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  IMAGERIE HYPERSPECTRALE...  
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À l'aide de la procédure de calibration absolue spectrale et photométrique (voir section plus bas) développée par l’IRDEP, il est possible de déterminer le nombre absolu de photons émis à partir de chaque point de la surface de l'échantillon à chaque longueur d'onde.
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Maps of a few hundreds of micrometers were obtained within minutes. With the help of the spectral and photometric absolute calibration procedure (see section below) developed by IRDEP, it is possible to determine the absolute number of photons emitted from every point of the sample at every wavelength. This unique feature allows researchers to obtain a map of the quasi-Fermi level splitting. This key parameter is of scientific importance since it is directly related to the maximum achievable voltage and saturation currents.
  MICROCELLULES CIGS  
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En alliant leur méthode breveté de calibration absolue (voir section plus bas) à la loi de Planck la généralisée, les chercheurs de l'IRDEP ont été en mesure d'extraire la séparation quasi-niveau de Fermi (Δμeff) (voir la Fig. 1
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Fig 1 (a) and (b) present PL and EL images of the CIGS microcell. By combining their spectral and photometric absolute calibration method (see section below), with the generalized Planck’s law, researchers at IRDEP were able to extract the quasi-fermi level splitting (Δμeff) (see FIG. 1 (c) and (d)) which is directly related to the maximum voltage of the cell. With the help of the reciprocity relation between solar cells and LEDs, the external quantum efficiency (EQE) can be deduced from the EL images.
  gaas  
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Avec l'aide d’une méthode brevetée de calibration absolue spectrale et photométrique (voir section plus bas) développée par l’IRDEP, il est possible de déterminer le nombre absolu de photons émis par chaque point de la surface d'un échantillon, et ce, pour chaque longueur d'onde.
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With the help of a spectral and photometric absolute calibration procedure (see section below) developed by IRDEP, it is possible to determine the absolute number of photons emitted from every point of the surface of a sample, at every wavelength. This unique feature allows researchers to obtain a map of the cell’s quasi-Fermi level splitting (Δμeff) directly from the PL images. The quasi-Fermi level splitting is of great interest since it is directly related to the maximum achievable voltage of a cell and to the saturation currents. FIG. 1 presents the obtained map of Δμeff/q [1,2]. The quasi-fermi level splitting measured is Δμeff = 1.1676 ± 0.010 eV, with a small drop near the electrical contact (vertical blue line in the middle of FIG. 1) and the external boundaries of the cell. The results being in agreement with the studies found in the literature on GaAs, researchers are now confident regarding the accuracy of the absolute calibration and hyperspectral techniques they used.
  IMAGERIE HYPERSPECTRALE...  
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Un puissance mètre est utilisé pour les mesures EL et la tension appliquée varie entre 1,05 V et 1,2 V. Un laser 532 nm (Genesis) est utilisé pour la PL (excitation de ~ 30 soleils) pour éclairer la totalité du champ de vision de l'objectif de microscope (voir section modalité d'imagerie globale plus bas).
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With this in mind Dr. Henk Bolink from the University of Valencia, in collaboration with researchers at IRDEP (Institute of Research and Development on Photovoltaic Energy, France), investigated the performance of hybrid organic–inorganic methylammonium lead iodide perovskites (CH3NH3PbI3) solar cells. CH3NH3PbI3 perovskite shows efficient photocurrent generation in addition to important photoluminescence, hence it is a great candidate for multi-functional devices [2]. In order to study the main properties of this cell, spectrally and spatially resolved photoluminescence (PL) and electroluminescence (EL) imaging was performed. To carry out such experiment, an hyperspectral imager (IMA™) with a 2 nm spectral resolution and a spatial resolution below 2 μm was used. A sourcemeter was employed for EL and the applied voltage ranged from 1.05 V to 1.2 V. A 532 nm laser (Genesis laser) was used for PL (excitation of ~30 suns) to illuminate the entire field of view under the microscope objective and the PL signal coming from millions of points was collected simultaneously (see global imaging modality section below for more details).