| Organic-inorganic lead halide perovskite solar cells are emerging as state-of-the-art photovoltaic devices because the hybrid perovskite materials potentially facilitate the photoelectric conversion so that a more than 22%power conversion efficency has been obtained.However,it is still a great challenge that how can we increase the light trapping efficiency to improve the power efficiency of perovskite solar cells.Here,we report a simple and widely applicable scheme that we incorporate soft nanoimprinted grating or quasirandom moth-eye nanostructures into electron transporting layers of perovskite solar cells as the light manipulation unit.Compared to the unpattermed device,the devices with grating and quasirandom moth-eye nanostructures exhibit a significant short circuit current enhancement of 6.6%and 11.2%respectively.At the same time,the corresponding power conversion efficiencies are increased from 14.39%to 15.36%and 16.23%,respectively.The effectiveness of this stratege is confirmed by absorption and external quantum efficiency measurements,wherein an improvement of the absorption spectrum over a broad wavelength range of 350-800 nm is observed.NWhat's more,theoretical simulations clearly exhibit that the scattering effect induced by nanostructures and the excited surface plasmon resonance(SPR)mode induced by the patterned metallic back electrode greatly enhance the energy flux densities in nanostructured layers,leading to more efficient light harvesting so as to higher power efficiency.On the other hand,we also try to control the growth of perovskite films by nanostructured templates to get the nanostructured perovskite films as well as devices.In a word,we provide different light trapping strategies which are fully compatible with solution-processed perovskite solar cells,and open up many opportunities towards the future of photovoltaic applications. |
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