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Journal of Photonics for Energy

Quantitative optical measurement of chemical potentials in intermediate band solar cells
Author(s): Pierre Rale; Amaury Delamarre; Gilbert El-Hajje; Ryo Tamaki; Kentaroh Watanabe; Yasushi Shoji; Yoshitaka Okada; Masakazu Sugiyama; Laurent Lombez; Jean-François Guillemoles
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Paper Abstract

Having shown some demonstration of two photon absorption and multiband emission processes in quantum dots (QD), multiquantum wells (MQW), and highly mismatched alloys, intermediate band solar cells are currently the subject of numerous studies. To better understand the underlying mechanisms, our objective is to experimentally probe the multiband operation of this device. We used photoluminescence recorded with a calibrated hyperspectral imager which provides spectrally resolved images with a spatial resolution of 2  μm and spectral resolution of 2 nm on proof of concept QD and MQW solar cells samples. Device emission can be described with the generalized Planck’s law from which the quasi-Fermi level splitting of the three bands can be determined. The advantage of the technique is that it can be used to investigate the intermediate band material without the need to make contacts or a full device structure. We also discuss the usefulness of a dual-beam method.

Paper Details

Date Published: 5 June 2015
PDF: 10 pages
J. Photon. Energy. 5(1) 053092 doi: 10.1117/1.JPE.5.053092
Published in: Journal of Photonics for Energy Volume 5, Issue 1
Show Author Affiliations
Pierre Rale, Institut de Recherche et Développement sur l'Energie Photovoltaïque (France)
Amaury Delamarre, Institut de Recherche et Développement sur l'Energie Photovoltaïque (France)
The Univ. of Tokyo (Japan)
Gilbert El-Hajje, Institut de Recherche et Développement sur l'Energie Photovoltaïque (France)
Ryo Tamaki, The Univ. of Tokyo (Japan)
Kentaroh Watanabe, The Univ. of Tokyo (Japan)
Yasushi Shoji, The Univ. of Tokyo (Japan)
Yoshitaka Okada, The Univ. of Tokyo (Japan)
Masakazu Sugiyama, The Univ. of Tokyo (Japan)
Laurent Lombez, Institut de Recherche et Développement sur l'Energie Photovoltaïque (France)
Jean-François Guillemoles, Institut de Recherche et Développement sur l'Energie Photovoltaïque (France)
The Univ. of Tokyo (Japan)


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