Abstract
Perovskite photovoltaics has emerged as a promising technology for highly efficient and low-cost solar cells. Further advances in the power conversion efficiencies are awaited by improved light harvesting concepts. One promising route to improve the current-generation in the perovskite solar cells employs nanophotonic perovskite layers. This work reports on a facile route to fabricate nanophotonic perovskite solar cells with enhanced current generation by employing thermal nanoimprint lithography. The nanoimprinted perovskite solar cells show a relative increase in power conversion efficiency by 2% with respect to their planar reference devices. The enhancement in the external quantum efficiency near the bandgap of the nanoimprinted perovskite solar cells by the coupling of the incident light to quasi-guided modes is analyzed in detail. As an outlook, the potential of the nanoimprinting route for semi-transparent perovskite solar cells is discussed via numerical simulations with relative enhancements in short-circuit current density of up to 9%. This increase is particularly promising for nanophotonic perovskite-based multi-junction solar cells.
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