Proceedings of 6th International Conference on Hybrid and Organic Photovoltaics (HOPV14)
Publication date: 1st March 2014
Complementary absorption, high absorption coefficients, and the ease of fabrication make organic low band gap materials suitable for the use in multi-junction solar cells in combination with amorphous silicon (a-Si:H). We present efficient triple junction solar cells incorporating an organic Si-PCPDTBT/PC70BM bulk heterojunction sub-cell connected in series with two a-Si:H junctions. In our device design, expensive ITO is replaced by Al:ZnO as the transparent conductive oxide. The recombination contact between the a-Si:H and organic sub-cells is made from Al:ZnO covered with ultrathin Ag and MoO3. This optimized device architecture results in a very high open circuit voltage of 2.3V, which is close to the sum of all sub-cell open circuit voltages. Also, high fill factors of over 70% are reached, indicating efficient recombination contacts. The opportunity of applying light trapping and the development of new low band gap donor polymers with high quantum efficiency in the NIR renders these hybrid triple junctions highly suited for efficient light harvesting.
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International Conference on Hybrid and Organic Photovoltaics
International Conference on Hybrid and Organic Photovoltaics (HOPV) is celebrated yearly in May. The main topics are the development, function and modeling of materials and devices for hybrid and organic solar cells. The field is now dominated by perovskite solar cells but also other hybrid technologies, as organic solar cells, quantum dot solar cells, and dye-sensitized solar cells and their integration into devices for photoelectrochemical solar fuel production.
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