Concentrator photovoltaic usually embeds multi-junction solar cells, which exhibit high spectral sensitivity due to the internal series connection of the sub-cells. The use of so-called isotype or component cells with the same spectral response as the corresponding sub-cell, is widely applied for characterizing the spectral content of the impinging irradiance. These isotype sensors can be substituted by the multi-junction cells themselves, which are inherently spectrally tuned to any evolution of the multi-junction technology. To convert a multi-junction cell in a spectral sensor, it is necessary to add bias light within the spectral response of all but one of the sub-cells to saturate the corresponding junctions, so the non-saturated limits the current under any specified impinging spectrum. This paper shows indoor and outdoor side-by-side comparison of the so-called pseudo isotypes, based on a triple-junction solar cell, and genuine isotypes. The conditions to ensure an accurate spectral response, particularly for the bottom pseudo-isotype, are presented and discussed.
From component to multi-junction solar cells for spectral monitoring
Norman Jost, Ignacio Antón, Rubén Nuñez, Stephen Askins, Luis J. San José, Guido Vallerotto, Rebeca Herrero, Marta Victoria, César Domínguez, Gabriel Sala; From component to multi-junction solar cells for spectral monitoring. AIP Conf. Proc. 13 September 2018; 2012 (1): 100002. https://doi.org/10.1063/1.5053546
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