We report in this letter the contactless measurement of spatially resolved photocurrent–photovoltage relationship. The method is based on hyperspectral imaging, from which we record cartography of absolute photoluminescence spectra from solar cells. Using the generalized Planck’s law, it is therefore possible to derive the quantitative value of the quasi-Fermi levels splitting, related to the voltage over the junction. It allows us to directly extract optoelectronics properties of the device with a solely optical method. As a proof of concept, we derive saturation currents of a GaAs solar cell and find a good agreement with the standard electrical measurements.
Scientific Papers
Contactless Mapping of Saturation Currents of Solar Cells by Photoluminescence
Year
2012
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Summary
Amaury Delamarre, Laurent Lombez, and Jean-François Guillemoles
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IMA™
IMA is a hyperspectral microscope delivering spectral and spatial information from 400 nm to 1620...