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arXiv · 2008.13696

Perovskite/silicon tandem solar cells: Effect of luminescent coupling and bifaciality

Klaus Jäger·Peter Tillmann·Eugene A. Katz·Christiane Becker
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Abstract

The power conversion efficiency of the market-dominating silicon photovoltaics approaches its theoretical limit. Bifacial solar operation with harvesting additional light impinging on the module back and the perovskite/silicon tandem device architecture are among the most promising approaches for further increasing the energy yield from a limited area. Here, we calculate the energy output of perovskite/silicon tandem solar cells in monofacial and bifacial operation considering, for the first time, luminescent coupling between two sub-cells. For energy yield calculations we study idealized solar cells at both, standard testing as well as realistic weather conditions in combination with a detailed illumination model for periodic solar panel arrays. Considering typical, experimental photoluminescent quantum yield values we find that more than 50% of excess electron-hole pairs in the perovskite top cell can be utilized by the silicon bottom cell by means of luminescent coupling. As a result, luminescent coupling strongly relaxes the constraints on the top-cell bandgap in monolithic tandem devices. In combination with bifacial operation, the optimum perovskite bandgap shifts from 1.71 eV to the range 1.60-1.65 eV where already high-quality perovskite materials exist. The results can hence change a paradigm in developing the optimum perovskite material for tandem solar cells.

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Klaus Jäger, Peter Tillmann, Eugene A. Katz, Christiane Becker. 2020-08-31. Perovskite/silicon tandem solar cells: Effect of luminescent coupling and bifaciality. https://doi.org/10.1002/solr.202000628

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