Publication date: 17th February 2025
With the aid of 3D full-field finite difference time-domain simulations, we propose model configurations for CsPbI3 thin film solar cell devices that include periodically arranged TiO2 microspheres, exhibiting resonating WGMs. The TiO2 microspheres present, either immersed in perovskite or coated with perovskite layer, between the electron and hole transport layers show enhanced current conversion efficiency. The presence of WGMs lead to enhancement in the absorption of CsPbI3 layer. The incoming electromagnetic wave couples with TiO2 microsphere and forms confined resonating modes. Different designs have been examined for deciding the appropriate position of WGM spheres with respect to thin-film PSC featuring back-reflector and optimized anti- reflectance coating. Since, the in-coupling element is lossless, energy stored in microspheres is absorbed efficiently by the underlying active material. This directly contributes to the increment in the current density of the solar cell. Thus, the devices show a higher current density of 23.62 mA/cm2, while that in planar solar cell device shows current density of 13.68 mA/cm2, for the same thickness of perovskite layer. This leads to more than 70 % enhancement in the short-circuit current density than the conventional PSCs device of similar size.
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