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Solar Cell Short Circuit Current Errors and Uncertainties During High Altitude CalibrationsHigh altitude balloon based facilities can make solar cell calibration measurements above 99.5% of the atmosphere to use for adjusting laboratory solar simulators. While close to on-orbit illumination, the small attenuation to the spectra may result in under measurements of solar cell parameters. Variations of stratospheric weather, may produce flight-to-flight measurement variations. To support the NSCAP effort, this work quantifies some of the effects on solar cell short circuit current (Isc) measurements on triple junction sub-cells. This work looks at several types of high altitude methods, direct high altitude meas urements near 120 kft, and lower stratospheric Langley plots from aircraft. It also looks at Langley extrapolation from altitudes above most of the ozone, for potential small balloon payloads. A convolution of the sub-cell spectral response with the standard solar spectrum modified by several absorption processes is used to determine the relative change from AMO, lscllsc(AMO). Rayleigh scattering, molecular scatterin g from uniformly mixed gases, Ozone, and water vapor, are included in this analysis. A range of atmosph eric pressures are examined, from 0. 05 to 0.25 Atm to cover the range of atmospheric altitudes where solar cell calibrations a reperformed. Generally these errors and uncertainties are less than 0.2%
Document ID
20150009917
Acquisition Source
Glenn Research Center
Document Type
Conference Paper
Authors
Snyder, David D. (NASA Glenn Research Center Cleveland, OH, United States)
Date Acquired
June 5, 2015
Publication Date
June 3, 2012
Subject Category
Energy Production And Conversion
Report/Patent Number
E-664099
Meeting Information
Meeting: IEEE Photovoltaic Specialists Conference
Location: Austin, TX
Country: United States
Start Date: June 3, 2012
End Date: June 8, 2012
Sponsors: Institute of Electrical and Electronics Engineers
Funding Number(s)
WBS: WBS 717302.04.03.01.03
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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