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Proceedings Paper

Characterization of solar cells using electroluminescence and photoluminescence hyperspectral images
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Paper Abstract

We analyze photoluminescence (PL) and electroluminescence (EL) using a hyperspectral imager that records spectrally resolved luminescence images of a GaAs solar cell. Thanks to the absolute calibration, we first investigate the reciprocity relations between Solar Cell and LED and determine the External Quantum Efficiency (EQE) from EL images for a specific range of voltage. Spatial variations are observed due to series resistance effect that we can evaluate. Second, the PL experiment allows us to plot the recombination current at a given spatial location versus the quasi Fermi level splitting at the same location. Indeed, under reasonable assumptions a link can be done with the classical plot of the short circuit current versus the open circuit voltage. We therefore can optically determine optoelectronic properties such as the saturation currents. The assumptions made in this experiment are discussed in order to correctly investigate polycrystalline solar cells in the future where strong lateral variations exist.

Paper Details

Date Published: 21 February 2012
PDF: 8 pages
Proc. SPIE 8256, Physics, Simulation, and Photonic Engineering of Photovoltaic Devices, 825614 (21 February 2012); doi: 10.1117/12.906859
Show Author Affiliations
A. Delamarre, Institut de Recherche et Développement sur l'Energie Photovoltaïque, CNRS, Chimie ParisTech (France)
L. Lombez, Institut de Recherche et Développement sur l'Energie Photovoltaïque, CNRS, Chimie ParisTech (France)
J. F. Guillemoles, Institut de Recherche et Développement sur l'Energie Photovoltaïque, CNRS, Chimie ParisTech (France)


Published in SPIE Proceedings Vol. 8256:
Physics, Simulation, and Photonic Engineering of Photovoltaic Devices
Alexandre Freundlich; Jean-Francois F. Guillemoles, Editor(s)

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