Optoelectronic simulation and optimization of unconstrained four terminal amorphous silicon/crystalline silicon tandem solar cell (original) (raw)
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Optical modelling of tandem structure amorphous silicon solar cells
Journal of Non-Crystalline Solids, 1998
Using the admittance analysis method, the design of a tandem of two cells stacked one on the top of the other and connected in series is modelled. The i-layer of the top cell is assumed to be made of a-Si:H and that of the bottom cell of a-SiGe:H, and the condition of current matching at maximum power point is applied to determine the tandem's optimal design. The eect of defects as recombination centres is also incorporated in the calculation of the voltage±current dependencies.
Solar Energy Materials and Solar Cells, 2010
In this paper, single and multi-junction solar cells based on hydrogenated amorphous silicon (a-Si:H) and its alloy amorphous silicon carbide (a-SiC:H) are analyzed using one dimensional simulator AMPS-1D (Analysis of Microelectronic and Photonic Structures). Effects of thickness and doping concentration of different layers as well as the operating temperature on cell efficiency have been investigated with a view to find a more efficient and stable cell. For the single junction cell, the maximum efficiency of 19.62% has been achieved for a thickness of 500 nm of i-layer, which further improved to 20.8% after the optimization of the doping concentration. In case of double junction cell, the highest efficiency of 20.19% was found for top i-layer thickness of 700 nm after optimizing the bottom cell parameters. For the triple junction cell, parameters of the bottom cell and middle cell were optimized and the maximum efficiency of 21.89% was found with the top i-layer thickness of 600 nm. As regards the operating temperature, the double junction and the triple junction tandem cells showed better stability, with temperature gradient of 0.17% and 0.18%/C, respectively, than the single junction cell of 0.23%/C. The overall investigation on amorphous silicon solar cells as done here gives potential parametric suggestion that may lead to the fabrication of the high efficiency and stabilized a-Si thin film solar cells.
Analysis of high efficiency amorphous silicon single and multijunction solar cells
2009 1st International Conference on the Developements in Renewable Energy Technology (ICDRET), 2009
Amorphous silicon (a-Si) is widely used as material for photovoltaic because of its properties. In this work, the models of amorphous Si based solar cells are single junction with a-SiC:H/a-Si:H/ a-Si:H structure, double junction with a-SiC:H/ a-Si:H/ a-Si:H/¿c-SiC:H/ ¿c-SiC:H/ ¿c-SiC:H and multi junction a-SiC:H/a-Si:H/ a-Si:H /a-SiC:H/ a-Si:H/ a-Si:H/ a-SiC:H/ ¿c-SiC:H /a-Si:H. This structure will be designed and analyzed by using