half-maximum-intensity wavelengths.3.3 Symbols:3.3.1 The following symbols and units are used in this testmethod.Ailluminated device area,m2,cspeed of light in vacuum,299792458 ms1,CVMimonitor photodetector calibration value for irradi-ance mode,Am2W1,CVMpmonitor photodetector calibration value for powermode,AW1small wavelength interval,nm or m,Eo reference total irradiance,Wm2,Eo()reference spectral irradiance,Wm2nm1orWm2m1,EMmonochromatic source irradiance,Wm2,Errfractional error in measurement,dimensionless,hPlancks constant,6.6260