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High-voltage (1.8 V) 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 |
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| Authors: | S. Ito I.M. Dharmadasa J.S. Roberts H. Miura P. Pechy P. Comte |
| Affiliation: | a Department of Electrical Engineering and Computer Sciences, Graduate School of Engineering, University of Hyogo, 2167 Shosha, Himeji, Hyogo 671-2280, Japan b Materials & Engineering Research Institute, Sheffield Hallam University, Sheffield S1 1WB, UK c EPSRC National Centre for III-V Technologies, Dept. of Electronic and Electrical Engineering, University of Sheffield, Sheffield S1 3JD, UK d Tsukuba Research Center, Chemicrea Inc., Tsukuba Center Inc. D-14, 2-1-6 Sengen, Tsukuba, Ibaraki 305-0047, Japan e Laboratory for Photonics and Interfaces, Institute of Chemical Sciences and Engineering, Swiss Federal Institute of Technology, EPFL, CH-1015 Lausanne, Switzerland |
| 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. |
| Keywords: | AlGaAs/GaAs graded solar cell Dye-sensitised solar cell Tandem solar cell |
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