Proceedings of International Conference on Hybrid and Organic Photovoltaics (HOPV22)
DOI: https://doi.org/10.29363/nanoge.hopv.2022.050
Publication date: 20th April 2022
Solution processing of micrometer-thick perovskite solar cells over textured silicon bottom solar cells allowed recently a new promising approach for the fabrication of 2T perovskite/silicon tandem solar cells, combining optimal light management in the textured bottom cell with the ease of top cell solution processing. To assess the performances of this morphology configuration (thick perovskite configuration), which recently reached power convesion efficiencies as high as 28.2% [1], and compare it with the other two relevant morphology configurations, i.e. the planar and conformal perovskite configuration, detailed simulations are needed. In this work, optical and energy yield (EY) simulations are performed with the in-house developed EYcalc software [2] to compare the three morphology configurations for 2T perovskite/silicon tandem solar cells. Under standard test conditions, the total photogenerated current of the thick perovskite configuration is 1.3 mA cm-2 lower (-3.4% relative) than the one of the conformal perovskite on textured silicon configuration for non-encapsulated cells and only 0.8 mA cm-2 (-2.1% relative) for encapsulated cells. Under realistic outdoor conditions, EY modelling for a wide range of locations shows that, while conformal perovskite on textured silicon configuration remains the optimal configuration, thick perovskite configuration exhibits a mere ~2.5% lower annual EY. Finally, intermediate scenarios are investigated, where the angle of the perovskite front-side texture (θp) differs from the silicon texture (θsilicon = 54.74°). This scenario can be reached by solution processing of the perovskite layer, which can then present partial conformality to the underlying silicon textures, as alredy shown experimentally [3]. Under standard test conditions, critical θp angles are identified for both encapsulated and non-encapsulated cells, which significatly improve light management. Instead, under realistic irradiation conditions, the energy yield increases gradually with increasing perovskite conformality. However, already with θp = 24°, the EY is 99.2% of the EY for the conformal perovskite configuration, suggesting that solution processing of thick perovskite layers allows optical and EY performances very close to the optically ideal conformal perovskite case.
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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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