5 June 2015 Quantitative optical measurement of chemical potentials in intermediate band solar cells
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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.
© 2015 Society of Photo-Optical Instrumentation Engineers (SPIE)
Pierre Rale, Pierre Rale, Amaury Delamarre, Amaury Delamarre, Gilbert El-Hajje, Gilbert El-Hajje, Ryo Tamaki, Ryo Tamaki, Kentaroh Watanabe, Kentaroh Watanabe, Yasushi Shoji, Yasushi Shoji, Yoshitaka Okada, Yoshitaka Okada, Masakazu Sugiyama, Masakazu Sugiyama, Laurent Lombez, Laurent Lombez, Jean-François Guillemoles, 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 . Submission:
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