Proceedings of MATSUS Spring 2024 Conference (MATSUS24)
DOI: https://doi.org/10.29363/nanoge.matsus.2024.129
Publication date: 18th December 2023
Tandem technology is the most promising route to further enhance the power conversion efficiency of solar cells. In recent years perovskite/silicon tandem solar cells have demonstrated an unprecedented rise of efficiencies far beyond the silicon single-junction efficiency limit. Further, all-perovskite multijunction solar cells gained increasing interest due to its compatibility with a fully printable, flexible, and lightweight technology platform.
In this contribution, optical aspects of perovskite tandem solar cells are discussed. This comprises 1) “classical” light management issues such as the minimization of reflection losses and the improvement of light trapping in thin absorber layers for the full spectral range. To achieve this, usually nano- and or micro-textures are implemented into the device coming along with special technological challenges concerning the compatibility of the textures with the respective perovskite deposition method. Further, we discuss 2) current-matching constraints in monolithic perovskite tandem devices. While under standard texting conditions there is little tolerance concerning the engineering of the perovskite bandgap(s), there is evidence that outdoor weather conditions, bifacial illumination as well as luminescent coupling can strongly relax current-matching constraints. Finally, we will give an outline how 3) optical engineering of luminescence and re-absorption processes can not only influence the short-circuit current density but also the electronic performance of the tandem solar cell device.
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