High-voltage (1.8V) tandem solar cell system using a GaAs/AlXGa(1−X)As graded solar cell and dye-sensitised solar cells with organic dyes having different absorption spectra

ITO, S., DHARMADASA, I.M., TOLAN, G.J., ROBERTS, J.S., HILL, G., MIURA, H., YUM, J.-H., PECHY, P., LISKA, P., COMTE, P. and GRÄTZEL, M. (2011). High-voltage (1.8V) tandem solar cell system using a GaAs/AlXGa(1−X)As graded solar cell and dye-sensitised solar cells with organic dyes having different absorption spectra. Solar Energy, 85 (6), 1220-1225.

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Link to published version:: 10.1016/j.solener.2011.02.024

Abstract

Stacked multijunction (tandem) solar cells have been prepared by mechanically stacking dye-sensitised solar cells (DSCs) and a GaAs/AlXGa(1−X)As graded solar cell (GGC) as the top and bottom cells, respectively. Three organic dyes with different absorption spectra (D131, D102 and D205) were used in the DSCs, in order to match the photocurrent density between the DSC and the GGC. Tuning the absorption range of the DSC by choosing an appropriate dye, increased the overall photovoltaic conversion efficiency due to the optimal utilisation of the solar spectrum in the individual cells. The open circuit photovoltages (VOC) of the GGC and the DSC with D131 were 1.11 V and 0.76 V, respectively, resulting in a VOC of 1.85 V and a photovoltaic conversion efficiency of 7.63% for the tandem cell. Although the overall conversion efficiency has not exceeded that of the GGC (7.66%), these tandem cells provide adequate VOC values for water splitting applications.

Item Type: Article
Research Institute, Centre or Group: Materials and Engineering Research Institute > Thin Films Research Centre > Electronic Materials and Sensors Research Group
Identification Number: 10.1016/j.solener.2011.02.024
Depositing User: Helen Garner
Date Deposited: 19 Dec 2011 12:28
Last Modified: 19 Dec 2011 12:28
URI: http://shura.shu.ac.uk/id/eprint/4209

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