Energy Yield Modelling of Textured Perovskite/Silicon Tandem Photovoltaics with Thick Perovskite Top Cells
Fabrizio Gota a, Raphael Schmager a, Ahmed Farag a, Ulrich Paetzold a
a Karlsruhe Institue of Technology, Karlsruhe Institute of Technology, Institute of Nanotechnology, Hermann-von-Helmholtz-Platz 1, Eggenstein Leopoldshafen, Germany
International Conference on Hybrid and Organic Photovoltaics
Proceedings of International Conference on Hybrid and Organic Photovoltaics (HOPV22)
València, Spain, 2022 May 19th - 25th
Organizers: Pablo Docampo, Eva Unger and Elizabeth Gibson
Oral, Fabrizio Gota, presentation 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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