Measurement of the open circuit voltage of individual sub-cells in a dual-junction solar cell

0380508 - FZÚ 2013 US eng J - Journal Article
Holovský, Jakub - Bonnet-Eymard, M. - Bugnon, G. - Cuony, P. - Despeisse, M. - Ballif, C.
Measurement of the open circuit voltage of individual sub-cells in a dual-junction solar cell.
IEEE Journal of Photovoltaics. Roč. 2, č. 2 (2012), s. 164-168. ISSN 2156-3381. E-ISSN 2156-3403
R&D Projects: GA MŠMT(CZ) 7E09057
EU Projects: European Commission(XE) 214134 - N2P
Institutional research plan: CEZ:AV0Z10100521
Keywords : current-voltage characteristics * photovoltaic cells * solar energy
Subject RIV: BM - Solid Matter Physics ; Magnetism
http://ieeexplore.ieee.org/lpdocs/epic03/wrapper.htm?arnumber=6150992

This work presents a new technique to measure the open circuit voltage (VOC) of each individual sub-cell of a dual-junction device with a method that circumvents the need for completely selective illumination. The method is based on the description of the total device VOC as a function of two independent variables determined by two distinct illumination spectra. Without completely selective illumination, one can measure only a limited range of this function; however, an unambiguous extension gives values corresponding to the conditions of ideal selectivity, which correspond in turn to the VOC of the individual sub-cells at 1 sun illumination. This method does not rely on any specific electrical or optical model of solar cell. Method is successfully tested with a simple measurement set-up based on commercially available luminescence diodes and voltmeters in combination with specially prepared three terminal dual-junction thin-film silicon solar cells.
Permanent Link: http://hdl.handle.net/11104/0211199