5 June 2015 Quantitative optical measurement of chemical potentials in intermediate band solar cells
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J. of Photonics for Energy, 5(1), 053092 (2015). doi:10.1117/1.JPE.5.053092
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.
© 2015 Society of Photo-Optical Instrumentation Engineers (SPIE)
Pierre Rale, Amaury Delamarre, Gilbert El-Hajje, Ryo Tamaki, Kentaroh Watanabe, Yasushi Shoji, Yoshitaka Okada, Masakazu Sugiyama, Laurent Lombez, Jean-François Guillemoles, "Quantitative optical measurement of chemical potentials in intermediate band solar cells," Journal of Photonics for Energy 5(1), 053092 (5 June 2015). https://doi.org/10.1117/1.JPE.5.053092

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